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HelicopterMain Discussion › Exhaust exit
01-04-2010 05:54 AM  7 years agoPost 1
krashtagain

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ohio

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Does it or would it effect the tune up or power range if one was to lengthen the exhaust deflector as far reward as possible ?

If you're not living on the edge you're just taking up space !

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01-04-2010 06:14 AM  7 years agoPost 2
RcNutTz

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Chicago Illinois USA

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i asked a few local flyers about that they told me it would put more back pressure on the engine so i never did, i know it sucks wiping down your bird after a day of flying (especially if you keep them indoor like I do)

yes dear the hobby shop again

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01-04-2010 12:36 PM  7 years agoPost 3
GMPheli

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W. Bridgewater, MA USA

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People have posted in the past that extending the deflector is a tunable thing. In other words length makes a big difference. You should use as big a diameter tube as you can (half inch or so) and experiment with the length. Supposedly you can achieve no noticable power loss with a good tuned length. Some claim they were running lenghts of around a foot or so. Again this is what other people have reported in the past.

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01-04-2010 04:16 PM  7 years agoPost 4
cudaboy_71

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sacramento, ca, u.s.

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my guess is it will be purely a backpressure issue, if any at all.

the word 'tuning' as it relates to a pipe is the specific wave length between the cylinder wall to the first baffle of the pipe (the first baffle being the point at which the sound wave is returned to the cylinder for the supercharging effect). AFAIK the exhaust extraction (sound wave out) and supercharging effect (shockwave in) are the only two tunable characteristics of a 2-stroker. and, neither are affected by changes after the first baffle.

if it ain't broke, break it.

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01-04-2010 09:11 PM  7 years agoPost 5
BarracudaHockey

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Jacksonville FL

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It's a back pressure issue. Use what you need but don't get carried away.

Andy
AMA 77227
http://www.jaxrc.com

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01-04-2010 09:33 PM  7 years agoPost 6
Dilbeck

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Springdale Arkansas

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The scale guys will help you with the subject at hand, Word is keep getting bigger and bigger the longer you get.

Clint

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01-04-2010 10:06 PM  7 years agoPost 7
zennnnn

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Los Angeles

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On my scale MD500 equipped with an OS37, I used a fuel pipe with a slightly wider diameter than a deflector to route the exhaust to the rear of the fuselage with no apparent power loss. Pipe length used is approximately 7-8 inches.

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01-04-2010 10:32 PM  7 years agoPost 8
Raptor Pilot

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Northern Ireland U.K

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I have put on longer exhaust deflectors and never had any problems with them. I did notice i had to lean the engine a couple of clicks more as there seemed to be more back pressure in the fuel system.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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01-04-2010 10:45 PM  7 years agoPost 9
RcNutTz

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Chicago Illinois USA

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Raptor Pilot I have put on longer exhaust deflectors
how long have you bin using them? Since you have it installed have you had any engine trouble at all?

yes dear the hobby shop again

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01-04-2010 11:27 PM  7 years agoPost 10
Raptor Pilot

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Northern Ireland U.K

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RcNutTz, i have been useing them on helis and planks for over 15 years now and have had no trouble with them at all. I have seen other guys useing them and they did have some bother getting the engine to run smoothly. Mabey im just lucky.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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01-05-2010 12:32 AM  7 years agoPost 11
Dilbeck

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Springdale Arkansas

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I look at things this way sometimes, We use an exhaust on our cars with long pipes trailing out the back so why would this be any different?

Clint

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01-05-2010 12:33 AM  7 years agoPost 12
cudaboy_71

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sacramento, ca, u.s.

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because we fly 2-stroke engines

if it ain't broke, break it.

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01-05-2010 12:47 AM  7 years agoPost 13
GMPheli

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W. Bridgewater, MA USA

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How many dragsters do you see with long exhausts?

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01-05-2010 12:52 AM  7 years agoPost 14
Dilbeck

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Springdale Arkansas

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How many dragsters do you see with long exhausts?
How many helis do you see with only headers and no exhaust??

Clint

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01-05-2010 01:10 AM  7 years agoPost 15
Terrabit

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Seattle, WA - USA

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Theoretically, you could make small adjustments to the power band by manipulating back preasure. At least you can with some engines.

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01-05-2010 01:13 AM  7 years agoPost 16
Terrabit

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Seattle, WA - USA

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Generally, tuning the length and diameter of the exhaust will move the power band up or down the rpm range.

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01-05-2010 01:13 AM  7 years agoPost 17
airdodger

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Johnston USA

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Go to the bolly book and see what they say about stingers.

Chris

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01-05-2010 01:23 AM  7 years agoPost 18
GMPheli

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W. Bridgewater, MA USA

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How many helis do you see with only headers and no exhaust??

Open exhaust is how we ran our airplanes for years, (and one of the reasons I don't hear so well!) mufflers came along for noise control. Mufflers generally restrict power to some degree. Tuned exhaust is another story.

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01-05-2010 01:48 AM  7 years agoPost 19
Dilbeck

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Springdale Arkansas

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Open exhaust is how we ran our airplanes for years,
Im not qualified to answer back due to lack of experience of the subject matter. I do wonder though how our fuel pressure is supplied to the tank with a strait header. On another note I took off my muffler on a car I owned back in 1977 and it would barley get down the road. Put the muffler back on and it was a screaming demon. I think this particular car/engine with all the smog control was designed to have some back pressure to run correctly. To this day I still could not figure it out.

Clint

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01-05-2010 02:20 AM  7 years agoPost 20
RcNutTz

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Chicago Illinois USA

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Dilbeck I took off my muffler on a car I owned back in 1977
to much air in/out not enough fuel to support it

On my hot rod truck I got electric dumps in the exhaust so i can run open headers but the engine is EFI and knows it need more fuel lol

I drop 0.3 of my et's just by hitting a switch

yes dear the hobby shop again

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HelicopterMain Discussion › Exhaust exit
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