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Wanted A change of pace: RWD-1

Post  dirk gently on Sun Nov 24, 2019 12:38 pm

Hello,

here is an obscure Polish plane from the late 20's. It is a change of pace for me, as it will be my first semi-scale model of a sports plane, rather than a military plane. The full-scale was only built in one example and despite having an excellent usable mass to empty mass ratio (over 1) and glide ratio (12), it wasn't terribly successful, as it was plagued with issues with its unreliable engine. It does, however, hold the distinction of being the first of the line of machines built by the famous (in Poland) RWD company. The company later built planes that won a number of international sport aviation competitions throughout the 1930's and what I believe to be to this day the lightest aircraft ever to cross the Atlantic.
https://en.wikipedia.org/wiki/RWD_1

A change of pace: RWD-1 1200px-RWD_1_3view.svg

My model will be 80cm in wingspan, believe it or not, my largest model ever Smile
Power will come either from my Cox QRC or my brand new Sure Start (btw, if someone knows where can I get a 5-10cc tank for the Sure Start I would really appreciate it).

A change of pace: RWD-1 Img_2014
A change of pace: RWD-1 Img_2013
A change of pace: RWD-1 Img_2016


Last edited by dirk gently on Sun Nov 24, 2019 2:55 pm; edited 2 times in total
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Wanted Re: A change of pace: RWD-1

Post  Levent Suberk on Sun Nov 24, 2019 12:57 pm

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Wanted Re: A change of pace: RWD-1

Post  NEW222 on Sun Nov 24, 2019 1:42 pm

Do a search for balloon tank. Easy, reliable and put whatever amount of fuel you like. Consistant runs too.
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Wanted Re: A change of pace: RWD-1

Post  dirk gently on Sun Nov 24, 2019 2:57 pm

Sorry, I just noticed my post is only showing two of the three photos I uploaded, one of them twice. I tried reuploading 3 times now, the only thing that changes is which photo is repeated. Not sure what's that about. It looks fine in the source. Here are the photos again:
A change of pace: RWD-1 Img_2017
A change of pace: RWD-1 Img_2018
A change of pace: RWD-1 Img_2019
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Wanted Re: A change of pace: RWD-1

Post  Ricksrod on Sun Nov 24, 2019 3:48 pm

Very nice! I love those 20's and 30 's designs. Should be a fun flyer. 👍
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Wanted Re: A change of pace: RWD-1

Post  getback on Sun Nov 24, 2019 4:24 pm

Looks lite and floatable , should make a god flier // whats ur power?
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Wanted Re: A change of pace: RWD-1

Post  dirk gently on Mon Nov 25, 2019 3:14 am

Power will come either from my Cox QRC or my brand new Sure Start, if I can figure out a tank for it. The Sure start has the advantage that the needle is proud of the fuselage, so I wouldn't have to make a cutout to reach it.
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Wanted Re: A change of pace: RWD-1

Post  dirk gently on Mon Dec 02, 2019 3:48 am

Here's how it's coming along:
A change of pace: RWD-1 Img_2020


I'm going to shoot for less than 200g AUW.
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Wanted Re: A change of pace: RWD-1

Post  getback on Mon Dec 02, 2019 6:55 am

Looking Good Dirk ! Very Happy
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Wanted Re: A change of pace: RWD-1

Post  1/2A Nut on Mon Dec 02, 2019 10:48 am

What about 30cc / 1oz tank with throttle for this build?
15cc will get you 4 minutes tops.
10cc will be very short 2.5 mins.

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Wanted Re: A change of pace: RWD-1

Post  dirk gently on Mon Dec 02, 2019 1:25 pm

I don't really mind short flights. I just refuel and go back in the air
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Wanted Re: A change of pace: RWD-1

Post  smooth_bill on Mon Dec 02, 2019 6:48 pm

Dirk,

Love the old designs, and this is a beautiful example!

You have retained the spirit of the original, and the structure looks strong enough where it matters.

The Sure Start engine is highly underrated, but has many nice features to it's advantage.

Be sure to check the upper ball joint for play, as these seem to be less carefully fitted in the last days of Cox manufacturing. I've run mine a few short runs to let the ball socket take shape, before reseating with the proper Cox tool. Chances are the re-seating will not have to be repeated.

Performance is second only to the high performance race engines such as the TD, and Venom. The stock intake stack provides the ability to hand choke the engine to ensure initial fuel flow. They were sold by Estes (who purchased Cox) for well under $10 many years ago. I took advantage of that low price as much as I could afford at the time.

Looking forward to your progress, and hopefully more nice pictures and building tips.

Best regards,

Bill Adair
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