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  1. #151

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    RE: Seidel 7-70 radial: Help me decide!

    I have a Seidel 7-70 with rear collector ring I want to sell. It runs beautifully. I had it on a 1/5 Scale Ziroli Stearman. It flew 6 times - never crashed. They are rare and beautiful. Contact me if you are interested.

    D. Smith

  2. #152
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Is this one of the "new" Seidels or the older, made-in-Germany version? Did you buy the collector from Seidel or is it "after-market" or home-built. I'm planning on running mine without the collector.

  3. #153
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    BTW, here's an eBay auction for one of the older versions of the 7-cylinder Seidel.

    http://cgi.ebay.com/Seidel-ST-726-7-...item33613e2b46

  4. #154
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    ORIGINAL: Frank Sopwith
    But a test stand can be made in a day and we will enjoy the sound of this engine soon!
    What I'm thinking of doing is to build a removable module as seen in the EIII below and then make it so this unit can "dock" with a stand for engine tests. Then, when I eventually get to building a model (or models) I can just slip this unit in place and bolt on.

    So, does anyone happen to have a design for one of these sitting around...or do I need to work it out myself?
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  5. #155
    geezeraviation's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Don a radial without a collector ring creates an oil storm of epic proportion, ask anyone who has run one with the straight pipes.
    Doc
    Happy landings, Doc Hou Tx
    The second rule of modeling is there is no such thing as an insignificant savings in weight

  6. #156
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Just exactly like the original rotaries! One of the main functions of those WWI cowls was just to keep the oil from flying all over everything...which it pretty much did anyway.

    Anyway, we'll see. If I absolutely have to have one, I'll eventually work something out.

  7. #157
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    RE: Seidel 7-70 radial: Help me decide!

    ORIGINAL: abufletcher

    So, does anyone happen to have a design for one of these sitting around...or do I need to work it out myself?
    Don, check your E.III drawings

  8. #158
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    ORIGINAL: Teus
    Don, check your E.III drawings
    Oops! Guess I need to look harder! [sm=red_smile.gif] Hmmm, that sorta helps...
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  9. #159

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    RE: Seidel 7-70 radial: Help me decide!

    I have the Seidel 7-70 which was made in Germany (Imported by Proctor). It has exposed valve lifters. The rear collector ring is an original Seidel.

    Dean Smith

  10. #160
    geezeraviation's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Those WWI cowls were housing rotary engines that were rotating and thier exhaust stroke was at the open portion of the cowl on the bottom. not to say that the whirling dervish didnt drag some of that exhaust up and around the inside of the cowl because I have watched them wipe the oil off of the Fok Dr 1 at Kingsbury Aerodrome after a flight, it's Le Rhone powered and the entire length of the fuse sides, bottom, tail group and landing gear are dripping castor upon landing. A whole gang of guys gets on it immediately as it will stain the dope the airplane is finished with like yellowed varnish.
    Doc
    Happy landings, Doc Hou Tx
    The second rule of modeling is there is no such thing as an insignificant savings in weight

  11. #161
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Sounds perfect!

  12. #162

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    RE: Seidel 7-70 radial: Help me decide!

    Ordered a Seidel 770 a short time ago and it arrived yesterday. Thought you might enjoy the unpacking of one of these radials. Radial Strip Tease

    Jim
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  13. #163
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    ooh, take it off, baby! Take it ALL off! Mine should be here in a week or so.

  14. #164

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    RE: Seidel 7-70 radial: Help me decide!

    What is the outside diameter of 7-70 radial-min. size cowl required??

  15. #165
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    RE: Seidel 7-70 radial: Help me decide!

    According to Seidel's specs it's 230mm. But I'm not sure how they measure that. Luckily most of the cowls for 1/4 scale WWI models would be in the range of 260mm, so no problem.

  16. #166

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    RE: Seidel 7-70 radial: Help me decide!

    You already got it and you are just not telling us...right?

  17. #167
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Yesterday, I got an email from UMS saying they were going to ship it today. The real question is how long it might be held up in Japanese customs. Experience tells me it will either go straight through, or might take up to a month to clear.

  18. #168
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    RE: Seidel 7-70 radial: Help me decide!

    Hello everyone,

    I am back with good news.

    My Proctor Nieuport flies! And how she flies! Beautifully!
    I was a little bit concerned with the weight (20.5 lbs) and the C/G: Very confusing Plan indications. Thanks to everyone who helped.

    On Monday I finally rented a small truck (cause I did not want to dismantle and reassemble). It was a gorgeous day here in Germany, way too warm for the season, deep blue skies and a light wind.
    I was quite nervous when I slowly advanced the throttle. Will she turn on her back, nose straight up in the air? Fall apart on takeoff what with all the flimsy proctor-scale fixings?
    Nooo! I hadn't even reached half throttle when she - very gently - lifted herself of and tracked straight ahead into the blue sky. Little down trim - ah - she seems to be a little tail heavy?
    What a joy to fly. So docile, smooth and slow. I hadn't thought that she'll be that slow what with all that weight.
    Landing was the most beautiful non-event of the year! keep the throttle slightly open on final and only take it all the way back in the flare - and she sets herself down ever so gently. A greaser if it wasn't for the grass....

    What a joy.

    PS: BTW that is not Major John Huffer in the pilot's seat. It is Warren Pietsch. I convinced him to leave his Hangar9 Taylorcraft for a moment to test fly the Nieuport. Needed someone reliable!
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  19. #169
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    Great to hear of a successful "Seidel" flight! Oh, and the model it's hauling around is pretty ok too. So how would you evaluate the engine performance on this model? How much of the power did you use? How did you have the throttle set up? For example, can you go "full power" if you want to or have you limited the servo movement to only use the low range?

  20. #170
    abufletcher's Avatar
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    RE: Seidel 7-70 radial: Help me decide!

    ORIGINAL: Spuetz
    ...she seems to be a little tail heavy?
    Actually tail-heavy or just flying in a tail down attitude but stable?

  21. #171

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    RE: Seidel 7-70 radial: Help me decide!

    Very nice As Abu has mentioned how was the performance of the plane? It should fly very scale like, hopefully.
    BobH.

  22. #172

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    RE: Seidel 7-70 radial: Help me decide!

    Thats a nice Nieuport. It is also nice to see that it will fit "standard" cowls. Any temperature problems?

  23. #173
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    RE: Seidel 7-70 radial: Help me decide!

    Hello Abu,

    no, I did not limit the power - but with full throttle you could probably torque-roll! Waaaaaaaay to much power! (>6000 rpm with a 24x8 prop!) But that's the beauty: This way the engine is running low and slow with that awesome sound.
    I wouldn't limit the throttle servo though. Who knows when I will need that extra power... And the airframe seems pretty sturdy.

    I did program a throttle curve, though: Slow start, appreciating fast in the end.

    As far as the c/g is concerend. After down trimming the elevator, the plane would fly straight and level at any power setting. Only when very slow I need to pull up a bit to keep her flying - as expected.

    Cheers, Martin

  24. #174
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    RE: Seidel 7-70 radial: Help me decide!

    Congratulations on the maiden flight.
    I'm very excited to hear you are getting more than 6000 rpm with a 24x8.
    I am planning a 24x8 3 blade for my Corsair, should run fine.

    Where in Germany do you live, I moved to the Netherlands to Mommenheim, just 10km south of Mainz last year.

    Danny
    Danny \"Remklep\" Busch - CORSAIR Brotherhood #40
    Real planes have bent wings and round engines!

  25. #175

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    RE: Seidel 7-70 radial: Help me decide!

    Abufletcher;thank you for the site in india,they have hydralic landing gear system I've been looking for to put in my 120" A-1 SKYRAIDER,plus that 250 gas radial looks good too,thank you again.
    keep your powder dry and pray the creeks dont rise.


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