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Author Topic: OS Max 61 FSR ABC Engine  (Read 4588 times)

Offline Gary Anderson

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OS Max 61 FSR ABC Engine
« on: February 15, 2011, 01:42:20 AM »
Hi guys,

Has anyone played with this monster engine??? I really like the OS 40 fsr, some say that the OS 45 fsr is a better engine. Is the 61 to big, to heavy, does it run the same way the 40 and 45 runs??? If it has power like its smaller brothers, what size plane would she fly???? My 40 and 45 doesn't use much fuel, is the 61 the same???? I would appreciate any input.

Thank You
Gary Anderson
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Gary Anderson

Offline proparc

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Re: OS Max 61 FSR ABC Engine
« Reply #1 on: February 16, 2011, 03:31:23 PM »
Sorry for the late reply. Windy Urtnowski used one for his foam wing version of his Sweeper to good effect at the Nats. I believe he placed 17th,(not sure) with it. The plane also had a very large bellcrank in it.
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Milton "Proparc" Graham

Offline Robert Zambelli

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Re: OS Max 61 FSR ABC Engine
« Reply #2 on: February 17, 2011, 10:39:36 AM »
And, HERE IT IS!!!

The original Sweeper engine.  #^  #^

I removed it when I restored the plane. It had an issue.  :'(  :'(

Bob Z.
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Offline Brett Buck

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Re: OS Max 61 FSR ABC Engine
« Reply #3 on: February 17, 2011, 11:11:59 AM »
Quote from: proparc on February 16, 2011, 03:31:23 PM
Sorry for the late reply. Windy Urtnowski used one for his foam wing version of his Sweeper to good effect at the Nats. I believe he placed 17th,(not sure) with it. The plane also had a very large bellcrank in it.

   I think (Zambelli can confirm or correct) that this airplane was the 1200-square inch monster. It's *just too big* for 70-foot lines. Even the 900 sq in airplane looked like a Sprint cup car driving around a go-kart track.

   If I was in the market for big 4-2 break motors, there's a lot of choices I would make before something like a 61FSR, including some relatively inexpensive versions.

    Brett
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Offline RandySmith

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Re: OS Max 61 FSR ABC Engine
« Reply #4 on: February 17, 2011, 11:50:08 AM »
The weight of a 61 OS is the biggest negative

Randy
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Offline Robert Zambelli

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Re: OS Max 61 FSR ABC Engine
« Reply #5 on: February 17, 2011, 12:36:12 PM »
The engine weighs 16.7 ounces as shown.

Here is a picture of Alex holding the Sweeper.

Bob Z.
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Offline Gary Anderson

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Re: OS Max 61 FSR ABC Engine
« Reply #6 on: February 17, 2011, 01:49:52 PM »
Quote from: Robert Zambelli on February 17, 2011, 12:36:12 PM
The engine weighs 16.7 ounces as shown.

Here is a picture of Alex holding the Sweeper.

Bob Z.

Hi,
I'm suprised you don't have this engine running on pipe. Didn't Windy use pipe with this engine??? I'm running the 40 FSR on pipe and she couldn't be better???
Gary
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Gary Anderson

Offline proparc

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Re: OS Max 61 FSR ABC Engine
« Reply #7 on: February 17, 2011, 08:22:20 PM »
By the way, what our ST 46 was to us, this motor was to the RC boys. Be careful what we say, as we our on hollowed ground here,(RC boys may be lurking on this site). Supposedly, there is still some very hot activity on Ebay surrounding this motor,(one guy bought 6 !!!) because of the rise in popularity of the Senior Pattern event,(our Classic). One of these things in the nose of a well built Tiger Tail, can take care of serious business.

Interesting thing about the Senior Pattern Association is that, they are kind of like us in that, these guys were rocking before the advent of ARF's and now that they are back, they still know there way around an Exacto knife. Some really nice planes in this group.
« Last Edit: February 17, 2011, 09:05:44 PM by proparc »
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Offline Brett Buck

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Re: OS Max 61 FSR ABC Engine
« Reply #8 on: February 17, 2011, 09:20:59 PM »
Quote from: Gary Anderson on February 17, 2011, 01:49:52 PM
I'm suprised you don't have this engine running on pipe. Didn't Windy use pipe with this engine??? I'm running the 40 FSR on pipe and she couldn't be better???

  Nobody was running a pipe at the time. Windy was one of the later adopters of piped engines (having been unable to get a reliable run on the 40VF) and - loudly- preferred the ST60. To the point that we had about a decade-long war about it.

    There's no reason you couldn't do it but, like the 40FSR, you would be sort of on your own. I could take a stab at a starting point for a setup but it would just be guessing.

   Brett
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Offline Gary Anderson

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Re: OS Max 61 FSR ABC Engine
« Reply #9 on: February 17, 2011, 09:39:18 PM »
Quote from: Brett Buck on February 17, 2011, 09:20:59 PM
  Nobody was running a pipe at the time. Windy was one of the later adopters of piped engines (having been unable to get a reliable run on the 40VF) and - loudly- preferred the ST60. To the point that we had about a decade-long war about it.

    There's no reason you couldn't do it but, like the 40FSR, you would be sort of on your own. I could take a stab at a starting point for a setup but it would just be guessing.

   Brett
Hi Brett,
Thank you, I think this motor is a little to much for me, I'm going to stick with the 40 fsr and 45 fsr. These two make enough power for just about any size plane I want to fly and you're correct I think the plane can get to big for the area we fly in. To me wing length from 52" to 64" is as big as I want to play with. To me anything bigger just doesn't look right??? Sometimes the Strega looks fun to me cause she looks to big to me???? As far as to much pull, I believe you can set up a plane so she doesn't pull your arm out but if she runs away, look out baby, you're in for the duration?? At the moment I'm having a lot of fun with the ST 46 but I'll have to get the 40 FSR out again. Its just neat to hear the power that baby makes. I appreciate your input Gary
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Gary Anderson

Offline Brett Buck

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Re: OS Max 61 FSR ABC Engine
« Reply #10 on: February 17, 2011, 09:57:15 PM »
Quote from: Gary Anderson on February 17, 2011, 09:39:18 PM
Hi Brett,
Thank you, I think this motor is a little to much for me, I'm going to stick with the 40 fsr and 45 fsr. These two make enough power for just about any size plane I want to fly and you're correct I think the plane can get to big for the area we fly in. To me wing length from 52" to 64" is as big as I want to play with. To me anything bigger just doesn't look right??? Sometimes the Strega looks fun to me cause she looks to big to me???? As far as to much pull, I believe you can set up a plane so she doesn't pull your arm out but if she runs away, look out baby, you're in for the duration?? At the moment I'm having a lot of fun with the ST 46 but I'll have to get the 40 FSR out again. Its just neat to hear the power that baby makes. I appreciate your input Gary

   Well, if you think the Strega is too big for you, the Sweeper or similar-sized airplane (bordering on twice the size) will really be over the top.  Not that the size is all that unreasonable for a very strong 4-2 break motor. You need something pretty big to absorb the power - its not very easy to control without the pipe regulation. A PA75 is a *much* stronger engine but with a pipe you can control it and put it in an airplane about the size of a Thunderbird with no particular problems and tremendous performance. So it might be largish for the engine but not outlandishly so.

    What it is too big for is the 70' lines. You only have so much space to maneuver in and it's really tough to force such a large airplane into the available space. If you could run 100' lines it might be a different story. And I sure wouldn't want to try to hold on to such a beast in a 25 mph wind. I am not a football lineman type but neither am I a midget, and even a nice little 4-lb Infinity with a perfect engine run is a pretty good tug.

     Brett
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Offline Robert Zambelli

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Re: OS Max 61 FSR ABC Engine
« Reply #11 on: February 18, 2011, 07:15:07 AM »
Brett is correct - it's just too much airplane for a 70 foot circle. Probably like flying a Nobler on 45 foot lines.

If anyone is interested, I will start a new post in the open forum section with some photos and specs of the Sweeper.

What really surprised me was how well it flew. The OS engine pulled it effortlessly.
BUT, it is one thirsty engine - it needed well over 7 ounces for the pattern.

Bob Z.
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Offline Robert Zambelli

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Re: OS Max 61 FSR ABC Engine
« Reply #12 on: February 18, 2011, 07:38:24 AM »
Gary asked: "
Hi,
I'm surprised you don't have this engine running on pipe. Didn't Windy use pipe with this engine??? I'm running the 40 FSR on pipe and she couldn't be better???
Gary"

Gary: from what I can see, there was indeed some sort of internal exhaust system on the Sweeper although when I restored it, the system was not operable. I do not think that it was tuned - just a plain pipe or tube.
Take a look at the protrusion on the inboard side of the fuselage, just forward of the leading edge. It apparently connected to the muffler and directed the exhaust all the way back, exiting through the tail.

You can see more photos in my new thread in the "open" section.

Bob Z.

 
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Offline Brett Buck

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Re: OS Max 61 FSR ABC Engine
« Reply #13 on: February 18, 2011, 01:27:51 PM »
Quote from: Robert Zambelli on February 18, 2011, 07:15:07 AM
Brett is correct - it's just too much airplane for a 70 foot circle. Probably like flying a Nobler on 45 foot lines.

If anyone is interested, I will start a new post in the open forum section with some photos and specs of the Sweeper.

What really surprised me was how well it flew. The OS engine pulled it effortlessly.
BUT, it is one thirsty engine - it needed well over 7 ounces for the pattern.

  Actually, that's not way out of bounds for any current engine. I think the David PA75 setup is running something like 8.5 oz, and my PA61 setup ran about 7.5. The best I do with the RO-Jett is around 6.75 but I can run it hotter/more efficiently than the PA.

   Certainly, you are going to have to use a lot of fuel to provide power for that size airplane.

     Brett
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Offline Robert Zambelli

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Re: OS Max 61 FSR ABC Engine
« Reply #14 on: February 18, 2011, 02:26:27 PM »
Hi, Brett - agreed. Well over 7 ounces.
As I recall, with seven ounces, it would just barely get through the overhead.

Anyone interested in buying one? It's going CHEAP!

             http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110649100727

  Bob Z.
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Offline dennis lipsett

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Re: OS Max 61 FSR ABC Engine
« Reply #15 on: February 18, 2011, 04:52:21 PM »
This reply is slightly off center but the complaining about fuel is somewhat humerous to anyone who flies larger models with larger glow engines. I think I peaked with Tartan twins and OPS twins with fuel tanks of about 55 oz. a flight.
Dennis
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