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Post  mitchg95 on Sat Mar 17, 2012 1:14 pm

hi, i got an old airplane from the local hobby store yesterday for $10.00, it is in the arf form and is pretty old. The engine that it came with is a OS max-s 35, can anyone tell me how old this motor might be, and if i need to run it with a muffler (didnt come with one mounted). Ill post pics later when i get home from flying model airplanes with my uncle
thanks, mitchg95

p.s. it has the rc carb on it
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Post  SuperDave on Sat Mar 17, 2012 1:57 pm

mitch:



A muffler may or may not be required.

Check for any local regulations where you intend to fly.


Last edited by SuperDave on Sat Mar 17, 2012 4:07 pm; edited 1 time in total
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Post  mitchg95 on Sat Mar 17, 2012 2:00 pm

ok, im just wondering if it will damage the engine because of there being no muffler, ie making it run more lean
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Post  SuperDave on Sat Mar 17, 2012 3:14 pm

Mitch:

Older engines were most often run without mufflers until regulations requiring them were enacted. The "add on" mufflers came into use to comply with noise restrictions and nothing more.

People who complain about noise don't much care about engine damage. Very Happy
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Post  Puffie40 on Sat Mar 17, 2012 4:17 pm

very far from cox but still glow power Osm-1963-max-s35

According to OS's website, the s-35 was made in the early 60's. The early OS motors seem to have a reputation of excellent power output, at least on the RC Forums.

As for running the motor without a muffler, I don't think it would damage it. if the motor was designed for one, it would just affect the performance.
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Post  Ivanhoe on Sat Mar 17, 2012 5:40 pm

In my younger days, ALL engines were run without silencers (mufflers) and certainly the OS range in the early 60s were not designed to use them. You cannot "Damage" an engine by adding/removing a silencer, just reduce it's power output if you fit one on an engine not designed to use one. The only reason that silencers are universal now is because of the loss of many flying sites due to noise complaints, I live way out in the country with no-one to complain, and I run virtually all engines without them.
The one exception are racing engines which use what is called a "Tuned pipe" these engines will often not run at all without the silencer because the system actually relies on the exhaust backpressure to help the timing, but the OS is not one of these.
If you have no problem with noise annoying anyone, go ahead and run the engine as it is!


Last edited by Ivanhoe on Sat Mar 17, 2012 5:42 pm; edited 1 time in total (Reason for editing : Typo)
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Post  RknRusty on Sat Mar 17, 2012 8:16 pm

I've wondered how a tuned pipe works. Is that the long tube that looks like it has a big collector swept way back to a small outlet?

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Post  mitchg95 on Sat Mar 17, 2012 8:57 pm

http://en.wikipedia.org/wiki/Two-stroke_engine

scroll have way down and it shows how a expansion pipe works

thanks for the input guys, thanks for the pic Puffie40, thats the exact engine that i have minus the muffler
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Post  dckrsn on Sat Mar 17, 2012 9:08 pm

very far from cox but still glow power Expans10
Tnx Mitch. Good info.
Bob
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Post  mitchg95 on Sat Mar 17, 2012 9:15 pm

dckrsn wrote:very far from cox but still glow power Expans10
Tnx Mitch. ood info.
Bob

no problem man Very Happy
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Post  RknRusty on Sat Mar 17, 2012 9:16 pm

Great illustration. I had to stare at it for a few minutes. I think I've got it. Looks tricky to tune.

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Post  dckrsn on Sat Mar 17, 2012 9:24 pm

From what I see and have heard, the tuning(pipe tuning) is done
by adjusting the pipe length between the exhaust port and the
expansion chamber.I guess you could use a telescoping pipe to find the sweet spot.

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Post  PV Pilot on Sat Mar 17, 2012 11:26 pm

Different length flex couplers, trimming the tip(stinger end) are the two biggies for fine tuning a tuned pipe. There are HUGE gains to be had, but it takes cubic bucks once you get to tuned pipes and custom built motor. Whole different tax bracket.

The outrigger nitro hydro racers thrive on this stuff. I mean we are talking REALLY fast boats. Been to a couple of these races.
https://www.youtube.com/watch?v=4xlgK-Nzxe4&feature=related
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Post  Ivanhoe on Sun Mar 18, 2012 3:48 am

mitchg95 wrote:http://en.wikipedia.org/wiki/Two-stroke_engine

scroll have way down and it shows how a expansion pipe works

thanks for the input guys, thanks for the pic Puffie40, thats the exact engine that i have minus the muffler

I'm glad you found that! I'm not technical enough to explain, or really understand it fully!
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Post  Puffie40 on Sun Mar 18, 2012 4:50 am

If you *Really* want to know more about tuning two-strokes, This book can help. Smile
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Post  microflitedude on Sun Mar 18, 2012 7:04 am

Puffie40 wrote:If you *Really* want to know more about tuning two-strokes, This book can help. Smile

That looks like a great book, I'll have to read it sometime.
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Post  mitchg95 on Sun Mar 18, 2012 3:04 pm

yeah, i have a tuned expansion pipe in my 1/5th scale hpi baja 5b's engine that is 30.5cc
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Post  John Goddard on Mon Mar 19, 2012 11:47 am

This is why my Parents Neighbours enjoyed my residence so much circa 1982
Very Happy

https://www.youtube.com/watch?v=esTd8kMn-lI&feature=related

You Guys got guns we had insane 2 stroke road bikes.
lol!
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