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Old Mar 18, 2012, 11:12 PM
Demonstrations on Saturdays!
gravityking's Avatar
United States, CA, Woodland
Joined Jan 2012
349 Posts
As I discussed earlier I decided to get a test plane instead of messing with the test stand further.
Got a Seagull Decathlon .40. As a side note, great ARF & the NGH fits perfectly.

Anywho I ran it up & down the street taxi testing without a wing for 10 to 12 minutes burning quarter of a tank on 20 to 1 petroleum oil mix. No issues!! Using 10X7 MAS prop I got 14000 rpm at top end (surprise!) but could not get under 3000 for idle. And as stated above at idle throttle is near or at half open. Don't know when I'll get to maiden, back to work tomorrow. Will keep you informed.

Also can not hand start this gasser even primed & warm. A starter seems mandatory.

Thought some good news would raise some hopes! The problems can be ironed out!
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Last edited by gravityking; Mar 28, 2012 at 10:49 PM. Reason: prop size correction
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Old Mar 19, 2012, 12:23 AM
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Hervey Bay, Queensland, Australia
Joined Mar 2008
516 Posts
Use a 32:1 mix and you will void any warranty.

Manufacturer specifies 20:1 for running in, after that no less oil than 25:1.

Oil must be full synth JASO FD spec.
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Old Mar 19, 2012, 10:25 AM
Demonstrations on Saturdays!
gravityking's Avatar
United States, CA, Woodland
Joined Jan 2012
349 Posts
Quote:
Originally Posted by fiery View Post
Use a 32:1 mix and you will void any warranty.

Manufacturer specifies 20:1 for running in, after that no less oil than 25:1.

Oil must be full synth JASO FD spec.
I would never use synthetic to wear in an engine. Just doesn't happen on synthetic but will be switching after the first gallon is run through.
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Old Mar 19, 2012, 02:08 PM
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Joined Jan 2012
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Today I flew GT9 - First flight of 10 minutes and all normal - suddenly shut down with less than 3 minutes

Something called me a note, and she turned a propeller loose ... had no compression - a propeller spun free - How was no spark
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Old Mar 19, 2012, 07:03 PM
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Originally Posted by the pope View Post
Wheres Mr Chow when you need him ? I hope hes not busy making his next line of engines . Cheers the pope
that's the job of chinese engine manufacturers, FAST CASH and bye bye
what did you expect of the ex JBA owner ? CRAP engines and buy the version 2 if you wanna keep it running.
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Old Mar 20, 2012, 05:49 AM
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Kansas City
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This is sounding familiar........
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Old Mar 20, 2012, 06:52 AM
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if that prefer CNC, Sir
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Old Mar 20, 2012, 06:55 AM
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Problems with NGH engine 9cc (0 min 19 sec)


Problem???? what is???
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Old Mar 20, 2012, 07:12 AM
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flypaper 2's Avatar
Kingston, Canada
Joined Jun 2004
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Might pull the head and see if it blew a head gasket if it has one, or popped a hole in the piston.

Gord.
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Old Mar 20, 2012, 09:31 AM
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Virginia
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Originally Posted by flypaper 2 View Post
Might pull the head and see if it blew a head gasket if it has one, or popped a hole in the piston.

Gord.
Gord, Bet that you broke the con rod. Since you noted something while flying, I'm thinking this is the problem. I had the same problem w/ my JBA. This usually is attributed to insufficient lubrication. However, I had it happen twice and when looking at the rod, the first time it look like a casting defect.

Bob
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Old Mar 20, 2012, 09:59 AM
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flypaper 2's Avatar
Kingston, Canada
Joined Jun 2004
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If he takes the muffler off, which would be simpler, it would show the broken rod. As you say, if the piston don't move, it's the rod.

Gord.
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Old Mar 20, 2012, 10:04 AM
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Virginia
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Fly/Gord: Also switched to Stihl HP. No problem since and the engine has pop-over compression just like a new glow engine. Can't wait to get my hands on this little jewel. Bob
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Old Mar 21, 2012, 05:58 AM
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Kansas City
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My JBA 15cc broke the conrod. It was repaired under warranty and the tech said there was NO indication of a lack of lubrication. This is a quality issue, period.
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Old Mar 21, 2012, 08:08 AM
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Originally Posted by Lifer View Post
My JBA 15cc broke the conrod. It was repaired under warranty and the tech said there was NO indication of a lack of lubrication. This is a quality issue, period.
Interestingly, the piston is going up normal, just very free
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Old Mar 21, 2012, 08:17 AM
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Canada, MB, Winnipeg
Joined Apr 2008
920 Posts
My vote is you broke your ring. Pull the head off and make another video.
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