Harmon Rocket III
October 27th, 2006 Submitted by: Adrian
I did a run in of my Harmon Rocket III today. Engine ran well… Engine is a Super Tiger 45. Note to self… gotta make sure the engine is totally reliable before making maiden flight. Need to brace the tail as well…. How do you control a plane without a horizontal Stabiliser? Oh gosh… well anyway here’s a pic of my ROCKET
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| Here’s an account of my maiden flight on my Seagull Models HARMON ROCKET III |
| My Harmon Rocket had its maiden flight on 16 Aug 2006. I would say overall things went well. It took at least 180oz of weight on the nose to get the plane balanced. The engine which was a Super Tiger 45 ABC took a little time to tune as the high speed needle valve had to be taken out each time the cowling comes out. I also managed to blow a glow plug which had to be changed before we could fire the engine up again. Having checked all the control surfaces for correct movements, I taxied out and took advice from my flying buddies to use the entire runway for initial takeoff just incase the engine quit on me.??Â
The rotatation process went without fail, I throttled up and?the rocket tracked straight down?without much need for direction correction. I held?a little up elevator during the initial rollout to ensure an authoritative?tail wheel.?A couple of seconds later, the rocket was in the air with a positive climb out. At height, I trimmed it with just a couple of right aileron clicks and a couple of up elevator clicks. After that the bird was tracking as though it was on rails. I would have to say that this is one of my recently built planes which tracked so well with so little need for trimming. I took the plane for a couple of turns, a couple of low passes and a vertical climb out. Again the plane tracked as though it was on rails. It had the stability of the larger birds. It didn’t look as though it was affected by?wind like how?smaller electrics are. I would have to say the Super Tiger isnt as powerful as how a four stroker would be. The vertical climb out did peak after a while instead of going unlimited vertical. I was using a 11×6?Master Airscrew for the task. THE FAILURE: After having flown for approximately 2-3 minutes now, the throttle decided not to respond to my controls. Apparantly the throttle barrel jammed and I no longer had throttle control. Warnings of an impending flame out, dead stick and possible crash was broadcasted out. I flew it around for another 5 minutes or so before the engine decide to starve on the emptied fuel tank (Not too sure how large it is but its the square one provided by the manufacturer). I was surprised how easy it was to bring the bird down on a dead stick. I made up downleg turns in plenty of time to line the rocket with?the runway. I had an initial bounce as I came in slightly hot just incase I didnt make the runway. On the bounce the elevator control was released and then reapplied just before the bird touched the ground again… and what do you know…. it made a perfectly flared and soft landing. Not too bad for an initial flight with no previous experience on the handling of the plane eh ? ?UNTESTED CHANGES DONE AFTER MAIDEN FLIGHT: I have since taken out 24oz of weight from the nose (while still keeping within the maximum boundaries of the CG) in hope of reducing the need to have the up trim on the elevator. That would also make the plane lighter and with?tail slightly heavier for a more responsive elevator. Hopefully with the reduced stress on the elevator, the stabiliser will also stay in place rather than fail during high speed passes as reported by other owners of this plane in forums. |
Entry Filed under: Radio Control










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