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Looking forward to pictures of the finished boat James.
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IMPBA 20481S D-12 -
Unreal. Keep it up!Comment
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Hi James,
yes my exhaust system is fully divergent but I did some other tweak, hopefully works as desired. For preventing of hot gasses flowing back into the stopped engine, I think that solution is already included from JetCat. I'd guess you have the ECU with the older software for the cooling down. Which means like it is 5-6 seconds stopped, then for 3-4 seconds the electric motor gives some cooling and that process repeated. Basically a pulsed process, seems as that one created some troubles.
They now changed that to a permanent cooling, immediately after the 1st stage stops, the E-motor jumps in at 4000rpm and provides permanent cooling till the inner temperature is below 100° Celsius. At land when the prop shaft can spin unloaded, the electric motor will already start when the 2nd stage is still a little running from its momentum of inertia.
So can't imagine that with the updated system hot gasses can flow back to the compressor stage, therefore I didnt take that into consideration for the exhaust system.
regards,
ManuelComment
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@Manuel
2 putties, Pyro-Putty® 950 and Resbond™ 907GF. Not sure what your sealing solution is and if you will have any down draft concerns. It molds and dries to any shape beautifully and neatly. The Resbond is preferred over the pyro putty because it can be removed with a bit of effort cleanly and works perfectly for sealing any gaps and imperfections the exhaust duct may have when mated to the modified Turbine exhaust. It prevents downdraft bleeds, which in my case was a problem and baked a small portion of the hull in one spot, I caught it so no damage, still I have decided to put a 6oz Kevlar/cf mix in the high heat area using some epoxy resin made for JetA and Kerosene, Max GRE, Chemical list shows gas, jet fuel and kerosene resist as excellent.
I have to talk to Jetcat here about the new programming then as I do have the older ECU, it sounds like they did it right this time. Mine still does the short runs and is inefficient.Comment
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Hi james I've seen much. but that is perfect. I think you need next also a probation officer hahahaha
greetz hanspeterComment
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Finally roughed up the interior and cleaned the remaining FE dust out. Fitted a brown paper mockup of the main mechanics area several times until I got a proper fit. Sprayed some 6 oz Kevlar/CF mix with Aquanet (prevents fraying) and let it dry, then cut to shape. I then used Max GRE-R, a purpose made epoxy for areas using Jet-A or Kerosene and high heat, such as aircraft engine compartments APU enclosures etc. After wetting the area I fitted the single large piece and began the hour job of laying the new substrate down...at which point one of my Korats got curious....with no warning Tom jumped from the floor into the boat onto the new, very wet Kevlar....with the same speed he landed he jumped out and in the process snagged a thread of Kevlar with his claw and B-lined it to a hiding place I couldn't find him.
I had to slowly work the thread back in and all but a tiny 1/8 bunch went back down but the damage is done, I have a perm blemish just over a foot long. So I though take the monstrous piece back out or leave it lay since it went in and looks relatively ok, I decided to leave it and used vacuum bagging material on the surface and edges to seal them and let it dry. Not bad. I can still hear my cat trying to mew and apologize, I have a soft heart, so I didn't kill it. Grin.
I also fitted, cut and installed the aluminized Kao-wool to both sides, pics included, 8oz total weight for the two pieces. The Kevlar installed is 11 ounces with resin by weight. Also included is a picture of the perpetrator, Tom is the front cat.
newdeck.jpgcfandprep.jpgbaggingit3.jpgintake3.jpgperpetrator.jpgComment
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Aluminized Kaowool install. This isn't all the heat shielding, though it is the two largest pieces.Comment
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Just got the estimate from Pyrosic on my exhaust ducts and I do not think I will be using their solution. A quote of 12-23 thousand dollars, included retooling and cutting the exhaust ducts up as they said using it as a coating would not work so they said they would have to use my ducts as plugs, I told them no and to forget the whole thing and to send my stuff back. WOWSERS, as Scooby Doo would say.
They said their type of business was for "People with the proper budget".......I laughed.Comment
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