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Author Topic: OS 35 FP stunt  (Read 1902 times)

Offline Jim Kraft

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OS 35 FP stunt
« on: February 05, 2015, 08:11:23 PM »
I know from experience that the 40 FP engines are hard to tame for stunt. A pair of 35's have fallen into my engine stash, and I am wondering if they run any better than the 40's. Anyone have any experience with the 35?
 Seems like I read somewhere that they ran a pretty good stunt run if the boost port was blocked.
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Offline Mark Scarborough

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Re: OS 35 FP stunt
« Reply #1 on: February 05, 2015, 08:38:27 PM »
the 35 is pretty much a straight out of the box setup as I recall,, of course proper fuel,, prop and venturi,, but they are not nearly as problematic as the 40,, Randy Powell has had great luck with them back in teh day as I recall
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Online Brett Buck

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Re: OS 35 FP stunt
« Reply #2 on: February 05, 2015, 09:07:43 PM »
Quote from: Jim Kraft on February 05, 2015, 08:11:23 PM
I know from experience that the 40 FP engines are hard to tame for stunt. A pair of 35's have fallen into my engine stash, and I am wondering if they run any better than the 40's. Anyone have any experience with the 35?
 Seems like I read somewhere that they ran a pretty good stunt run if the boost port was blocked.

  Run it as intended first. I had a 35FP iron liner motor and it worked very well with an 11-4 Taipan on my ST46 airplane, and was about a match, performance-wise for a very strong ST46 as run at the time. It even ran pretty well with a 10-6 or 11-6 in 4-2 break mode, although it wouldn't match the ST in that mode. It is much more likely to work than the 40FP, which is pretty much a lost cause as it comes.

   In general, modifications are *very occasionally* a necessary evil. The best idea is do as well as you can with it as it came out of the box, and not lock yourself in to a fixed plan. Only jump to modifications when that approach fails - which will be *far, far* less often than you would guess from reading about it here.

   Blocking a boost port (or just leaving it out) can sometimes be useful approach, but unless you know for sure, probably shouldn't start out with it, because it definitely will cost high-RPM power.

    Brett
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Offline Andrew Hathaway

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Re: OS 35 FP stunt
« Reply #3 on: February 05, 2015, 09:11:37 PM »
Hi Jim.  We've got at least three of them.  The 40FP-S used to always be sold out at the hobby shop, while the 35 for $5 less would always be in stock, so we bought a few of them in the early 90's.  They run enough like the .40 that I can't tell any difference.  The run-away special on my red-white-blue Banshee was a .35FP, it's been on dad's Twister for several years now and runs OK but it's nothing great.  Ours were all the ABC or ABN whatever, the steel piston version might run better.  

If you didn't like the .40, I'm guessing you won't like the .35 either.  
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Offline RandySmith

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Re: OS 35 FP stunt
« Reply #4 on: February 05, 2015, 10:23:57 PM »
HI
Without going inside the engine, 2 things that helped them greatly was to replace the stock muffler that came with the CL version, and replace the NVA with either an OS 35S  or  Enya or ST NVA, these were larger diameter and made the venturie more the right size, the stock CL muffler has a very tiny outlet hole and didn't flow well, plus it ran the engine much hotter, the stock FP35 RC muffler was much better. I setup over 300 of these

Randy
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Offline Jim Kraft

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Re: OS 35 FP stunt
« Reply #5 on: February 06, 2015, 07:03:29 AM »
Thanks for all the replys guys. I will probably clean these up and try them just to see how they run, and then if they do OK, I will give them to someone starting out. I hate to give away engines that don't work at all.

   That is the one thing I like about the old McCoy red heads as they always run steady and are easy to handle. I have given a few of those away and can always count on them to run for about anyone. Granted, they don't last as long as others, but they run great while they last. If the McCoys had the longevity of the Fox 35 we would have a great beginner engine. Foxes seem to run for ever, McCoys not so much. The McCoys also seem to vibrate a bit less and run much better on profiles.
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Offline Garf

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Re: OS 35 FP stunt
« Reply #6 on: February 07, 2015, 09:12:20 AM »
I have 3 FP 35 non ABC engines. 2 always ran good while one didn't run well. The one had a bind in it. I traced it to a bent rod. How it got bent, I never figured out. I replaced the rod and no more bind.
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