E-mail Rojett engines

[Osni Renato]

Hi friends !
I need contact to Ro Jett engines
this email does not work jett2008@jettengineering.com
already sent messages without a reply
Have other mail to contact (Ro Jett engines) ?

Thank´s
Regard´s

[Greg L Bahrman]

Here ya go !!!!
jettengr@sbcglobal.net

Greg B.

[Osni Renato]

Hi Greg .

Thank´s for your help .

Best regard´s

Osni

[Larry Fernandez]

Hi friends !
I need contact to Ro Jett engines
this email does not work jett2008@jettengineering.com
already sent messages without a reply
Have other mail to contact (Ro Jett engines) ?

Thank´s
Regard´s

GOOD LUCK !!!!

And yes I mean that with all the sarcasm I can reach for. 

Larry, Buttafucco Stunt Team

[John Ashford]

Hey guys,

I spoke with Richard a few days before he left for the NATS and there is definitely a communication problem.  Since Richard's move, he no longer has internet access.  He and Edie are working on this for many reasons.  In the meantime you might try getting ahold of Dub Jett.  (I don't know the man)

Later,  John

[Leester]

I secound Larry's comments

GOOD LUCK !!!!

And yes I mean that with all the sarcasm I can reach for. 

Larry, Buttafucco Stunt Team

[Randy Powell]

I have contacted Dub Jett directly and he is very responsive. Very cool guy. He fixed my .65 BSE without a problem. I was happy enough to buy another engine from him. My contacts with Richard were less productive. He was a hard guy to get in touch with.

[Greg L Bahrman]

<I have contacted Dub Jett directly and he is very responsive. Very cool guy. He fixed my .65 BSE without a problem. I was happy enough to buy another engine from him. My contacts with Richard were less productive. He was a hard guy to get in touch with..>

I had the same experience with Dub..Cool guy, he helped out a lot. He told me to deal directly with him if I wanted successful communication and service. Even paid me back all the funds I send to Richard and after a year never received the parts I was promised. Yes it can be very fustrating when service is nonexistant.

[Balsa Butcher]

Randy: I read your posts on the trials and tribulations you were going through with your Ro-Jett 65. Can you post  how it was resolved or was it a magic wand/Houston Voodoo cure?  

[Randy Powell]

Pete,

The ROJett 65 swallowed a wrist pin retainer clip. It trashed the piston and cylinder. I got Dub on the phone and he had me take off the head and back plate. After the description of what I saw, he had me send it to him. This while he was leaving for a vacation in Hawaii. Most of the communication happened between me and his IPhone's email.   

He had the engine about 4 weeks (largely due to his being on vacation for two of them). I got the engine back with a new piston, cylinder and rod (he thought the rod looked flaky). His charges were nominal and the engine now runs great, though once again, it was a bear to break in. He was very responsive and answered all my questions without a problem. I ordered a .61 BSE from him during the correspondence. It also runs great.

I've always had pretty good luck dealing with Dub and Randy Smith. I'm quite happy with both guys.

[Larry Fernandez]

When I spoke with Dubb he told me " You guys have those things set up for a stunt run, I don't know your set-up so I really cant help you. Besides, I'm very busy right now and cant talk"

Thanks a lot Dubb  (again, said with much sarcasm)

Oh, and one more thing. Dubb refuse to believe that both RO Jett .65s were in fact brand new. How could they possibly be new, when he hasn't manufactured them for more than two years.

(Please forgive me for sounding a little pissed, but when you pay 750.00 bucks for two motors you kinda expect them to work right. If not, you would hope to get some support from Dubb or Richard.

I'm done sniveling now.

Larry, Buttafucco Stunt Team   

[Steve Helmick]

Larry...Did you tell Dub that you were a member of the Buttafucco Stunt Team, or the JCT?  Steve

[Larry Fernandez]

Larry...Did you tell Dub that you were a member of the Buttafucco Stunt Team, or the JCT?  Steve

Naw, I never liked pulling rank.

Hmmmm, Ya think that might help??

Larry, Buttafucco Stunt Team

[Randy Powell]

I'm sorry to hear that, Larry. My experience has been quite good. Did you tell him that they were perhaps made 2 years ago, but never run? Not that it should matter.

What kind of problems have you had?

[Osni Renato]

hello guys!

I sent message to ROjett but so far no response.
I'll be waiting for an answer

Regard´s

Osni

ps * See some photos of my city is beautiful but not where I fly I have to travel 100km to fly.
http://www.skyscrapercity.com/showthread.php?t=348334

[Balsa Butcher]

Might want to take into consideration that Dub just returned from the Nats where I believe he flew pylon...at least I saw his name listed at the AMA site covering that event. Probably pretty backed up with work etc. This doesn't apply to Larry's issue though. Hope it gets cleared up AND thanks for the details Randy P.

[Larry Fernandez]

I'm sorry to hear that, Larry. My experience has been quite good. Did you tell him that they were perhaps made 2 years ago, but never run? Not that it should matter

What kind of problems have you had?

I did explain to him that RO Jett .65 No. 1 was in fact purchased from him about two years ago.It has been sitting in the original box until about three months ago when I finally broke it in on the bench.

RO Jett .65 No. 2 was purchased from Elliot Scott, who was gracious enough to sell it to me when I found that they were not being made any more.
Again this motor was brand new when I received it from Elliot. Still in the box wrapped in a RO Jett towell, needle valve and shim still in the package and no plug installed. As I stated, this was a brand new motor.
When I explained this to Dubb, his exact words were, and I quote, " Sure, brand new, driven only on Sundays by a little old lady." I was not amused.

I was not asking for my money back or for him to rework it. All I wanted was for some advice to steer me in the right direction.

After twenty runs on the bench with an 11x4 two blade prop, run at 10k RPM, I then installed a 12.5x4 three blade which I intend to use in my new plane, the motors would not spin more than 9,800 RPM.
Something is not right.

Answers to upcomming questions.
 Pipe is set at 17.5 inches.
Fuel is Sig Championship 10% nitro, 20% oil half of which is castor (purchased two months ago)
Prop is a Mejlik (?) 12.5x4 three blade
Thunderbolt long R/C plug
Temp in the low ninties
humidity, 65%
Elevation 65 Ft.
Moon 3/4 full

Larry, Buttafucco Stunt Team






















 

[Leester]

I don't believe RoJett's like that much castor.

[john e. holliday]

Larry, sorry to hear of your problems with Dubby.  I have known of him since he would clean house in all the speed events in control line.  Then he went to other things.  I think mainly getting an education.  I think it was the Virginia Beach NATS I had the privelage of sitting pool side and having a talk with him.  He also told me the reasons for flying pylon in stead of speed.  He was very much a gentleman that day.  Now as far as castor in the ful Richard told me when I bought my RO-Jett 40 use only synthtic oil in the fuel.  By the way it may have been one of those days when Dubby was probably over loaded or getting tired. 

[Larry Fernandez]

Larry, sorry to hear of your problems with Dubby.  I have known of him since he would clean house in all the speed events in control line.  Then he went to other things.  I think mainly getting an education.  I think it was the Virginia Beach NATS I had the privelage of sitting pool side and having a talk with him.  He also told me the reasons for flying pylon in stead of speed.  He was very much a gentleman that day.  Now as far as castor in the ful Richard told me when I bought my RO-Jett 40 use only synthtic oil in the fuel.  By the way it may have been one of those days when Dubby was probably over loaded or getting tired. 

Doc, The paperwork I recieved with the motors states, "use the GMA blend fuel which has 22% oil with 1/2 syn. and 1/2 castor." (notice quotation marks)
We even added a bit of Klotz to up the oil percentage. no help.

My main point of agravation is. I SHOULD NOT HAVE TO RESORT TO THIS OR ANY OTHER FORUM TO GET THESE MOTORS TO RUN RIGHT. I SHOULD NOT HAVE TO CALL BRETT, RICH WALBRIDGE, PETE CUNHA OR ANY BODY ELSE. I SHOULD BE GETTING HELP AND ADVICE FROM THE PEOPLE I BOUGHT THE PRODUCT FROM.


Do you see my point, They have my money and I have two motors that are useless to me at this point.

Larry, Buttafucco Stunt Team

[Brett Buck]

My main point of agravation is. I SHOULD NOT HAVE TO RESORT TO THIS OR ANY OTHER FORUM TO GET THESE MOTORS TO RUN RIGHT. I SHOULD NOT HAVE TO CALL BRETT, RICH WALBRIDGE, PETE CUNHA OR ANY BODY ELSE. I SHOULD BE GETTING HELP AND ADVICE FROM THE PEOPLE I BOUGHT THE PRODUCT FROM.

     Given that we have determined that is has the right exhaust duration, I am leaning towards the pipe as the source of the problem. I think you should try it on one of my pipes so there's a baseline.  Or on open exhaust. It should have no problem at all spinning the prop at 12,000 rpm. I think mine tops out at about that if I pinch the line. On the engine cleanouts, it gets to about 11,300 and that's nowhere near the top. And that's a 61.

    As I recall, you are using the Windy/Dennis Toth pipe, which I have no experience with. My guess is that it is more restrictive than the pipe I use. One of the key things I found was that you want *as little restriction as possible* in the exhaust. Even changing the stinger by 1/32 ID made a big difference in the apparent power output. Richard runs his engines with gigantic props at what seems to me to be extremely low revs - in the low 9000s. That would make the exhaust restriction much less of a factor. I think you give up a lot of performance like that, but I suppose it's up to the pilot to decide.

     Brett

       

[proparc]

Doc, The paperwork I recieved with the motors states, "use the GMA blend fuel which has 22% oil with 1/2 syn. and 1/2 castor." (notice quotation marks)
We even added a bit of Klotz to up the oil percentage. no help.

My main point of agravation is. I SHOULD NOT HAVE TO RESORT TO THIS OR ANY OTHER FORUM TO GET THESE MOTORS TO RUN RIGHT. I SHOULD NOT HAVE TO CALL BRETT, RICH WALBRIDGE, PETE CUNHA OR ANY BODY ELSE. I SHOULD BE GETTING HELP AND ADVICE FROM THE PEOPLE I BOUGHT THE PRODUCT FROM.


Do you see my point, They have my money and I have two motors that are useless to me at this point.

Larry, Buttafucco Stunt Team

Larry, why don't just you sell the Rojett on Ebay and buy yourself a PA and end all of your problems.

[Randy Powell]

I know I like mine. On the Eather pipe I use, I set it about 17.5" but it's a pretty high volume pipe. On the Randy Smith (Werwage) pipe I've used, it has to be about 18.5" to get it into the right ballpark. I've generally run mine in a fast 4 stroke with little if any break and it runs at about 10,100 rpm on a Mej 12.5 x 4.1 two blade undercambered job. One the 12.5 x 4 three blade Eather flat back prop, it generally turns around 10,500 rpm. On the Bolly 12.5 x 4 two blade (repitched to about 3.8 or so), it turns about 11,100 or there abouts.

I've used 10/22 GMA Powermaster with good luck and more recently Wildcat 10/20 all synthetic fuel. Seems to really like that.

[Brett Buck]

Larry, why don't just you sell the Rojett on Ebay and buy yourself a PA and end all of your problems.

   Probably because he saw Ted and I have dead-bulletproof runs every time for the last ~8 years, and the type of run is very advantageous for his relatively small airplane.

     Brett

[Larry Fernandez]

Larry, why don't just you sell the Rojett on Ebay and buy yourself a PA and end all of your problems.

I could not in good conscious, sell a motor that is not right. How would you feel if you bought a motor on e-bay and it did not work properly??
How would I advertise it:  For sale,two RO Jett .65s that will not spin a 12.5x4 prop more than 9,800 RPM. no reserve

I don't think it would see much bidding action.

Larry, Buttafucco Stunt Team

[Richard Oliver]

Sorry, I moved and have had a terrible time getting internet. Been in the dark off and on since I moved here. Not sure why someone has not called me or mentioned it to me as I travel to contests but I am happy to talk with you and solve the problems you are having with the engines.
I just today spent several hours setting up service with a new provider getting to this thread. Not sure it will last. I am deep in the rural area of Texas and service is not good. I live 3 miles down a gravel county road. I have my son-in-law working on email. I do not follow the internet much as you might suspect.
Call anytime 281-744-9358 cell#
RO

[Richard Oliver]

Larry, I just went back and read you post on what you are running.
The engines might have stock venturi's (.189)in them. This alone may be your problem. We send engines out with venturi's small enough so you can drill to what you need them to be if at all.
Second the 12.5x4 Mejlik prop is under cambered and quite a load. 9800 with a stock venturi sounds pretty good. If the pipe has a stinger with less than .400 to .450 ID this may also be a problem.
RO

[Larry Fernandez]

   Probably because he saw Ted and I have dead-bulletproof runs every time for the last ~8 years, and the type of run is very advantageous for his relatively small airplane.

     Brett

Bingo !!!!!
I have seen these motors run. And when the run right, they are as good as it gets. "Dead-bulletproof"
Keep in mind ladies and gentlemen, I am not badmouthing the motors, I am however badmouthing the support and service of the product.

I have two GMA Jetts that you could not pry away from me, except for the lack in power (compared to the .61 &.65) I would put these motors against anything out there, in terms of reliability consistancy and smooth power delivery. I have used them in planes that were to heavy for the motor and they just chug along without a hint of complaint. It is the history of these motors and the performance of Bretts and Teds that I bought three recently.

Larry, Buttafucco Stunt Team

[Larry Fernandez]

Larry, I just went back and read you post on what you are running.
The engines might have stock venturi's (.189)in them. This alone may be your problem. We send engines out with venturi's small enough so you can drill to what you need them to be if at all.
Second the 12.5x4 Mejlik prop is under cambered and quite a load. 9800 with a stock venturi sounds pretty good. If the pipe has a stinger with less than .400 to .450 ID this may also be a problem.
RO

GREAT TO HEAR FROM YOU RICHARD !!!
I'll check the venturies and prop.  I do know that the pipe exit is .375 Would you suggest opening it up 1/2 inch? (not a problem).
The Mejlik prop is about an 1/8 wider and a bit thicker. I have already reshaped it to clone an Eather. Is it possible that the under
camber along with the thicker and wider blade is loading the motor down?
Thanks for posting. I know that with help from you and Brett, I'll have a fine competitive stunt motor.
I hope you can understand my fustration with this issue but I feel much better now hearing from you.

Larry Buttafucco Stunt Team
 

[Richard Oliver]

Hi Larry, Thanks for the kind words about the engines. On the pipe .500 is a little large but would work. I run .450. The stinger is set with JB Weld and can easily be changed. Heat it up with a heat gun and pull it out and use aluminum tubing from the hobby shop. K&S has all the sizes. The under camber is the most of the load you are seeing. This is not bad as it seems to help control the run but you need to get the RPM right. I do not run mine like Brett but have in the past. 10,000 is enough in cool and or thick air. 4 pitch is a little heavy for the higher RPMs also but you needs will dictate that. All of the early engines had the 144 exhaust timing but if yours does not and you want it we can change it for you.
Let me know how it goes. Again you can always call me.
RO

[Osni Renato]

Hi Guys!
I think that created a problem with this topic.
I apologize for any inconvenience.

I had no response Rojett in any message I sent, I am grateful to friends for help.
Do not try to contact more I feel that maybe there is not interest Rojett supply engines for Brazil.
Currently flight engine PA 65 which to me is the best engine I have ever used and I would have another 65 PA but have not found, I thought the Rojett might have already noticed that but do not have too, so I'm waiting to get a second engine PA65.

Best Regard´s

Osni

[Brett Buck]

. I do not run mine like Brett but have in the past. 10,000 is enough in cool and or thick air. 4 pitch is a little heavy for the higher RPMs also but you needs will dictate that. All of the early engines had the 144 exhaust timing but if yours does not and you want it we can change it for you.

        My idea was (since Larry lives very close by) to throw my setup on there, prop, pipe, etc,  to start and verify that there is nothing actually wrong with the engines. Larry and I have talked, and he measured the exhaust duration as 145, which is certainly within measurement tolerance of the expected 144. He also said he was running a #6 spigot venturi which is what I used to run with good results. The question mark I have is that with this pipe, I have no idea what to do as far as pipe length goes to replicate what I am doing.

     4" of pitch on the undercambered prop is clearly more than he is going to want on his small airplane at 10,000 rpm baseline I run. He would need to run in the low 9000s and I think that gives up a lot of power and speed stability.  I am at 3.75 on a flat-back prop and launch at 10-10,100 for an inflight rpm somewhere between 10,800 and 11,000 in a medium 4. Ted is running even faster with less pitch with good results as well. But I would have certainly expected it to go a lot faster than 9500 rpm - I have run the Eather "red" undercambered prop and it would easily get to 11,000 without having to lean on it.

    BTW, for what it is worth, I and several others have had less-than-ideal results with GMA and other 20+ percent 50/50 oil fuels. It's fine if you run it pretty hard, but when it is running in a medium 4 we have had the occasional "load-up" at times. I think it is a combination of overcooling and more viscosity. Switching to 18% 25/75 cleaned it up in every case, and RO-Jett fuel is even cleaner.

    Brett

[Richard Oliver]

Brett is right that I suggested a long time ago to go to lighter castor fuel. I personally use no castor in mine. I suggested in my paper work sith each engine to use the GMA because so many people did not like or accept my suggestion of fuel with little or no castor.
I have run the Mejlik and found it to be much more load than the Eather. So I am not sure that 9800 is a bad number for 4 pitch. I would fly it and then make assessments as to what is needed. I also tend to run my pipe a little longer @ 18" for 9600 to 9800 rpm.

Brett has the winning combination and it seems this would be the starting point, especially if he is there to offer help!!
Good luck,
RO

[Brett Buck]

I have run the Mejlik and found it to be much more load than the Eather. So I am not sure that 9800 is a bad number for 4 pitch. I would fly it and then make assessments as to what is needed. I also tend to run my pipe a little longer @ 18" for 9600 to 9800 rpm.

     That's a lot faster than I recall you launching at before, sorry if I misinformed anyone.

    With the Randy/Billy pipe, I am at 17.5 and it is marginally too short for the revs I run with the 144 deg version. It seemed pretty good with the 140 deg version,  and I think it's too long for the 136 deg version (but I haven't had a lot of luck with those I have tried to help people with, for other reasons).   Sometimes in the early morning around here the air is thick enough that I need to launch as low as about 9700, and it's clearly not regulating as well. Once it warms up, 10,000-10100 for launch revs puts it just about right in flight. I would pull it out 1/4" just to make it a little more solid at low revs but then I would have to fiddle with it for the really hot days. It has to be able to handle anything from 50 deg at sea level to 100+ in Muncie, preferably without changing anything but the fuel, and it pretty much does.

   Once I hit on the right combination, at the 2003 NATs, I have had nothing but perfect runs and for the most part, its' been dead repeatable with other people's "Brett/144 deg version" engines, Everybody has commented favorably on it - and the prodigious static thrust. Scaling the pipe length down for the 140 and 136 degree versions seemed to get a predictable setting that made me think the pipe was ok. But I never got that "46VF on steroids" sort of run at the revs and prop diameters we wanted to run.

  In Larry's case, he has a pretty small airplane and I think he is going to be going like a bat out of hades with the same settings as my airplane but 4" of pitch, and undercamber. I am at 3.75 and that's *plenty* for me, and Ted is all the way down to 3.5 last I checked, and all on flat-back props. The effective pitch of a 4" U/C prop is about 7"+ - which might explain the lack of ground revs due to being bogged down.  But as soon as he launches it I think it will be off to the races since it's still going to want to run 11,000 rpm in the air.  Of course, we could just try it and see!   I am a little skeptical about the load theory, but only because I ran the Eather prop that the Mejlik is an "homage" to on my 61, and it happily spun it at 12,000" on the ground as I was cutting it off lean. But I haven't actually tried it, and the Mejlik is quite a bit stiffer (and thus doesn't flatten out as much) and a little thicker.

  That's why I wanted to try some bench runs with controlled parameters to see where to go next. The fact that both 65s ran almost identically suggests it's not something actually wrong with the engine. 

  Completely off-topic, but I heard the NATs was a little muggy(!). What was the lowest you saw on the air density meter?

    Brett
   

[Richard Oliver]

Hey Brett, I have run my engines at every RPM one could imagine if for no other reason that to try it. I have never done this at the Nat's however. I was normally at about 9800 the first year and have gone down on RPMs every year since. I am launching this years plane at 83-8600. Although it seems to unload to a much higher RPM after about a half lap. I am estimating about 9600 to 9800.

As to the air in Muncie this year!! It was weird for Muncie. I am always prepared for density on my meter to be 89 before 8 am and go down from there to 82-83 by 10 am. This year was way out of character for Muncie. The day started at 93 and never went below 89 and returned to the 90s by late afternoon. It was very humid and this did affect power but not like years past. We had more dead air than anything else to deal with. I flew one official completely upwind after the inverted laps. Wind meaning about 1-2 mph. This Nat's was a hard one to figure out from flight to flight!
RO

[Larry Fernandez]

Some more specifics,

Both motors did come with a # 12 venturi (.189). One was opened up to a #6 (.204) with a spigot.
The prop is what I believed was a Mejlik, but now I am not so certian. It is  12.5 x4, but it is not undercambered. The back of the blade is quite flat. The blade width was about an eight on an inch wider than an Eather.(multiply this times three blades and I can see a significant added load on the motor. I have reworked the prop to be more like an Eather in shape.

The Windy pipe has an exhuast outlet of .375.  I will enlarge the opening before the weekend.

Thanks Brett and Richard for pointing me in the right direction.

Larry, Butafucco Stunt Team