L Edge
Master member
When you design EDF's, there are usually many problems that occur that you must solve, especially if that model doesn't exist(NYGAD). Net result, you end up with a model that you are testing.
Assuming you calculated the CG and verified it and you built it to fly, time for the maiden, you go roaring down the runway and lift off (or a good hand chuck) and hope for the best. Now, a problem you weren't aware of rears it's ugly head. Result, you are in the air and using all your skills, anything can happen from total destruction to gear ripped off to wrinkled skin, etc.
Here's an sample. Designed a Dark Star since there are no plans with 2 5 bladed 64mmEDF's. Held it vertically and hovered at 1/2 throttle, so knew I had good thrust.
Steps used:
Did some high speed taxi tests to insure I had good ground control including differential thrust for turning.
Goal of next step-get speed up and be prepared to do nose down if needed and see what happens or aileron to prevent roll. Object is to have plane stay under 1 foot high off ground.
Set playback speed at .25 and toggle start for action at 14 sec. Observe what happened
When did you see EDF jet nose up and get into air about 10 ft?
It goes back to ground and then hops back into air nose up and then drops back as it slows down.
First thought is the CG is too far aft(should be close, not way off).
I did put in nose down and held it each time it was in air.
Indicated bad pitch up. Made small adjustments, reran, not as bad. Tuned more until solved.
Rather than bore you, I tuned the ailerons and differential thrust so I knew it worked in slight right and left turns.
Video now shows its ready. Sorry, tree shadows blocked straight and level flight about 1 foot off deck and flared nicely to get back on deck. Run at slow speed to see how EDF gets up to speed, I blip elevator and it just tools itself along until I throttle back.
No damage to model, if I tried letting it go not doing this method, it would be a pile of trash.
Now had to add the small field and the guard rail to do maiden. Bought it for landing at high speed and pushed the landing and stopped 12 ft from the shack.
Have over 20 flights now(moved the CG back 3/8 of inch.)
Here's one without landing gear keeping it low to solve the problems of a 64mmEDF of my A-10 Warthog. Again, no damage, yet some wrinkles as I progressed.
After solving problems, same plane(love that low pass, tight turn and downward landing.) My favorite plane.
So, when you are ready to maiden a EDF plane or prop you are unsure, hers an option.
Assuming you calculated the CG and verified it and you built it to fly, time for the maiden, you go roaring down the runway and lift off (or a good hand chuck) and hope for the best. Now, a problem you weren't aware of rears it's ugly head. Result, you are in the air and using all your skills, anything can happen from total destruction to gear ripped off to wrinkled skin, etc.
Here's an sample. Designed a Dark Star since there are no plans with 2 5 bladed 64mmEDF's. Held it vertically and hovered at 1/2 throttle, so knew I had good thrust.
Steps used:
Did some high speed taxi tests to insure I had good ground control including differential thrust for turning.
Goal of next step-get speed up and be prepared to do nose down if needed and see what happens or aileron to prevent roll. Object is to have plane stay under 1 foot high off ground.
Set playback speed at .25 and toggle start for action at 14 sec. Observe what happened
When did you see EDF jet nose up and get into air about 10 ft?
It goes back to ground and then hops back into air nose up and then drops back as it slows down.
First thought is the CG is too far aft(should be close, not way off).
I did put in nose down and held it each time it was in air.
Indicated bad pitch up. Made small adjustments, reran, not as bad. Tuned more until solved.
Rather than bore you, I tuned the ailerons and differential thrust so I knew it worked in slight right and left turns.
Video now shows its ready. Sorry, tree shadows blocked straight and level flight about 1 foot off deck and flared nicely to get back on deck. Run at slow speed to see how EDF gets up to speed, I blip elevator and it just tools itself along until I throttle back.
No damage to model, if I tried letting it go not doing this method, it would be a pile of trash.
Now had to add the small field and the guard rail to do maiden. Bought it for landing at high speed and pushed the landing and stopped 12 ft from the shack.
Have over 20 flights now(moved the CG back 3/8 of inch.)
Here's one without landing gear keeping it low to solve the problems of a 64mmEDF of my A-10 Warthog. Again, no damage, yet some wrinkles as I progressed.
After solving problems, same plane(love that low pass, tight turn and downward landing.) My favorite plane.
So, when you are ready to maiden a EDF plane or prop you are unsure, hers an option.
