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Old 08-29-2009, 02:18 PM   #11
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Re: HomeMade Jet engine

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You also may want to try rcgroups.com, rcuniverse.com ... many more modelers on those sites.
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Old 08-29-2009, 04:34 PM   #12
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Re: HomeMade Jet engine

I have built the KJ66 and it is not an easy task unless you have the right equipment. Your problem is going to be the 66mm turbine as they are very scarce. Wren used to have them but quit making them several years ago and I do not know if anybody is carrying them now. I need a turbine for myself and if somebody has a 66 I would also be interested.
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Old 08-29-2009, 08:54 PM   #13
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Re: HomeMade Jet engine

Well I know a guy who has done it. Started with absolute nothing but an existing design (JPX). The original is made of aluminum and stainless steel. He built his from magnesium and titanium. Weighed 1 lb less. Even built a titanium propane fuel tank (the JPX used propane). Reverse engineered the whole thing then debugged issues like bearings and differential expansion of materials. Couldn't interest him in calculating the expansion issues, he just kept making new parts with different fits until it all ran like a charm.

Then he started with his own designs. Same thing, just thinks them up, builds, debugs and they work. So far has a 35 lb, 6 lb micro, 55 lb thrust 'core' engine and a two spool turbofan of undisclosed thrust.

Now he has never cracked a book on turbine design or combustion theory. I know cause I have bought some for him. They still sit on my shelf. He has opened up lots of engines, and talked to lots of designers/other geniuses but the designs are all his own.

As for tools all he uses is a very high quality NON CNC lathe, mill and home made EDM and balancer. Look into EDMing and consider each side of a 30 odd blade turbine wheel consumes about 7 electrodes per blade. Got the blade angle not quite right? EDM up another and test. Remember each EDM electrode is hand made and burned out by use. Machining high nickle alloys is not an option for these wheels. Casting? Know anything about vacuumn casting aerospace alloys then subjecting them to hot isostatic pressing? Look into it, we have, and EDMing does start to make sense on these limited production runs.

Well if you are one of the top dozen turbine designers in the world and can match it with absolute genius level of skill in machining, testing, de-bugging and re-machining go for it. Frankly even he started with an existing design and went from there. If you have to do it ALL yourself the Shrekerling FD would be a great place to start. The only things you can buy are the bearings. All the others use existing turbo charger (not supercharger sorry Bruce) components heavily modified as a start.

If you want to see what unbelievable stuff he has done look up Pegasus on RCUniverse. Go deep enough and it will blow your mind. See the 'Hot Spec' and the turbine killer bee, especially the turbo prop version. Check out You tube videos on the bee.

Good luck, meant as sincere, it can and has been done but it is a long hard slog even for the genius.

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Old 08-29-2009, 09:10 PM   #14
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Re: HomeMade Jet engine

Hi ; Check out Traplet Publications in England.

They sell a book by Dr. K. Schrekling ( spelling ?) that shows you how to build a simple small turbine from street available parts.

You will have to buy the electronic controller though , FADEC ( Full Authority Digital Engine Control).

There are turbine kits out there as well.

Good luck.
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Old 08-30-2009, 10:07 AM   #15
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Re: HomeMade Jet engine

There's a guy making all the parts for the kj66 turbine and he sells them on ebay. Not to sure about quality control .
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Old 09-02-2009, 11:15 AM   #16
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Re: HomeMade Jet engine

Ok, i read all u wrote.
And i wand start with the most "simple" jet engine to build=pulse.
Well, if you describe/write the list of the parts , your welcome!!
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Old 09-03-2009, 09:42 AM   #17
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Re: HomeMade Jet engine

Very cool man, very cool. I can't help you out but man, its good to see a guy wanting to learn from the ground up. Good luck.

Hey Buddy, thats a Kadet not an Extra!!!
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Old 09-05-2009, 06:00 AM   #18
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Re: HomeMade Jet engine

Does anyone has CADs??
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Old 09-05-2009, 03:08 PM   #19
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Re: HomeMade Jet engine

Originally Posted by pedfoot View Post
Does anyone has CADs??
Try http://reviews.ebay.com/What-about-P...00000002108447

this is a starting point.

There are poeple who sell pirated copies of designs for these on eBay, but if you're going to make your own, the hard part of the design is the valve that regulates the airflow into the burn chamber. Works like a one-way flap as the ignition of the air-fuel mixture will force it closed until the burned gases pass out ofthe burn chamber and the cacuum draws in a fresh charge.

A pulse-jet engine is essenstially a pure two-cycle motor in a tube.

Speaking of which, here's a pulse-jet forum

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