FBoss
Key Veteran
Location: Aurora Indiana USA
| Heres the deal. Got my radio back yesterday and got 3 flights in. 2 week downtime on the radio repair. Last flight (2 wks ago) all was fine, Power, smoke, temp, flow.
Had a motor cut out yesterday on flight 2 of 3. Autoed in ugly but walk awayable (woohoo ). Pulled the glow plug, and checked it, glowed fine but replaced it with new anyway. Flew again and all went well.
All three flights yesterday had this in common. 1. could not get it to run hot (lean)landed a few times always checked the BP and clicked in on the main. 2. Pressure line popped off the tank end. Even after 30-50 sec w/o pressure line back plate was COOL. Lots of good smoke and not too much after flight slim. 3.Main tank looks like boiling water, the fuel is going nuts. Header tank looked fine.
My 11am flight this morning was going great. still could not get the back plate hot but sounded like I had very high head speed, great smoke and power, tank fuel still bubbling. landed twice to check BP temp, still cool but some temp. Last time I went in 2 clicks and up around again. Great power, good smoke, higher head speed. At one point (1-1.5 min later) It started loosing headspeed (RPMs) and power. I brought it in to a 3' hover. Longer I was up the less power I had. In the end it cut off and I autoed from that height. This time the motor was smokin' hot back plate at about 3-4 sec.. I could not see fuel in the line to the carb.
OK first. Last rebuild I got a trubalancer and used it for EVERYTHING. Other than the fuel there is no noticable vibration. I will note this. I installed a new machined clutch bell (balanced), it has NO runout in the horizontal plane BUT does runout .020" in the vertical plane. I noticed this on the orig. install and pulled it back out to check it. Bearings are seated, races are clean and the clutch does not catch, spins free. I re-installed it and of course suspect its the vibration problem now but man this heli does run very smooth.
I just removed the tank fittings and check it all out and found no problem. All the fuel line is less than a gal. old.
So other than being short fatter and poor
whats my problem(s)?
Hawk sport, os37, stock century muffler, OS8 plug, 30% cool power, sport flying.
PS EDIT ADD
I have over 75 flights on this frame. Never had a screw or nut back out but in the last 4 flights have had several back out. All points to bad vibration but that vibration doesnot present in the airframe or in flight.
The good ole times are now ,000132 |
