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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Zimmerman Rear-Mount Muffler for Spectra-G
09-16-2009 06:52 AM  11 years ago
SeismicCWave

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Hilo, Hawaii

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>>Now that seems excessive...is that really necessary?<<

That is excessive. I used two wrap and it stay put. Some of us have good luck with the exhaust coupling and some has bad luck. The excess is to chase away the bad luck. Unfortunate for me the coupler didn't move but it simply melted. The teflon coupling shown was not the one melted. I had a red silicone one that melted.
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09-16-2009 12:41 PM  11 years ago
Justin Stuart (RIP)

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Plano, Texas

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Why the resistance to using hose clamps?Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives
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09-16-2009 12:55 PM  11 years ago
carpman

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Spain

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If I could make a decision on what tubing to buy I would use Stainless T Bolt Clamps, similar to ordinary hose clips...

Malc you flown with the silicone tube yet?
KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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09-16-2009 01:03 PM  11 years ago
shawmcky

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Why the resistance to using hose clamps?
Beats me,they fit those compression type clamps on a lot of motors now and in the most awkward places to get at as well,give me a screwdriver clamp anytime,i think it is that the clamp type are quicker and cheaper to fit on a production line.
Team- unbiased opinion.K.I.S.S principle upheld here
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09-16-2009 01:58 PM  11 years ago
chilibean

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cape may,n.j.usa

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clamps
I used the white teflon and compression clamps that came with mine and both worked fine for over four gallons. What failed was one of the mounting flanges broke off. I'm now using zimmerman side mount like Raja.
Paul
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09-16-2009 03:14 PM  11 years ago
AceBird

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Utica, NY USA

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Why the resistance to using hose clamps?
Because spring clamps will not loose their clamping power when the pipe expands and contracts during normal use. A fixed clamp will loosen up.
Ace
What could be more fun?
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09-16-2009 03:33 PM  11 years ago
rbort

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Franklin, MA - USA

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Generally speaking
You need the gap to be as small as possible between the two pipes for a coupler not to melt, or at least the smaller the better. The teflon does very well, the silicone is much more affected by the gap between the two pipes.

I've used teflon on my 1005 muffler for years, some did bulge out but held, others did eventually develop a small leak but that was after 100rd's of flights. Nowadays I'm using the Vario black coupler on my 1005 and that material is stiffer and seems to be stronger as far as not melting or bulging out.

While I managed to seal the joint with a coupler no problem, my biggest problem with this muffler was the cracking on the mounting flanges or inlet pipe which sprung leaks. The final nail in the coffin was when the rear A frame cracked at the thinnest point (spark plug boot relief). Check yours periodically and make sure that isn't happening otherwise the model will shake and have all sorts of issues that you think are related to something else while in fact they are due to a cracked rear A-frame.

Ace makes a good point that is logical.

-=>Raja.
MA 1005 Hanson 2703D, 4400 flts
Spectra 27 3DMax, 3460 flts
Whiplash V1-2 Hanson 300, 1995 flts
Whiplash V2 Hanson 300, 923 flts
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09-16-2009 06:16 PM  11 years ago
SeismicCWave

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Hilo, Hawaii

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>>Why the resistance to using hose clamps?<<

>>Because spring clamps will not loose their clamping power when the pipe expands and contracts during normal use. A fixed clamp will loosen up.<<

Acebird pretty much summed it up. I just like to add that you have to adjust the hose clamp every so often because of vibration and thermal problems. Hose clamp can also leads to over tightening when adusting. Hose clamps also create uneven pressure on the coupling.
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09-16-2009 06:40 PM  11 years ago
shawmcky

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Oh i see
so a spring clamp wont creep,gotcha now
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09-16-2009 07:10 PM  11 years ago
shawmcky

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You mean all the screw up clamps i have ever fitted to aircraft engines are no good
There must be a few Lycomings flying around that i will have to recall.

Team- unbiased opinion.K.I.S.S principle upheld here
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09-16-2009 07:40 PM  11 years ago
Malc1

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EVESHAM,UK

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Just come in after taking the heli down the flying field.
The weather is blowing a storm over here so only just managed to get one tank of fuel though before packing up and coming home.

Well, even though I`ve only had one tank through it the heli is back home the cleanest its ever been.

Just a couple of odd specks here and there which look to have come from the end pipe of the muffler.

The silicon tubing arrangement is exactally as it was when I went out.The clips may have bedded in to the silicon slightly but thats it.

Nothing has moved and nothing has leaked and all is clean.

Usually a problem would have been noticed from the first few minutes of flight.

The heli now needs to be taken out again,maybe tomorrow and some more fuel run though to see if anything changes.

BTW I managed to ring the guy selling the blue tubing today,it seems that this stuff he is selling is only rated at 170 degrees C.
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09-16-2009 07:41 PM  11 years ago
Fixit

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UK

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Nice, Now I would love to do a conversion with one of those

Garden Hose clips work fine for me also
I only like to fly gassed up
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09-16-2009 07:47 PM  11 years ago
shawmcky

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Fixit
Thats right Peter they do actually work, after all, you can,t have a hose falling off at 3,000 ft.
Team- unbiased opinion.K.I.S.S principle upheld here
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09-16-2009 07:49 PM  11 years ago
Justin Stuart (RIP)

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Plano, Texas

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I used the white teflon and compression clamps that came with mine and both worked fine for over four gallons. What failed was one of the mounting flanges broke off. I'm now using zimmerman side mount like Raja.
Did Alex give you a discount on the side mount?
I managed to ring the guy selling the blue tubing today,it seems that this stuff he is selling is only rated at 170 degrees C
I think if it was going to melt, it would have melted on the first flight. I think you've got a winner here. Too bad nobody can find the reinforced tubing.
There must be a few Lycomings flying around that i will have to recall.
I've used hose clamps on many RC airplane headers/tuned pipes over the years, and although the hose clamp does dig into the silicone, it also lasts a very long time with absolutely no problems. I think a pair of nice stainless steel hose clamps would be just fine for this application.
Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives
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09-16-2009 07:56 PM  11 years ago
Fixit

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UK

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Thats right Peter they do actually work, after all, you can,t have a hose falling off at 3,000 ft.
shawmcky

Not an easy mend at any height I would imagine

After the first flight I just nip the clips up and that’s it, no more maintenance needed.
I only like to fly gassed up
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09-16-2009 08:09 PM  11 years ago
SeismicCWave

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Hilo, Hawaii

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>>You mean all the screw up clamps i have ever fitted to aircraft engines are no good
There must be a few Lycomings flying around that i will have to recall.<<

If you noticed none of the clamps you showed on your photographs were subjected to the direct exhaust heat. You are also putting the clamp on materials that are considerably thicker than what we use in RC models.
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09-16-2009 08:21 PM  11 years ago
carpman

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Spain

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I understand the theory of the clips supplied with the exhaust, that they expand when the exhaust heats up and contract when it cools. So does that means if it leaks then it will leak hot or cold

Whereas a hose clip/t clamp you can tighten it up when cool so when the exhaust expands it will improve the sealing properties?

Same theory as our exhausts, we put them on and nip them up when hot...

Who cares, do what works for you and both methods seem to work for folks here...
KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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09-16-2009 08:41 PM  11 years ago
shawmcky

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Isle of Wight,United Kingdom

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Whatever works for you
is all that really matters.
Team- unbiased opinion.K.I.S.S principle upheld here
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09-16-2009 09:51 PM  11 years ago
AceBird

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Utica, NY USA

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Who cares, do what works for you and both methods seem to work for folks here...
Could you say that about everything you do to the heli, who cares? I guess it matters to those that are looking for better ways of doing things and the "why" they are better. Hose clamps will work to some degree in certain instances but in this application a properly designed spring clip will work better. A hose that cannot take the heat is not great in the first place.
Ace
What could be more fun?
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09-16-2009 10:02 PM  11 years ago
carpman

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Spain

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OK Ace so despite me acknowledging the fact that hose clips work for some and spring clips for others your assessment is that the latter is the only way, well how come it don't work for everyone, hence why "who cares" is limited to those that do not have an issue whichever they use...

Don't turn it into a general "who cares" about everything heli related we are on a topic here and not generalising...

We are trying to find a solution to a problem, I am open to either solution here as mine doesn't work either. I guess if we don't do it the Ace way then there is no other way
KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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