EDITED

I've been asked again if I would do a run of Fox 36 Mk 4-5.

Again, I'm happy to do these if there are enough numbers. WE HAVE ENOUGH NUMBERS

They will be stock Mk V timing and include piston/liner/rod/pin/head shims/backplate gasket.

Also doing Tyndal double bubble head buttons to suit stock long reach plugs, and also Nelson head buttons. So let me know if you want either or both.

Piston/liner/rod/pin/shim sets will be approximately $115 to $125 Australian dollars. Don't know what the head buttons will be $.

So anyone wanting extra parts such as head buttons, rods, additional backplate gaskets needs to let me know so I cater sufficiently.




Brian

I’m in for two or more

Brian

I'll take 4,

If the Wiley spec makes more power SUPER

If not standard is fine

Mike

PS  If Brian does cylinder heads I would take 6 to 8 of them

Mike 

Hi Brian.

What is the minimum number to make this happen.

OK to share this on the MACA FB page?

4 and 6....5 is a failed anomaly

I tried  twice to get Brian to do Fox 36 MK IV..MK VI  internals....never got enough pre orders and argument with Jeff Dawson and I about stock timing vs Willy ...Jeff wanted more aggressive Willy dimensions....I wanted stock better parts

I still have several NIB Fox 36 MKVI.....sold a butt load of my Marvin Denny FOX 36 IV/VI s to a  guy in Oz
I am out--- not ordering.....but if  Brian needs a factory Fox 36 MK IV...(with "C" on port side) I can send the sample for measuring

editd in.....BTW..Brian occasionally includes heads and gasket/shims....someone should send a Tyndall Hemi head to replicate...C.T Shafer can elaborate I bet....

and if someone wants or needs a stock new MK VI...make an offer

I need 20 units ordered minimum.

Price would be approx. $115 to $125 Australian dollars (plus shipping). That is for piston/liner/rod/pin/shims.

If you want some different head inserts that will be extra (not sure how much yet).

I don't have experience specific to this engine, so it is up to you guys to come to a consensus as to what you want and supply  preferable 2 sample engines.

OK to share to other places, but I don't want to be chasing around various noticeboards etc to collate numbers. So I'd prefer all requests on here.

Brian

The Mk. VI P&L will also fit in a Mk. VII, correct?

OK to share this thread on the MACA FB page?

  NO, the Mk VII Liner WILL NOT fit in the Mk III - Mk VI case, it has a much larger OD.
 Guys in are club would put Mk VI ABC piston & liners in their MkIII & IV engines that had the steel internals, and ran them in our Warbird racing event.
 I think using the porting in the MkVII would make a stronger running engine, but the case might have to be modified to take full of advantage of the ports.
  From what I heard,  Fox supplied a .020 liner shim for the Mk IV, to raise the timing for more power.
New head buttons with a double bubble chamber, using a Nelson or turbo plug would be cool to have, I would order at least 4.
 I personally never measured difference in the rod or crank pin between the MkIII to MKVI engines, but the the bore is the same from MkIII to MkVII. The Mk VII has a much larger crank pin.

The MkIV Crank will fit in the MKIII. The Mk VI and MkVII cranks only fit their specific engine.
Al

Brian,
I can supply you with a couple of new P/L'ers(2) and a new motor(1) for your project.  I'll want them back.  Also have stock and custom rods(RPM and Aussie rods) for the Mk VI if you are interested in duplicating one of those.

You REALLY need to have Don Repp weigh in on this discussion.  He can tell you exactly which direction to go.

My opinion is go with stock replacement and if folks want a different more aggressive timing then shim it and get a new head insert made. 

I have way too many motors and spares now but if I can, I want to help you help others.

Thank you,

Lane Puckett

OK guys, between here and direct emails I have enough people to go ahead and do a small run of these.

It would appear the consensus is stock timing.

I need a good sample engine as a loan to go ahead with this. Also any head buttons or aftermarket rods you guys want replicated.

Brian

I would be in for 6 each of the better rods & improved cylinder heads

Anyone else???

Mike

Brian, I can probably come up with one of my "double bubble" head inserts that I sold many of back in the '70's and '80's. These will fit the Fox MK III and the IV. I will dig up the drawing for these, also. These inserts were made for standard long glow plugs. I didn't make any of these for the Nelson plugs. I'll get something in the mail to you soon.


                        Dick Tyndall
                        Virginia Craftsman

Thanks Dick, that would be great.

I'll send you a PM with my address.

Brian

Brian, I can probably come up with one of my "double bubble" head inserts that I sold many of back in the '70's and '80's. These will fit the Fox MK III and the IV. I will dig up the drawing for these, also. These inserts were made for standard long glow plugs. I didn't make any of these for the Nelson plugs. I'll get something in the mail to you soon.


                        Dick Tyndall
                        Virginia Craftsman

Brian,

Will you build the heads for Nelson plugs or will they use standard?


Mike

Good to know

Was just thinking my Nelsons & Fora's use Nelson & I have a huge pile of them

Mike

People have asked for both the Tyndal double bubble head button and also Nelson. So I will do both.

So those that want head buttons need to let me know which type and how many to add to the list.

Brian

3 Nelson head buttons

Guys, Do you want laser cut backplate gaskets too?

Brian

 2 piston & liner sets, 4 Nelson heads, and 10 Gaskets .
Thanks Al

I will order 2 P/L's, 3 Nelson head buttons, 6 gaskets. 

Guys, this (and all my other projects) has been delayed due to Covid19 issues. But things are back to normal and the ball will start rolling.


I have some drawings etc for the Nelson plugs, but what is the thread?

Pretty sure it is 11/32 - 32 UNEF

Please see the edited first post in this thread.

Please post the US pricing for the Fox piston, liner and rod sets.

Isn't the Mark VI a different part set form the Mark III, IV, and V?

Done Phil

These are just starting to kick off. Covid19 has put me way way behind this year

Brian

Brian, please put me down for two sets, done long reach and 1 Nelson plug head.

Not forgotten or dead in the water guys. Just progress is slow.

Brian

I've added you to my list Gordon.

Brian

Brian, I wanted the Fox m2 piston and liner sets, But I don`t see my name on the list above. Don`t know why,
but still want a set.

Thank You
Gordy

gordandelaney@yahoo.com

Hi Dick,

Yes, I have you on the list.

I am way way behind on projects. Between shipping problems due to covid last year and the invasion of Ukrain this year material supply has been a problem. Things are moving again now but my backlog has become outragious.

I apologise for the delay on all my projects.

Brian

Hi Brian,
    I probably mentioned this in an email or a letter, but put me down for (2)Fox MK 3-4 ABC P&L sets with the Tyndall double bubble head inserts for the standard long glow plugs.
   I hope things are going well with you.

                       Dick Tyndall

Brian,
Fantastic to see you are getting some P/L'ers and related stuff made and out.  Congrats!  I'll pm you a quick question and then hope to talk to you via phone.

Thanks,
Lane Puckett

List updated Phil.

These and the ST35 will be getting priority after the current run of 160 x OS61VF are done.

Brian

I've been asked again if I would do a run of Fox 36 Mk 4-5.

Again, I'm happy to do these if there are enough numbers. WE HAVE ENOUGH NUMBERS

They will be stock Mk V timing and include piston/liner/rod/pin/head shims/backplate gasket.

Also doing Tyndal double bubble head buttons to suit stock long reach plugs, and also Nelson head buttons. So let me know if you want either or both.

Piston/liner/rod/pin/shim sets will be approximately $115 to $125 Australian dollars. Don't know what the head buttons will be $.




Brian

i=
I'd like 2(two) piston liner assemblies and 2 of each head: Tyndal long reach,  Nelson plug version

Thanks Brian
Phil C

Hello

Nice to know you are still making Fox 36 parts but wonder will mk4 and 5 sets fit a mk6?
If the Mk 6 is different is it a possible for the future?
Thanks
Regards Gerald

Hello Brian

Thanks for your reply , it would be great if we could get some Mk6 P/C sets made , how many orders would you need?

Think the Mk6 was steel on the very early ones but most were ABC , while the Mk7 was only AAC but had problems so people retrofitted the ABC sets from the Mk6.

 Regards Gerald Wimmer

These are ready guys.

I'll start contacting everyone on the list and begin shipping out. Bear with me - I'm insanely busy trying to keep up with this and my wheelchair basketball commitments both on court 4 times a week and also on numerous committees managing teams and organising tournaments, funding grants, charity fundraisers etc.

Brian

Al, That is what Dick Tyndall noted in the first page of this thread.  He ran 30% nitro with those heads which is what they were designed around. 

Lane

If people want a copy of the nelson chamber I can do that if the orders are there.

  I got my order and Brian's work is excellent as in the past. The thing that I'm not too thrilled about is the Tyndall double bubble head inserts. These inserts have a very large combustion chamber. In my opinion, you will have to really tip the nitro can to get power almost like a Nelson 36. This will also cut down on the overall run time per oz of fuel used. I think a better head design would have been to copy the Nelson 36 double bubble head that has a much smaller combustion chamber, and would produce a high-power output with only 10% nitro and is a proven design. I would be in if Brian would made them.
Al

  When I first started making the double bubble inserts for the Fox MKIII and MKIV engines in the late 1970's I was shooting for more performance without throwing gobs of nitro in the engine and having it self destruct in a short period of time. Just being 4 or 5 MPH faster than the other guys was good enough for me and keeping the engines in one piece was a good thing. At the 1983 NATS, Rich Lopez stated in his Combat article in Flying Models magazine that " Tyndall and ( Steve ) Kott seemed to have the fastest airplanes"  ( I also built Steve's engines ) . I personally had to agree with him. Steve finished 3rd and I finished 5th out of 42 contestants. Note that this was before Henry made any .36 engines if I'm not mistaken. Henry's engines , when they came out, made everything else obsolete ( in my opinion ). When this happened I was not flying airplanes anymore I was racing R/C boats ( I still am ). Duke Fox never made a .36 combat engine that was anywhere close to Henry's engine ( Sorry Duke; just my opinion ).
   Long story short: I started making the double bubble inserts and stopped making them long before the Nelson .36 came out.

                     Dick Tyndall
                     Virginia Craftsman

  I'm impressed. Your Fox MKVII is 3MPH SLOWER than my MKIII engines that I ran 40 years ago. If I had wanted to run 10% nitro fuel, I would have run the head clearance down to around .008, put on a prop with a little less pitch and a hotter glow plug. It would probably still run close to 120MPH, but might be a little tougher to pull a streamer.
   If you want to go fast, buy a Nelson. One just sold on Ebay for $1,901.

                   Dick Tyndall

Al, at what speed are you guys going to .018"


MM

   If you want to go fast, buy a Nelson. One just sold on Ebay for $1,901.

                   Dick Tyndall
[/quote]
  FYI, I own 6 Nelson 36 and the new Fora 36 and my Fox MK7 is just as strong as them. I even did a combat match Fox MK7 vs Nelson, same plane, prop, and fuel. Both planes were exactly the same speed.
 Al
 Heads attached, The Nelson is a complete head
 

I don't think Al's comments were intended to bad mouth your head buttons Dick. More of a comparison.

A few have already requested copies of the Nelson chamber which I'm happy to do if the numbers increase a bit more and someone wants to loan me a head to copy the chamber from.

Brian

Al, at what speed are you guys going to .018"


MM

AMA rules for fast combat have required .018" x 60' for decades. Anything else is irrelevant

AMA rules for fast combat have required .018" x 60' for decades. Anything else is irrelevant

That's good but they fly Vintage combat on .016" last I knew. I suggested they go to .018" for increased safety but apparently I'm stupid.

MM

Well, Why, bring Vintage Combat into your discussion.

 Our Vintage Combat days are not matches and we don't fly matches on .015 lines. Our speed runs were to replicate the days when Combat was flown on .015 lines that's why we do it. Everyone who comes can fly on .018's no one will stop you. I even calculated our model weights to speed as the speed flyers use. We are within the parameters of 80% of breaking strength for 1 line as required for speed. Basically, our cutoff engines are the G21-35 and the 36X BB, Not the Baldie, no mark 3-7's, no nelsons.
  This is really getting old. WE are just having fun flying the old stuff as back in the day. We have yet to have a line break or a fly away and 2023 will be our 10th year. We are not making false claims, put your money where your mouth is.

    And correct you are. Double bubble head inserts were around years before I started making them for the Fox MKIII's and IV's. I made some for the early Rossi .15's ( 10.5 MM rear bearing engines ) for my Scale Racers before I started working on one that would work on the Fox's. I'm not trying to take any credit for "inventing the wheel" on this because I did not. I knew that it worked on other engines and after much trial and error ( and making A LOT of different kinds of inserts! ) I hit on one for the MKIII's and MKIV's that worked for me ( and for a lot of other people, also ). Just wanted to make something better than what Duke was selling with these engines. And it was.

                      Dick Tyndall

Hate to burst anyones bubble but the double bubble is an inferior design. If you happen to need a very large combustion chamber for some reason, there is a proper way to do a double bubble but, the ones pistured here are not even good for that. Better than Fox heads yes, I agree.

    Thank you, I will send you the Nelson head if you need it.
Thanks Al
[/quote]
    Nelson head is on its way.
Thanks Al

You did send it to my new address? 115 Daintree Drive...........


Brian
[/quote]
  Yes, Tracking says it it departed a transfer airport in Kingsford Smith, Sydney Australia on Feb. 8 at 8:13 am. The item is currently in transit to the destination.
Al

Sample Nelson head received. I'll try schedule this in as soon as I can.

Brian