Thread Tools
Old Mar 19, 2012, 12:12 AM
gravityking is offline
Find More Posts by gravityking
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
Sign up now
to remove ads between posts
Old Mar 19, 2012, 01:23 AM
fiery is offline
Find More Posts by fiery
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.
Old Mar 19, 2012, 11:25 AM
gravityking is offline
Find More Posts by gravityking
Demonstrations on Saturdays!
gravityking's Avatar
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.
Old Mar 19, 2012, 03:08 PM
flavinn is offline
Find More Posts by flavinn
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
Edit/Delete Message
Old Mar 19, 2012, 08:03 PM
Mikarro is offline
Find More Posts by Mikarro
Suspended Account
Quote:
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.
Old Mar 20, 2012, 06:49 AM
Lifer is offline
Find More Posts by Lifer
Registered User
This is sounding familiar........
Old Mar 20, 2012, 07:52 AM
michael chow is offline
Find More Posts by michael chow
Registered User
if that prefer CNC, Sir
Old Mar 20, 2012, 07:55 AM
flavinn is offline
Find More Posts by flavinn
Registered User
Problems with NGH engine 9cc (0 min 19 sec)


Problem???? what is???
Old Mar 20, 2012, 08:12 AM
flypaper 2 is online now
Find More Posts by flypaper 2
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.
Old Mar 20, 2012, 10:31 AM
Bpar4 is offline
Find More Posts by Bpar4
Registered User
Quote:
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
Old Mar 20, 2012, 10:59 AM
flypaper 2 is online now
Find More Posts by flypaper 2
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.
Old Mar 20, 2012, 11:04 AM
Bpar4 is offline
Find More Posts by Bpar4
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
Old Mar 21, 2012, 06:58 AM
Lifer is offline
Find More Posts by Lifer
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.
Old Mar 21, 2012, 09:08 AM
flavinn is offline
Find More Posts by flavinn
Registered User
Quote:
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
Old Mar 21, 2012, 09:17 AM
Mikecam is offline
Find More Posts by Mikecam
Registered User
Mikecam's Avatar
My vote is you broke your ring. Pull the head off and make another video.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
For Sale Prop Chart and Thread finder for any Glow or Gas Engine unclegeorge Aircraft - Fuel - Engines and Accessories (FS/W) 2 Dec 10, 2011 12:31 PM
For Sale Prop Chart and Thread finder for any Glow or Gas Engine unclegeorge Aircraft - Fuel - Engines and Accessories (FS/W) 2 Oct 14, 2011 12:44 PM
For Sale Prop Chart and Thread finder for any Glow or Gas Engine unclegeorge Aircraft - General - Miscellaneous (FS/W) 0 Oct 07, 2011 11:46 AM
For Sale Prop Chart and Thread finder for any Glow or Gas Engine unclegeorge Aircraft - General - Miscellaneous (FS/W) 3 Sep 24, 2011 12:25 AM
Sold NGH GT17cc gas engine NIB ibcinyourc.com Aircraft - Fuel - Engines and Accessories (FS/W) 4 Jun 30, 2011 11:35 AM