Spuetz

Hello everyone,
I bought a Seidel St770. Was relatively good price ($1650) so I could not let it go. Now I need the right airplane to go with it. What do you suggest? I am thinking of a Stearman or Waco or Bucker Jungmeister or Focke Wulf Stieglitz... Some of the sort. Ideally I would not have a cowling around the engine, like with the PT 17 or stieglitz. Who has flown a Seidel in such an airplane and can recommend? What kits are out there? Who knows of a suitable airplane for sale. Since I am currently working on Proctor's Albatros I do not need another building project. So RTF ex engine would be great. Tall order? Well, worth trying...
All suggestions welcome...

Cheers Martin

Big_Bird

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Martin, I have the ideal subject for your Seidel, a Balsa USA Sterman.

This one belongs to James Anderson and was built by Billy Hudson and James. It has had many perfect flights flown primarily by David Hudson.

Ken

Big_Bird

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Martin, this particular version of the Sterman did use a 5 cyl radial.

Big_Bird

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Another

Spuetz

Hello Ken,
thank you for your suggestion. That airplane really looks wonderful! and the kit desciption on balsa usa website sounds very promising. Although they say they're out of stock. And that would be another project after the Albatros is finished (end of next year some time - I hope). But the airplane looks as if it was too big for the Seidel (?) Don't know about the st770's power yet but I think it turns a 22x10 Prop. Not so big, is it. Quarterscale sounds more like it... What do you think? What's the engine on James' Stearman? a big moki?
Thanks again, Martin

Big_Bird

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Martin,

I may have assumed the wrong thing. I thought that the st770 was probably the Seidel 7.75 cuin engine. That is the one on James' Sterman.

The plane weighs about 50 lbs and the engine sounds great. However if you are looking for true aerobatic performance you probably need about twice the horse power. This Sterman flies very close to scale speed and power. It's a show stopper where ever James takes it.

The next time I talk to him I'll find out what prop he is running. I do remember that it turns just a little over 5000 rpm.

Ken

James Anderson

This is James Anderson The stearman weighs 52 lbs. is powered by a siedel 5cly radial swinging a 28x10 prop. It is a large building project and too large for your 770 siedel. 116" wing , 94.5" long and 36" high with 58 flights. I am putting a Zinger 30x8 laminated prop with a scale looking prop hub on it for this season along with more detail graphics. I am looking for the large 7Cly. radial by Siedel. If you can put me in touch with them i would appreciate it . thanks James

Spuetz

Hello Jim,
I just talked to the people at Seidel. Were kind of short on the phone...

Here's their address:

Seidel Motorenbau
Königsberger Str. 10
76316 Malsch
Germany
+49 (7246) 2210

The Seidel ST 726 has about 9-10 HP, turns a 32/16 prop and costs new 2,200 Euro (about 2,350 US$). I found the St 770 on ebay through a continuous search (in "my ebay") If you want to look for one on the net or on international ebay, make sure you spell the name right: it is Seidel, not Siedel... Oh the German language...
I had better do my research before I bid! Payed too much, I think, but hey, that's how we learn... The 710 (new version of the 770) costs Euro 1,650 new. I paid 1,535 but including electronic glower and Prop... So I paid for the old one almost as much as the new version would cost new...
Cheers, Martin

James Anderson

Thanks for the information on seidel, I will order one for my stearman. Check RCU giant Scale August 20, 2000 Page 50 for pictures of my lastest project B-36

bluehrnt

Any suggestions where I might find a scale prop hub for a seidel 710. Or one that has the bolts going all the way around. I dont want the prop to spin off durnung flight.

abufletcher

I know this is a really old thread but it came up on a Google search. Model Craft has just come out with a 50cc size version of their Paulistinha P-56 ARF with a 3 meter wingspan and a 8.5kg flying weight. I'm wondering if this might be a suitable platform to get some flying time on my Seidel/UMS 770.

http://ishii-mokei.heteml.jp/html/pr...oduct_id=23754

(BTW, I've got the small 50-size 4st version of this model and it's wonderfully stable.)

RBACONS

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Abufletcher,

The plane sounds a bit on the light side for the 770. I have the Seidel 770 on a Waco Cabin biplane. At 32 lbs, the 770 flies it in a scale like manner. Enough power for loops, stall turns, wing overs, etc but not a lot more. With the Paulinista at only 19 lbs or so, you certainly won't be lacking for power.

abufletcher

I bit of internet searching suggests the 770 provides about 4hp while the 50cc engines are around 5hp. That's why I was thinking that the 770 might not be enough for the P-56. I'm a bit surprised that for its 3m wingspan that it only has a flying weight of around 9kg. But then the smaller one is also quite lightly (but well) built.

Of course, we need to bear in mind that the 770 itself weighs in at a hefty 2.6kg and with a KELEO exhaust ring and onboard glow system (Microsen) it's probably upwards of 3.5kg. That alone would bring the P-56's flying weight to around 12kg.

I should add that the reason I bought the 770 to begin with was to use it on WWI models at partial throttle. For example, I've got a 1/4 scale MR Sopwith Strutter kit that it would be perfect for. And it's even the engine shown on the 1/4 scale Proctor EIII plans.

abufletcher

I took the plunge and ordered the large P-56. So we shall see. It might look a bit weird with a radial up front but hey, any model with a radial is cool, right?