burbur

Hello Friends,
I am new into pylon and installed a Sport Jett 0.50 with tune pipe into a great planes viper. I have a 8*9 APC prop turning 18.750 rpms. But with a 9*9 prop the rpm falls down to 16.000 rpms. This is the first Jett engine in Turkey and I donot have anybody else at the field with Jett engines experience. Should the engine not be turning more? I am thinking that this engine should be turning a 9*9 apc over 17.000rpm. Am I wrong? Can I please get your experiences with SJ 0.50 with tuned pipe on props and rpms.
All the best

jaka

Hi!
What glow plug and fuel do you use?

lfinney

My Feedback: (44)

is it broken in yet/
or is it new out of the box

burbur

I am using 15% nitro and 18%synthetic & 2% castor oil fuel. Is it broken in? I have run the engine for 20 minutes on the test bench rich and flow 6 times, each 3 minutes. So, the engine has run for between 35-40 minutes. The glow plug is the original one but the glow plug bursted on the last flight although the engine is definitely not lean.

burbur

Any more comments friends?

fizzwater2

My Feedback: (61)

You might want to post this question over on the Jett support forum in the engines section.. Bob Brassell will check there and answer questions. He's always been pretty helpful to me.

ptwolfe99

email dubb or call .

daven

My Feedback: (1)

Dubb is out of town over the weekend, may want to hit up Bob Brassle in the Jett Support forum.

burbur

Thank you. Bob has been very helpful. All the best