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HelicopterMain Discussion › Long tuned pipes/mufflers?
01-26-2007 01:43 AM  10 years agoPost 1
Tommy Z

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Lubbock, Texas

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Every now and then I run across a picture of a heli with a pipe that goes past the tail servo on the boom and slants upwards...What exactly do these longer pipes do? Are they mainly for drag helis, or other purposes?

Tommy

-Tommy Boy

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01-26-2007 01:52 AM  10 years agoPost 2
ADRYAN

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Stouffville, Ontario, Canada

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sucks... was a hell to tune and it only liked high rpms...
though it looks good.

a

.

DYNAX/OS91 : 9303/S649pcm : GY601/9251 : CSMRL10/9253 : 7.4vLipo/Regulator : KO2123s(ai/el/pi)

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01-26-2007 01:52 AM  10 years agoPost 3
marc8090

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Long Island, N.Y.

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Tuned pipes can make alot of power but are usually tuned by length to a certain rpm. Mufflers are generally easier to tune, and you simply use more nitro to make the power.

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01-26-2007 03:40 AM  10 years agoPost 4
dchekas

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Farmington, CT

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I think they look hideous. Looks like someone took a muffler and bent the crap out of it : Give me an MP2/Hatori anyday!

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01-26-2007 05:02 AM  10 years agoPost 5
ESWLFSE

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Liberty Hill, TX

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I guess it depends what you're used to looking at. ^^^

I love the look but I have always raced cars/boats. Heli mufflers just seemed so low-performance to me so I had to have a "real" tuned pipe/coupler/header on mine. I researched the setup and length quite a bit on some European forums and it seemed to outperform my SB-18 last fall but it definitely needs more testing. The engine floods very easily though.

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01-26-2007 05:10 AM  10 years agoPost 6
Gearhead

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Vt

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here's one..

http://www.westonuk.co.uk/index_048.htm

Jim

Jim
Buzz Buzz Buzz

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01-26-2007 10:07 PM  10 years agoPost 7
Tommy Z

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Lubbock, Texas

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Oh cool

Thanks guys.

Tommy

-Tommy Boy

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01-26-2007 11:20 PM  10 years agoPost 8
Bart B

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chicago illinois

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Tommy,they're also used for making stills

.
.
.
.
Tommy

Tommy

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01-27-2007 01:30 AM  10 years agoPost 9
Tommy Z

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Lubbock, Texas

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Haha,


You always have something 'extra' to throw in to make it better.

Tommy

-Tommy Boy

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01-27-2007 02:00 AM  10 years agoPost 10
MattUK

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Lancaster, UK

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Tuned pipe for me too, Hatori 970

Matt.

----
Light travels faster than sound. That's why some people appear bright until they speak.

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01-27-2007 02:29 AM  10 years agoPost 11
Tommy Z

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Lubbock, Texas

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Geez!

That's huge

Tommy

-Tommy Boy

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01-27-2007 02:39 AM  10 years agoPost 12
shuttlepilot

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Mullins, South Carolina

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It's the way to get power without having to run the high nitro. Most folks could not believe I was only running 5% through my 46. I have the same tuned pipe as what is shown above.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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01-27-2007 03:17 AM  10 years agoPost 13
Tommy Z

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Lubbock, Texas

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Cool

So what happens if you run 30% and use the tuned pipe?

Tommy

-Tommy Boy

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01-27-2007 09:07 AM  10 years agoPost 14
DS 8717

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Here wishing i was somewhere else

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YS 50 likes a pipe better than a muffler.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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01-27-2007 11:36 AM  10 years agoPost 15
MattUK

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Lancaster, UK

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Cool

So what happens if you run 30% and use the tuned pipe?
..It pulls like a ba***rd lots of power at your finger tips

I use the Standard SZ with 2 shims on 30% using the Hatori 970 tuned pipe and it's very poweful, good results so far.

Matt.

----
Light travels faster than sound. That's why some people appear bright until they speak.

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01-27-2007 01:13 PM  10 years agoPost 16
Yug

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UK. Herts

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Often thought about using a tuned pipe as I've heard reports that they really do produce alot of power with low(ish) nitro.
What would anyone recommend for a 50 Hyper ?

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01-27-2007 01:19 PM  10 years agoPost 17
Bart B

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chicago illinois

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I was thinkin the same thing.Lower nitro=longer life?

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01-27-2007 01:45 PM  10 years agoPost 18
nivlek

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Norfolk England

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Often thought about using a tuned pipe as I've heard reports that they really do produce alot of power with low(ish) nitro.
What would anyone recommend for a 50 Hyper ?
One of the Weston Genesis pipes would be a good choice . I have a Genesis full tuned pipe for the old 46FHX , but unfortunately it is too restrictive to work on the 50 (I tried and failed). I've also used pipes intended for fixed wing models wthe good results , a clubmate has one of those cheap Just Engines "Purple Pipes" bolted onto a Rossi 65 in a SkyFox , and that performs great on straight fuel .

The long tuned pipe can also act like a governor . Basically you set the tuned length slightly on the long side , then if you load the engine up and the revs begin to decay , the engine comes "on the pipe" and you get a bucket load of extra power . If you unload the engine and the rpm's increase , then the engine goes further off the pipe and losses power which , in turn , limits the rpm .
Using a full tuned pipe as well as a governor can cause problems if the desired headspeed and the tuned length of the pipe are not pretty close .

A good twin cone pipe can be worth 30/40% more power on a sport engine . It might also be worth raising the exhaust port timing by a few degrees to get some extra boost .

At the end of the day , it gets dark .

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01-27-2007 04:43 PM  10 years agoPost 19
Yug

rrMaster

UK. Herts

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Thanks for that. This raises a couple of questions,
What effect does a tuned pipe have on the mixture ?
Does a tuned pipe have a high Q ?

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01-27-2007 05:04 PM  10 years agoPost 20
nivlek

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Norfolk England

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The mixture itself , ie fuel to air ratio , still needs to be the same as with a muffler . However , whether you would need to richen or lean your needle settings compared with your current exhaust system would depend on the backpressure supplied by the pipe to the fuel tank , which would depend on the placement of the pressure nipple , the volume of the pipe/silencer , the length and diameter of the stinger etc .
Also be aware that if the pipe is too long , it can give similar symptoms as the engine running too rich and vice-versa .

If you do a search for the "Bolly Book" , it shows you how to calculate the correct pipe length for the type of pipe (twin cone or flat plate reflector) and rpm that you are want to run at .

At the end of the day , it gets dark .

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HelicopterMain Discussion › Long tuned pipes/mufflers?
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