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.