Goto 0:30 skips the on the bench look over.
"""""I'd sell this if someone is interested""""". I live near Monterey California.
It's in very good condition, the only things I'd like to do for it is to put on an airfoiled vertical stabilizer and maybe enlarge it a-bit to alleviate the adverse yaw a-little bit. I'd also like to replace the aileron servo for a couple of reasons, one being that it's way old school and Slow, the other being that the servo is large and the elevator pushrod rubs on it because it's too tall, It's all good in that it doesn't drag it down or even have any effect on it, but it bugs me! A newer smaller (less tall) servo would eliminate that worry altogether. Other than that, it's in GREAT CONDITION!
Today is July 2nd, 2023.
My 1st "real" flight with it in "real winds" lol, pretty cool!
I'll likely do an SR-7 re-take video but for now this gets it posted/shared.
I helped my friend build it back in the 80's: we've lost touch but I recognized it in a hobby shop and snatched it right up!
Weighs 3 Lbs. 7.7 oz and I'm pretty near to my Rear CG mark
My geometrically calculated CG Range from the center or root TE measured forward is:
CG Range: 8 5/16" - 8 7/8"; careful with that 8 5/16" thing lol
Note: 30% AMC = 8 5/16" forward of the Root Trailing Edge (be careful here!)
25% AMC = 8 7/8" Forward of the Root Trailing Edge (super safe: likely the fastest CG setting)
Be careful with the rear CG calculation because each build is slightly differing than another!
Also the 25% AMC location sucks when the wind isn't quite enough: 8 1/2"= start here: safe!
During the 2:30 "high lift area" floaty-climb, I had to push the nose over at the near-stall-apogees: it "didn't volunteer" to drop its nose; the tendency was for the nose to slightly rise during high lift area floaty-climbs which means it's nearly tail heavy: I'm at 1/64th of an inch forward of 8 5/16" CG
(8 21/64" forward of the root T.E.). In this case I'll add a smidgen of nose weight to stop that tendency which should result in a slight increase of efficiency in turns and pulls (which helps to carry speed). That's how I balance all of my sailplanes (to favor aerobatics over speed).
Verification: if I had too much up trim it would do this too: I know this so: not caused by trim setting
Also recommend that you put a 2" long 3/16" sq. piece of balsa somewhere on the bottom near but just behind the CG: round it off for aerodynamics: Reason is that this thing will slide and slide and "Slide" until it hits something (post, driftwood, clump ect...) especially in sand. The 3/16" inch protrusion will dig into the sand and offer some "Brakes"! There's literally no control once touchdown occurs so with no rudder "your committed" and maybe screwed!
If landing on a long beach at the bottom of the dune and you can full flare every time you land you probably don't need this but if spot landing on the top of the hill or dune behind the lift zone where mother nature doesn't offer "consistency" this allows you come in a little hot and force it down: a nice attribute to have in the bank!
You will find yourself coming in hot from time to time: guaranteed!
Complements a Vintage set; Windfree, Aquila, SR-7, and a 70s' scratch Delta wing. (Videos yes)
I don't get to fly this one much because I fly at the beach and so when the wind is high enough "to have fun with it" the sand gets blown up and into my radios gimbals thus jamming my controls. After rainy days (winter/spring only in California) the sand is heavy enough that I can fly in these winds. yeah I know, I could use a a radio glove but I hate the feel of them: they feel restrictive/bothersome and I don't need to use them often enough to get used to them
Hope you enjoyed!
Robert
20 апр 2019
