RunRyder - a question about exhaust deflectors

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Beginners Corner > a question about exhaust deflectors

RaptorHelius
Senior Heliman
Location: Regina, Saskatchewan, Canada

?

What effect do exhaust deflectors have on the engines? How does length effect it? The reason I ask is.. I want to make a deflector tube that goes right to the end of my tail boom. Is that possible? What effect would that have on the heli or engine?

Thanks

RaptorHelius!!!

Raptor 30, OS32SX-H, Hitec Eclipse 7, Telebee 701 HH gyro.

04-19-2002 Over year old.

deckerv
Veteran
Location: Wellsville, NY

I would think that it'd create too much backpressure and flood the engine, but I may be wrong. It worked that way on my planks anyway.

04-19-2002 Over year old.

HOMEPAGE

RaptorHelius
Senior Heliman
Location: Regina, Saskatchewan, Canada

does anyone know? if I used a larger diameter hose it should'nt make much back pressure would it?? Somebody must know...

04-19-2002 Over year old.

ChrisMoore
Senior Heliman
Location: Bay Village, OH

on four stroke engines the length is not as big of an issue as it is on a two stroker. however, the typical length exhaust deflector (2-3 inches) wont affect the engines mixutre at all. Exhaust Deflectors dont seem to keep the heli any cleaner, for planks, the deflectors make cleanup much easier, on helis, the exhaust lubricates my T/R =)

chris

04-21-2002 Over year old.

fourstarforty
Senior Heliman
Location: Chilliwack BC Canada

deflectors

At our field we have a noise problem, the motors cannot be any louder than 90db, so alot of us run a tube from the end of the muffler.Some of these tubes are short and some are longer up to about 1.5 feet.Using a bigger prop and the tubes make the engines more quiet.The only thing we find is the motors run alot hotter when a bigger prop is used not so much as using the tube.........

04-22-2002 Over year old.

Clearance
Veteran
Location: Left Coast Canada

The exhaust deflector does affect the tuning of an engine/exhaust system. This is especially true of tuned pipes. Using a Helimax tuned pipe on an OS 32 requires an exhaust deflector for optimum performance. I have not notices any effect on a tuned muffler. KSJ designs their 60 size competition deflectors with a spiral ridge inside so that the exhaust smoke comes swirling out. I was told by the distributor of KSJ products that it was intended to impress the judges :=)

Ken

04-25-2002 Over year old.

Augusto
rrAdvertiser
Location: San Diego, CA

I run them in all my helis and they do make a difference in noise and cleaningness.

Avant Aurora Ultimate

04-26-2002 Over year old.

jeflies
Heliman
Location: Suffolk, VA

Hey,

I use a 5/8 inch diameter auto heater hose on mine. It is about 8 inches long. I havent had any trouble with the engine having it on there. It keeps the heli VERY clean.

Jesse

04-26-2002 Over year old.

Doug
Elite Veteran
Location: Naples Florida....

If you are using a "long" deflector the important thing is to "disrupt" the "primary" "wave". Using large dia. does this because the wave velocity causes the pressure to be below ambient and air enters the pipe during each pulse eliminating unwanted reflections. Putting a small hole in the "pipe" next to the muffler/pipe outlet will accomplish the same thing. the amount of "leakage" will be unnoticeable.

04-26-2002 Over year old.

RaptorHelius
Senior Heliman
Location: Regina, Saskatchewan, Canada

thanks!

That's what I wanted to know.. I'd like to run the hose or something further back toward the tail to help keep the heli clean. Could it be run all the way back and exit behind the tail?

Somebody mentioned that it helps keep it quieter too?

Take Care

04-26-2002 Over year old.

Doug
Elite Veteran
Location: Naples Florida....

Try it and let us know

04-26-2002 Over year old.

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Beginners Corner > a question about exhaust deflectors

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