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Tuned Pipe vs standard muffler

Old 12-10-2006, 02:22 PM
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Default Tuned Pipe vs standard muffler

I have a MVVS 35 cc in a Seagull Edge 540 (120 - 180 cu inch size), I have done some mods to the fire wall to take the engine. I have fitted a smartfly power expander and a fiber optic kill switch. I have fitted the engine and run it on the ground (two tanks) with the standard muffler. I'm in the final stages of fitting the cowl, what I would like to know is what advantage am I going to get from using a MVVS 3268 tuned pipe on this plane? Secondly any tips on the set up and the "tuning" of the pipe would help.

Thanks for the great tips and advice on this site.
Mike
Old 12-10-2006, 02:51 PM
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Default RE: Tuned Pipe vs standard muffler

ORIGINAL: Miketc

...what I would like to know is what advantage am I going to get from using an MVVS #3268 tuned pipe on this plane? Secondly any tips on the set up and the "tuning" of the pipe would help.
Mike,


The difference in RPM between the tuned-pipe and the #3271 Pitts style muffler is about 800-900 RPM.

The tuned pipe is a cone and disk type, which is more flexible than a dual-cone pipe and will generally work as it is fitted.
You will not have to chop the header, or anything.

The engine will spin about 7,300 RPM on a 20x8 prop with the Pitts and about 8,100-8,200 RPM with the pipe.


Another advantage is that the pipe will be somewhat more quiet and the exhaust fumes will be expelled behind the wing.

This exhaust will not hurt throttle response, like some smaller engines' finicky pipes can.


If you had the #3298/35 'dustbin' in mind; it would get 200 RPM less than the Pitts and it does tend to leak, I am told.

Old 12-10-2006, 03:12 PM
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Default RE: Tuned Pipe vs standard muffler

from http://www.mvvs.cz rpm with props using tuned pipe 3268 + header, pitts muffler 3271, and dustbin muffler 3298. The last indeed leaks, as the two halves are not soldered together. They can be brazed though.
No tuning is required with the original MVVS parts.

engine 35 IFS
APC 20/8 7600-7700 3268
Mejzlik 20/10 7200-7300 3268
Mejzlik 20/8 8200-8400 3268
Mejzlik 21/10 6600-6700 3268
Mejzlik 20/8 7100-7200 3268
Mejzlik 20/10 6300-6400 3271
Mejzlik 20/8 7300-7500 3271
Mejzlik 20/8 6700-6800 3298

These rpm have been reproduced by many in the field.


Old 12-10-2006, 03:22 PM
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Default RE: Tuned Pipe vs standard muffler

Thanks to both Pe and DarZeelon for the prompt response.
I will go with the tuned pipe.
You gents provide a great service to the brand. Well done.

Mike
Old 12-12-2006, 07:01 AM
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Default RE: Tuned Pipe vs standard muffler

Mike

I converted a Top Gun Edge 540 to take a full cannister, its a very simmilar ARTF to the Seagull one and you may be interested in the mods: Link http://www.rcuniverse.com/forum/m_4818397/tm.htm

Also have a look at the thread on it at Top Gun Edge 540: Link
http://www.rcuniverse.com/forum/m_4629728/tm.htm
Mike
Old 12-12-2006, 01:09 PM
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Default RE: Tuned Pipe vs standard muffler

Mike thanks for the link, strange but I have seen this thread some time back. At that stage I did not even think about using the tuned pipe. We do not have to worry about noise levels here in Kuwait, out club is located in a huge "desert" block in suburbia and nobody cares about noise. A handful of guys are even flying motorized Para gliders. The tips you posted on your Top Gun Edge was very informative. The Seagull looks like it comes from the same factory. The video link was also useful. How is the plane flying? I bought my Edge after reading the article in RC Model World. Well here is a punt for them, I bought the MVVS after reading the May 2005 article, the WM Groovy 90 after reading the December 05 edition, the Dave Patrick Ultimate after reading the June 02 edition. I have not renewed my subscription of RC Model World because I have too many planes and not enough space to store them at home. The club allows us storage for four planes, I considered a second membership to store more planes. I love flying, just can't get enough of it..

Cheers,
Mike

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