DR-1 (Sands): Builders Group - Page 181

Der Grüne Flieger · 7 August 2007, 02:11 PM

My electric drill scarfer

Dogtail2,

Thanks for posting that picture. I have been trying to figure a good and simple way to make all the scarf joints I am going to have to do for my Alb. project. Your solution is so simple in hurts!

Phil

Jim Bruton · 7 August 2007, 08:10 PM

looking great Pete! thanks for posting.

watpho · 7 August 2007, 08:16 PM

What are you using to measure and hold the drill at the proper angle?

Dogtail2 · 8 August 2007, 03:20 AM

Quote:

Originally Posted by watpho

What are you using to measure and hold the drill at the proper angle?

Wedged between the drill holder and the table are a couple of wood wedges previously used for blocking the spars while glueing. These adjust the angle of scarf . Then a large G clamp fixes it in position.

womenfly2 · 17 August 2007, 09:17 AM

2-part Question: Can anyone tell me in a 60-degree dive what the speed of a DR.1 with the rotary at idle and at full power would be? Anyone know?

WF2

Sorry if OT, but you guy's would.

Jim Bruton · 17 August 2007, 12:18 PM

W2F,

That's a good question. Our friends up in Canada would know and of course Feed would (I will email him and ask). In the meantime, I'll hazard a guess of perhaps 80mph- lots of drag and all that- bet you have to keep pressure on the stick! Andrew, do you know?

Sorry I have been quiet here for a while- Ed and I will reconvene at Hangar 1 tomorrow. We're working on the trailing edge wire on the middle and lower wings- then they will truly be ready to cover!

Jim

Maxim08 · 17 August 2007, 04:54 PM

Jim,
I may have missed this earlier, but what tension are you putting on the trailing edge wire? The only reference I have is for the JN4-C @ 110 lbs. Seems like a lot. Do you suspect it is different with Cecconite vs cotton/linen?
Regards,
John

Dogtail2 · 18 August 2007, 02:54 AM

Quote:

Originally Posted by Maxim08

Jim,
I may have missed this earlier, but what tension are you putting on the trailing edge wire? The only reference I have is for the JN4-C @ 110 lbs. Seems like a lot. Do you suspect it is different with Cecconite vs cotton/linen?
Regards,
John

The Sands drawings state that the wire should be pre bent into the scalloped shape. Obviously no tension at all if this is done. However I dont think this is the way it was done. I think the wire is put on with no pre-bending and no tensioning and the scalloped shape (and tension) is made naturally when the fabric is shrunk on the wing. I know of at least one Triplane covered with Diatex) flying here in England which was done this way and it looks and flies great. Ive done the same with mine.

Fokker210 · 21 August 2007, 07:49 PM

Hope everyone's build is progressing - I have been tied up for the past six weeks with some work related training so it has been exceptionally slow here ! The blistering heat in the workshop has not helped matters any !

Hope to be back at it full force shortly as my training concludes next week !

baldeagle · 21 August 2007, 09:47 PM

Quote:

Originally Posted by Jim Bruton

W2F,

That's a good question. Our friends up in Canada would know and of course Fred would (I will email him and ask). In the meantime, I'll hazard a guess of perhaps 80mph- lots of drag and all that- bet you have to keep pressure on the stick! Andrew, do you know?

Don't know about a 60 degree dive, but the Warner powered Triplane that I used to fly at ORA had what seemed to be a fairly accurate ASI in it, and one day I pushed it over into a vertical dive with throttle back, and it hit 150 mph indicated so quick you can't believe it. Might not be as draggy as we usually assume. Of course you also read about SE-5a pilots diving to 200, so it's all relative, especially if someone's shooting at you.