Fokker D7 (oz14805)

 

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These Sterling M series kits were to be flown with a half-A engine and either C/L or a round-the-pole variant called "Auto-Magic-Pilot Flying". On the plans there is a description with illustration. It was basically a two line mini-control horn pivoted by a nail on a pole in the middle of the flying circle mounted into the soil, which would help keep the aircraft in level flight whilst flying in a circle control line style without the pilot. Plans show a .020 Cox Pee Wee mounted, but a Cox .049 Babe Bee could be mounted one bulkhead aft.
ghostler - 15/09/2023
Got it. Have set tags for IC etc now, not rubber. Many thanks.
SteveWMD - 15/09/2023
I have to say, that's a lot of dihedral shown there in the pic, also on the plan it's quoted as 2-3/8 inch under each wing tip. For a CL model? Seems strange to me. But then what do I know? Me, I tagged this as a FF rubber model ;)
SteveWMD - 15/09/2023
That's not dihedral, it's an ornithopter, the image is just one phase of the wing flapping movement. This is a remarkable plan, not too many CL biplane ornithopters out there!
Miguel - 15/09/2023
This is what happens when you let marketing overrule common sense, kinda like when Berkeley pitched their 72" Astro Hog kit as suitable for free flight, control line or RC. I think this D-7 was designed for free flight, powered by a Pee Wee. It's entirely too heavy for rubber power and too much dihedral for control line. Yes I could make it fly, but the Pee Wee is a little much for free flight, probably wouldn't survive the first landing. The bottom line: I don't think a single one of them ever flew, probably never even finished.
Doug Smith - 15/09/2023
From the same "Auto-Magic" Pilot (M+number serie) kit see Fairchild PT-19 (oz2024). This is a specific engined serie probably launched with the introduction of Cox .020. Probably this model to fly levelled (with no weight on outer wing tip)needs so much dihedral angle. Could be interesting to see others M series. Pit
pit - 15/09/2023
ok I've checked and have most of the M-series kit plans; stay tuned. pit
pit - 15/09/2023
Hi Steve. It took me quite a while to spot where it is in the plan that dihedral is 2-3/8" under each panel. I was finally able to spot it, in the small parts/assembly illustration of the wing on the upper right corner of the 2nd page of the plan. The funny thing is that in the "wing construction" notes it states that dihedral for the upper wing should be 1-1/2" under each wing (lower wing is stated as 1" both on the construction notes and on the illustration). Although this still seems like a lot of dihedral for a c/l airplane of 21" span, it would certainly be more reasonable than 2-3/8" under each panel.
RC Yeager - 15/09/2023
That's a fair point. It does indeed say 2-3/8, but maybe I'm just reading the wrong meaning from that, maybe it actually means 1-3/16 under each wing (so half of what I said). Could well be so.
SteveWMD - 15/09/2023
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