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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Zimmerman Rear-Mount Muffler for Spectra-G
09-16-2009 10:59 PM  11 years ago
Justin Stuart (RIP)

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Plano, Texas

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Any more flights Malcolm?Avant RC
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09-16-2009 11:13 PM  11 years ago
Malc1

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EVESHAM,UK

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No only the one tank through today - the weather is not too good and it gets dark pretty early as well.(before 7.45pm)

Its lucky she handles the wind well or I wouldn`t even have done that.
Maybe tomorrow.
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09-16-2009 11:53 PM  11 years ago
Justin Stuart (RIP)

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Please keep us informed. I am curious to know how long that coupler last.Avant RC
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09-17-2009 12:01 AM  11 years ago
Malc1

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EVESHAM,UK

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So do I
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09-17-2009 05:57 PM  11 years ago
AceBird

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Utica, NY USA

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I guess if we don't do it the Ace way then there is no other way
Sorry you see it that way but if you want to eliminate the problem altogether the coupling cannot be made of a plastic that cannot withstand 900 degrees. If you are happy changing it every so often then so be it.
Ace
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09-17-2009 07:11 PM  11 years ago
carpman

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Spain

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We were talking about the clips not the hose...KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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09-17-2009 08:49 PM  11 years ago
Malc1

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EVESHAM,UK

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Oh well it could be expected I suppose

Been down the field with the Spectra and tonight have managed 2 1/2 tanks through the engine - then things ground to a halt.

I heard it go and saw the metal insert fly out somewhere.

Got the heli down as I wasn`t that high as the engine decided to go seriously out of tune.

Anyway I`ve pulled the header and muffler for the third time this week and now need to decide my next option.

Its not been leaking and it hasn`t moved though
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09-17-2009 09:16 PM  11 years ago
carpman

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Spain

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Oh dear Malc, thanks for doing the experiment though its saved some of us some money

So what next do you think, buy a side mount?

If it wasn't for keeping this flexibility between the 2 parts I would be tempted to get a piece of steel welded in.

My steel hose was rubbish, are there any better steel type hoses out there? I found some flexible joints used in the auto industry but none would have fit our applications...

Next course of action...........?
KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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09-17-2009 09:25 PM  11 years ago
SeismicCWave

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Hilo, Hawaii

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It may be time to experiment with copper plumbing parts. Try to find some compression fitting and copper pipe. At least copper is maleable that you can bend it a little to fit.

Apparently silicone is simply not design to withstand such high heat and pressure.
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09-17-2009 09:48 PM  11 years ago
Malc1

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EVESHAM,UK

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Well actually.........I have this that has come today.

A 250mm length of 25mm external diameter Teflon rod.

As mentioned previously in the thread.

I need to take some measurements and go out and find someone who can machine some pieces for me putting a step down either end to stop it slipping.

I also have Alex at RCMarket looking for a solution with a different length header pipe - to close that gap up.
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09-17-2009 10:40 PM  11 years ago
pgkevet

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Wales

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..sounds like a project for the local school machine shop
It'll probably cost you an eight...
pgk
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09-17-2009 10:48 PM  11 years ago
Malc1

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EVESHAM,UK

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Yeah I wish my son was still at school - be a great help
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09-17-2009 11:00 PM  11 years ago
AceBird

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Utica, NY USA

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We were talking about the clips not the hose...
Yes, you and I were discussing the clips but the failure of a fixed clip is due to the failure of the hose which is due to the high heat. If you were talking about a rubber hose on a water pump it is a different story. The water limits the temperature to around 212 and stays pretty consistent.

If you want to use a hose clamp do it. I tried to answer the persons question as to why a spring clip is better. Not that it is fabulous but it is better.
Ace
What could be more fun?
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09-17-2009 11:49 PM  11 years ago
Fixit

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UK

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Malc1

Well that split good and proper I can see now it wasn’t reinforced like the stuff I bought on eBay, the stuff I used stood up to 6 or 7 flights before I fit the side mount and it still looks unmarked.

The offer still stands if the Teflon doesn’t work out
I only like to fly gassed up
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09-18-2009 01:05 AM  11 years ago
Justin Stuart (RIP)

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Plano, Texas

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How much did that piece of Teflon cost you?
the stuff I used stood up to 6 or 7 flights before I fit the side mount and it still looks unmarked.
Any chance you can find the reinforced stuff for sale?
So what next do you think, buy a side mount?
Anyone think Alex will offer to exchange Malc1's rear mount for a side mount?
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09-18-2009 01:15 AM  11 years ago
Malc1

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Thanks I`ll let you know.

As I think I said in an earlier posting the header to muffler gap is between 35 and 40mm wide and I don`t think really it should be.

I have emailed Zimmerman direct tonight and RC Market again to see if they can supply me with a longer header possibly with the view to getting that gap closed up and more in align.

I think that with a smaller gap you could use some of the things that have been tried more effectively.

I await their reply.

I still have the Teflon to work with,another length of that blue 170 degree rated silicon and something else that came today.

A length of 350 degrees C rated metal reinforced silicon - possibly worth a try with a different header.

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09-18-2009 01:20 AM  11 years ago
Malc1

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That Teflon worked out to be £7.37 delivered
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09-18-2009 01:34 AM  11 years ago
gramey

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United Kingdom

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Malcolm at the risk of being totally ignored again if you look at this - http://www.rcmarket.org/spectra-g-m...1-pr-21488.html
and then this -
http://www.rcmarket.org/z2620x-gas-...p-1-pr-160.html
you'll see that the headers are a completely different length and each set is shown with only a single means of connecting the two, although others have received both the flexible coupling and the teflon.
I appear to have received the 1005 header & coupling with the Spectra muffler. I was originally intending to send the header back as it was too long but I'm glad I didn't and just ended up cutting it down. I was also a little miffed that I got a grotty looking 'plastic' tube to connect them up with but again,so far, this appears to be a blessing in disguise.
The problem with the header is the need for clearance with the canopy to stop it melting. Ideally Zimmerman need to modify the inlet to the muffler so it comes out slightly further to meet the header square.
May I suggest Malcolm that if Zimmerman or RC Market are not prepared ot come up with a better solution that they at least send you the 1005 header which you can then shorten to an acceptable gap and then use your teflon.
I would however be wary of making your tolerances too tight with regard to putting a step in it so as not to make it too rigid. As for mine with the stock teflon connector, and having lost the 'knurling' on the header when I shortened it, I've had no leaks or creeping so far. It doesn't look like it will last forever but so be it.
This will probably come back and bite me in the backside and split on the next flight out!
Dumb thumb specialist
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09-18-2009 02:30 AM  11 years ago
Justin Stuart (RIP)

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Plano, Texas

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Ideally Zimmerman need to modify the inlet to the muffler so it comes out slightly further to meet the header square.
Ha ha ha... You make me laugh.

I tried for months to get them to do this. We even talked Raja into sending his whole muffler to them with measurements and everything--and you know what we got? Nothing. Just a big FU.

So don't hold your breath.

Malcolm, I'm interested to see how well that new silicone header works. Thanks for finding that for us. Are you willing to try it with your metal coupler installed in the center while you're waiting for a new header (which will probably take 6 months)?
I have emailed Zimmerman direct tonight
Can you give us the email you used? They have never responded to any emails I sent to them so good luck with that one. By the way, if Alex learns that you mailed Zimmerman directly he will get real upset with you.
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09-18-2009 02:59 AM  11 years ago
Fixit

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UK

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Any chance you can find the reinforced stuff for sale?
It looks like this stuff advertised on eBay

http://cgi.ebay.co.uk/ws/eBayISAPI....e=STRK:MEWAX:IT

I think the 350 degrees C rated metal reinforced silicon Malc1 has might be the one to watch out for.
I only like to fly gassed up
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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Zimmerman Rear-Mount Muffler for Spectra-G
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