ORIGINAL: knobby1
ORIGINAL: DrGsi
Dear JetJoe Experts,
I bought a JetJoe 1800 this past summer and had a mishap before getting it airborne , sent back to Mark and did a great Job fixing it ; I finally Got it and mount it on a Rookie with a flightworks pump . The Gas Solenoid sometimes gets stuck but opens with a tiny tap with the screw driver and engine starts flawlessly. The RPM reached at Max throttle (on ground) is 115100 ; When I got it airborne in the test flight , I noticed a very weak thrust and had to keep the throttle at MAX to keep the plane flying till just before landing . The Engine is rated at 20Lb but I know this may change depending on a lots of factors but should not be severly underpowered; It was behaving barely like my JETCAT P60 at best . I will check my Fuel lines ...etc... but the MAx RPM is reached yet with weak power. Any suggestions ? Thanks. I am using Jet 1-A with Mobil Turbine oil 5% mixture ; Battery is 2 Cell Lipolymer at 4000 mAh with good voltage not below 7.5v at max RPM. Thanks again.
Hey DrGsi,
Are you able to give us some info?, EGT's at idle and full noise, pump PW reading, relative altitude, ambient temps etc... might be helpfull in helping diagnose the problem.
Cheers,
Smithy.
THANKS,
Idle RPM 32000 ; EGT at Idle 450 Deg ; MAx RPM EGT 590 ; Smooth running at max RPM ( No overheating problem) ; Ambient Temp in Saudi at time of test was 80 Deg F; Altitude of airfield 700 meters above sea level dry weather (10% humidity) . Things that I will change first is to put the airtrap closer to pump ; The airtrap was placed next to nose gear with fuel line coming forward from tank then backwards to pump (placed at CG) then back to Engine. The distance appears to be quite long for the fuel travel ; But if that is the reason, I should not achieve full RPM , right ? Yet I will cut down on fuel line length and check it next weekend. I can't think of something else ..All filters are brand new and clean . Could the fuel solenoid be acting Up ? It shouldn't be with a smooth start and great response to throttle stick ! We will see...... I'll get back to you next week.