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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › EXHAUSTing stuff
11-10-2005 06:47 PM  14 years ago
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PETER ROB

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Devon UK

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EXHAUSTing stuff
Hi All I have been having the problem of getting someone to make special exhaust to fit the Wren And JetCat 2 stage so that they can be used and fit into a scale fuselage, I have tried making my own and am very pleased with the results ( see my gallery ) I have been parellel seam welding with a spot welder resulting in the joint having small and I mean small pin prick holes anyone have any idea what I can fill them with besides exhaust cement and will it make a lot of difference as the exhaust will be wraped with heat blanket in the final assembly.
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11-10-2005 11:51 PM  14 years ago
PETER ROB

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Devon UK

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Exhaust
CJ I am fortunate to be retired and have the use of HobbyParts workshops, I designed the shapes for the segments cut them on my vinyl cutter applied them to .5mm ss sheet, then cut them by hand, rolled them on the Hobbyparts sheet bending machine, tacked the joints ground off any imperfections on one of HobbyParts linishing belts, then spot welded them together again using HobbyParts spot welder to give me what you see on my gallery, without the HobbyParts facilities I would not have been able to get these results, Thanks HobbyParts
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11-17-2005 07:12 AM  14 years ago
Ozzy Pilot

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Victoria, Australia

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Hi Guys

Nice work on the exhausts.

Can you please tell me exactly what material you are using and what thickness. I have been trying to purchase 321 stainless steel 0.3mm thick here in Australia but I am having all sorts of problems finding a supplier despite the fact that my brother and I own a stainless steel fabrication business and have good contacts.

Thanks for the help.
Member of Good Guy list (seller) Pg. 23. Turbines - Audile pleasuring
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11-17-2005 10:21 AM  14 years ago
PETER ROB

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Devon UK

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Ozzie Pilot I had the same problem in England my supplier could not get stainless sheet in less than 0.5mm, he said he could get thinner in shim but the price was prohibitive and of course the material was a lot harder, I have an exhaust that came from the USA via Peter Wales and it is paper thin, it appears you can get the thin stuff there, may be a PM to Peter might help
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11-17-2005 11:38 AM  14 years ago
wolfdad

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Southern Maryland

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Peter,
Very nice looking "tubes." I am at the classic point of final installation with my BK and the exhaust system. Hoping to turn/hover this beast within the next week. This is another one of those areas with regard to turbines that I have little knowledge in. All I know is that, if you have a good exhaust and it is working properly, things go well, however, if you screw it up, it's gonna' get real expensive...lots of hot air wandering around a fuselage is NOT a good thing.

wolfdad sends...
"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105
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11-17-2005 12:33 PM  14 years ago
Peter Wales

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Orlando Fl

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My exhausts are made by Tam of Tamjets in California. He is the man and works absolute magic with thin sheet stainless. Jack Martin also can turn out a tube or two so he will be able to help source the stuff over here.Peter Wales
http://scalehelicopters.org
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11-17-2005 01:22 PM  14 years ago
wolfdad

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Southern Maryland

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Jack,
You being the "resident expert" and all on turbine exhausts, what brand/type of heat blanket material have you used and which one do you like?

Peter, I've looked at the Tamjet stuff and it is excellent, however he is awful "proud" of those items. Neat stuff, but expensive.
Doc
"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105
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11-17-2005 04:02 PM  14 years ago
PETER ROB

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Devon UK

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Wolfdad
Wolfdad Thanks for the imput, The reason for the pinholes was as Heli Jack correctly diagnosed was too much heat caused by me using the electrodes as clamps, another factor being that I was trying to butt weld and not lap weld, I have found that when you lap weld there is a heat buildup in the lap area, giving quite high hot spots, this is why I was trying to butt weld, this has now turned out to my satisfaction, as the trial bends are to be used outside the Jet Ranger and the pin holes are minute, I have done some practice butts taking a lot more care and the first results are encouraging, on the other note temperature within the fuselage, I have tried a lot of different methods to keep it down and the best one is to get as much volume of clean air to the turbine it's self, now that the forum is back on line it's good to see a lot more interesting stuff being discussed
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11-17-2005 04:10 PM  14 years ago
wolfdad

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Southern Maryland

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You know Peter, this is another one of those areas with turbines that, unless you are into scale, you really don't delve into much. I know Jack became pretty much an expert in self defense of his wallet last year. On the pod and booms, as long as the exhaust stays attached, we are pretty much satisfied, however, with a scale bird and the exhaust buried in the fuselage, heat dissipation becomes a major issue.

wolfdad sends..
"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105
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11-17-2005 04:11 PM  14 years ago
Peter Wales

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Orlando Fl

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Doc
I haveto work hard to persuade Tam to make heli exchausts as he says he doesn't make any money on them

His latest price for an EC135 exhaust is $1250. Sound a lot? OK, its a custom built 3 layer bifurcated exhaust with twists and turns all over the place. It works so well, mine is actually resting on the paintwork and its not even discolored never mind burned. It weighs 2/5 of nothing.

Compare that to the Vario exhaust for the same model and you'll see why.

You get what you pay for. BTW one of the nicest production exhausts I have seen came from the Graupner NH-90. Similar construction to Tams but not triple wall
Peter Wales
http://scalehelicopters.org
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11-17-2005 04:19 PM  14 years ago
wolfdad

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Southern Maryland

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Peter,
There is absolutely no doubt in my mind regarding Tam's work quality...have personally seen it and nothing compares. As you said, that kind of quality does not come cheaply and he is probably right, with what he has to pay for the skill-set, he probably is making marginal bucks.
Doc
"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105
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11-18-2005 02:06 PM  14 years ago
wolfdad

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Southern Maryland

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For the sake of not hi-jacking this post any further than it already has been, I just PM'ed you with a couple of questions regarding insulation.
Doc
"There are those who have...and, those who will" IRCHA #2117, AMA #70068, Turbine Waiver #105
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