NGH 9cc gas engine thread - Page 14 - RC Groups
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Mar 19, 2012, 12:12 AM
Demonstrations on Saturdays!
gravityking's Avatar
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!
Last edited by gravityking; Mar 28, 2012 at 11:49 PM. Reason: prop size correction
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Mar 19, 2012, 01:23 AM
Registered User
fiery's Avatar
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.
Mar 19, 2012, 11:25 AM
Demonstrations on Saturdays!
gravityking's Avatar
Quote:
Originally Posted by fiery
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.
Mar 19, 2012, 03:08 PM
Registered User
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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Mar 19, 2012, 08:03 PM
Suspended Account
Quote:
Originally Posted by the pope
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.
Mar 20, 2012, 06:49 AM
Registered User
This is sounding familiar........
Mar 20, 2012, 07:52 AM
Registered User
if that prefer CNC, Sir
Mar 20, 2012, 07:55 AM
Registered User
Problems with NGH engine 9cc (0 min 19 sec)


Problem???? what is???
Mar 20, 2012, 08:12 AM
Registered User
flypaper 2's Avatar
Might pull the head and see if it blew a head gasket if it has one, or popped a hole in the piston.

Gord.
Mar 20, 2012, 10:31 AM
Registered User
Quote:
Originally Posted by flypaper 2
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
Mar 20, 2012, 10:59 AM
Registered User
flypaper 2's Avatar
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.
Mar 20, 2012, 11:04 AM
Registered User
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
Mar 21, 2012, 06:58 AM
Registered User
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.
Mar 21, 2012, 09:08 AM
Registered User
Quote:
Originally Posted by Lifer
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
Mar 21, 2012, 09:17 AM
Registered User
Mikecam's Avatar
My vote is you broke your ring. Pull the head off and make another video.


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