Ok everyone, here my notes on the Doodle Streak mods for the ARF Flight Streak:
Stock Tail:
Stab:
Chord - 2 1/2"
Span @ TE - 15"
Elevator:
Chord - 1"
Span @ LE - 15"
Span @ TE - 15 3/4"
DoodleStreak Tail:
Stab:
Chord - 2 1/2" Same as stock
Span @ TE - 22"
Elevator:
Chord - 1 1/2"
Span @ LE - 22"
Span @ TE - 23 1/4"
The basic shape of the Stab/elevator is roughly the same crescent shape as the original, just with the span and elevator chord increased.
The fin/rudder are about 80% of the original size, just take the stock fin/rudder and reduce it to 80% with a Xerox machine. Simple but effective. Use essentially no rudder offset other than just a little to be sure that it's not offset to the inside of the circle.
I built the new stab and elevator out of some 3/16 light balsa stock that I had available. The moments are not changed, it goes in the same place that the stock tail does.
I replaced the stamped alum. bellcrank with a SIG 3" nylon, and replaced the leadouts with a Sullivan C-D leadout set.
The pushrod was replaced with a 3/32 musicwire with a carbonfiber tube epoxied over the wire for stiffness.
The pushrod goes in the center hole in the bellcrank (3/4" from the pivot) and the elevator horn is a DuBro large T style with the pushrod connecting 1 1/4" from the elevator.
I use a FP25 with a APC 9-4 prop (Tornado 9-4 prop works well also) and a Hayes 3 oz tank setup non-uniflow, Ala the Dirty Dan/ Brett Buck Tuneup.
Launch RPM is in the 11,000 - 11,200 range in a wet 2 stroke.
.015 lines 60" eyelet to eyelet yield about 5 sec laps.
Yes, it flies well enough to post 490+ scores in winds gusting to 20+ MPH.
I think it weighs in at 29 oz.
Be sure to set the CG fairly far forward, as setting the CG at 3+ inches (as the instructions say) from the LE will be far too tail heavy. A I recall, mine was about 1 1/4 - 1 1/2" from the LE. Of course, set the CG to your preference, but it's better to start farther forward and more it back after a few flights.
The major performance difference is that the high aspect tail starts and stops the turn easier and with less deflection and doesn't require the pilot to apply opposite elevator to stop a turn.
Regards,
Stan