Jett engines... - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-20-2010, 08:26 PM   #11
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I am: Andrew Coholic
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Re: Jett engines...

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Broke in engine #1 today, about 2 1/2 hours of run time on the test stand.

With an APC 9x5 prop, and Wildcat Premium Xtra 15% fuel (with 18% oil, 20/80 castor/synth blend) and a H9 performance 2 stroke plug, this thing was turning over 17,500 rpm, and pulling almost 4.2 pounds thrust!

Transition and idle, awesome. VERY tight... these engines need to be run a minimum of 1/2 hour to even idle decently or they just seize up when they cool down.

With any luck, its going to get put into a Great Planes 1/12 scale Corsair and test flown within a week!

Andrew Coholic -MAAC #26287L

1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's...
if its got a wing or two and an engine - I like it!
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Old 04-21-2010, 05:13 AM   #12
I am: Boolean21
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Re: Jett engines...

Yes beautiful work by a genuinely great company. This years SAE group tried a belt drive with last years two .30 engines and it did not work out. Called Dubb Jett and he built a .65 side exhaust from a .91 block. This long stroke motor fresh on the test stand turns a 15 X 4 APC wide blade at almost 11,000 rpm and 13 lbs thrust. Workmanship is as always impeccable
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Old 06-12-2010, 01:42 AM   #13
Kelly W
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I am: Kelly W
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Location: Delta, BC (122.91W, 49.14N)
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Re: Jett engines...

I also had some experience with Dub's engines in the SAE competition. we ran a few years in the open class on the west coast, and used the BSE 76L rear exhaust for 2 of them. We ran a combination of APC 14x4W props, and a custom pitched carbon fiber bolly prop for the big flights. Both engines were real work horses. We piped them and had an engine core that weighed only a few oz, pulling ~16+lb of thrust.

Dub and I talked about the application, and he said we would either win or the engine would blow up. Its normally only suppose to turn ~11K ish, and we went WAY beyond that... I think the engine was intended for 3D flight applications on a 46 size case.

End result, he was right. We won the 1st year hands down, and came 2nd (but still with the highest weight lifted) in the next year. The only problem we had with the motors was air bubbles seeping into the fuel at the needle valve, but it started to behave itself once the needle valve was relocated to the firewall.

If I had the spare cash around, I wouldn't hesitate to put one of his BSE rear exhaust 50's on my diamond dust!

Kelly Williams - 59082L
MAAC Jet Committee Chairman
JPO Member , 2L club member
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