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  1. #3201
    earlwb's Avatar
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    RE: Everything Radial Engines

    Those super sized RC biplanes are pretty spectacular. But I don't know, I think I would be too tired to fly them after all the effort needed to get them to the flying field, then assemble them, and then fly them, and have to take them apart to take them back home too.

    In case some of you don't frequent the diesel engine groups.
    At the moment I only have a WOHM 10cc diesel radial engine. I am waiting on a airplane kit I ordered to arrive before I can build a plane for it to fly it.  Of course the neat thing about it, is that it doesn't use glow plugs or spark plugs.







    [youtube]http://www.youtube.com/watch?v=7R6dbb45ax8[/youtube]
    Club Saito #722, Sig Kadet Brotherhood #80, GlowHead Brotherhood #14,
    AMA # 928076

  2. #3202
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    RE: Everything Radial Engines

    Welcome Earl, and hey, that little thing runs great!

    So where do you get those and how much do they set you back?

    (...and what else do they have to offer )
    AMA# 134406

  3. #3203
    earlwb's Avatar
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    RE: Everything Radial Engines

    The WOHM radial diesel engines are made by a fellow in Germany named Wolfgang Hoepfner.
    It takes him about 14 days to make a engine. My engine is engine number 22 of this type.
    He just makes the three cylinder radial at this time. But there have been singles and twins before. He does do them in different anodized colors though. Cost depends on the currency exchange rate at the time with Euros, mine cost $538 US when I bought it.
    I thought the price was extremely reasonable too. Especially for a unique three cylinder diesel radial engine like this.

    He didn't just use a large hex bar of aluminum for the crankcase either. If you look, you'll notice the raised cylinder bases in the crankcase where the cylinders are screwed in at. So he had to hog that crankcase out in the hex shape while making the raised cylinder bases in it too.

    If someone wants a engine, I can provide his email address. I think you could order it in whatever anodized color is available. He has done black, red, purple, blue, gold, and green so far, But if he has one already, then it is the color he made it in at that time. He was putting them up on Ebay Germany from time to time as he built them.
    You can google for the WOHM engines and see a number of Youtube videos of some of the other engines he made.


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  4. #3204

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    RE: Everything Radial Engines

    I also think it is a lot of hassle with bigger planes with taking them apart to get them to the airfield. This is one of the reasons why I have my Dodge as daily driver, I can put a big plane in the back without the need to take it apart for transport. But this is only one of the reasons.

    Thanks Kmot for your comment about my Dodge With twinturbo setup and a lot of pumpwork by myself and 713hp/1170ftlbs dynoed so far it is a pretty fun ride.

    Earl, how much vibration does this WOHM diesel radial create? What kind of rpms it turns and what size prop?

  5. #3205
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    RE: Everything Radial Engines


    ORIGINAL: JariV



    Thanks Kmot for your comment about my Dodge With twinturbo setup and a lot of pumpwork by myself and 713hp/1170ftlbs dynoed so far it is a pretty fun ride.

    Are you and Polly friends?
    ~Tom~

  6. #3206
    earlwb's Avatar
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    RE: Everything Radial Engines


    ORIGINAL: JariV
    Earl, how much vibration does this WOHM diesel radial create? What kind of rpms it turns and what size prop?
    It is amazingly smooth. In the videos I made, the little fuel tank jar does not even jiggle any when the engine is running, even at WOT. The three cylinders actually balance each other out quite well. There is a mild high frequency vibration, enough where the tachometer will not stay on the table at WOT, but it isn't severe but mild. If you watch the videos, you'll see the fuel in the fuel jar/tank just sitting there and not spashing around, almost like the engine is not running at all.

    Top RPMs is about 6,600 with a 11x7 prop. But the engine runs better with props like a 12x8 or 12x10 or 13,6, or 13x8 size. I was using a 12x8 prop on the engine. Since the prop shaft has a 12mm diameter, you need to use solid shaft props otherwise you can't ream them out accurately.


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  7. #3207

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    RE: Everything Radial Engines

    This was a very pleasant day for me and my radial-Pitts. First flight today and everything went very smooth. I loved flying that little thing.

    This was also a very dark day for a guy I see in the same airfield. His BIG Moki radial engined Corsair got a fatal radio breakage and there was absolutely NOTHING to salvage from that wreck. Even the engine block torn to bits. Over 3 meters wingspan, and everything custom made, including folding wings and all the right stuff. Over 12.000 euros invested and over 4,5 years build time.

  8. #3208
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    RE: Everything Radial Engines

    What a bummer for the poor guy!

    Any photos?
    ~Tom~

  9. #3209

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    RE: Everything Radial Engines

    This is a video from couple of days ago when everything was all right:

    F4U Corsair 1/4 scale:

    http://jarkko.pictures.fi/kuvat/f4u_...r/P1020803.MOV

    I did not want to take pictures of the wreck. It is the owner's business. I did not want to offend him. But I can tell you that there was not that much to take pictures of...

  10. #3210

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    RE: Everything Radial Engines

    Builder and owner of the now-ex F4U Corsair 1:4 scale:

    http://jarkko.pictures.fi/kuvat/f4u_...7082011028.jpg

  11. #3211

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    RE: Everything Radial Engines

    I feel so bad for him. I have a black horse corsair with a seidel 7-70 in it. If something happened to it I would be devastated and I did not do near the work he did.[img][/img]

  12. #3212
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    RE: Everything Radial Engines


    ORIGINAL: JariV

    Builder and owner of the now-ex F4U Corsair 1:4 scale:

    http://jarkko.pictures.fi/kuvat/f4u_...7082011028.jpg
    Oh my God! That is the worst crash damage I have ever seen. It's like a bomb exploded the plane to bits! [X(]
    ~Tom~

  13. #3213
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    RE: Everything Radial Engines

    It was a beautiful model, as seen in the video. Please give your friend our best wishes.
    ~Tom~

  14. #3214
    earlwb's Avatar
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    RE: Everything Radial Engines

    Wow, that is a major bummer for sure. My condolences go out to the owner of it. It is a shame it died.
    That was a really nice looking plane too. it looked great in the air.
    Club Saito #722, Sig Kadet Brotherhood #80, GlowHead Brotherhood #14,
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  15. #3215

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    RE: Everything Radial Engines

    Datalogger showed 98mph of GPS speed just before impact. Head on into hard ground. He has been able to talk about his crash in Finnish website. I will forward your condolences to him.

  16. #3216
    Kostas1's Avatar
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    RE: Everything Radial Engines

    Any video of the engine running;
    **Check my gallery for more pictures**
    http://www.rcuniverse.com/community/...y&memid=222042
    Club Saito member #706

  17. #3217

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    RE: Everything Radial Engines

    Hello All
    Today, I've flown my Stearman pt17 20
    flight passes total
    Well have great confidence in UMS Seidel 7-35 going very well.
    Mototrn have 5 hours so it is been run in.
    There has been a pleasure to fly with this engine, so hope it gets a lot more.

  18. #3218

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    RE: Everything Radial Engines

    Great new Linkan. I am still having much success with my UMS seidels also. My 9-90 is approaching 100 flights and shows NO wear. I am around 50 flights with the 7-70. One of my 7-35's is at Kelvins being fitted for a collector ring. I have settled on 8% oil for the fuel. Does your Stearman have good solid takeoff power? Oops I just found your video yes you have plenty of power. Hey throttle back some and make that plane look realistic! -Tom

  19. #3219

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    RE: Everything Radial Engines

    There is enough power at start no problem, have 18x8 prop.
    I have 6% oil and no nitro.
    Long live the radial engine

    Lars

  20. #3220

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    RE: Everything Radial Engines

    Tom
    have any idea when collector ring to 7-35.
    Come on the market
    Lars

  21. #3221

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    RE: Everything Radial Engines

    Lars, He has had my engine for 3 and a half months. The nuts have been made and the jig is nearly complete so hopefully soon. It will be stainless steel due to the tiny pipes on the engine. -Tom

  22. #3222

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    RE: Everything Radial Engines


    ORIGINAL: Linkan2

    Tom
    have any idea when collector ring to 7-35.
    Come on the market
    Lars
    Collector rings will be available for all the EvolutionRadial engines about mid November. Check our website for pricing information. The part number for the 7-35 will be EVO735114. It is not on the website yet but it will be shortly. This will include the new exhaust tubes to align with the collector ring.

    pete

    Pete
    Pete Bergstrom
    Saito, Evolution & Zenoah Manager

  23. #3223

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    RE: Everything Radial Engines

    Lars, The evolution rings do look very good that Pete just mentioned -Tom

  24. #3224

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    RE: Everything Radial Engines

    Can you add pictures and price.
    When they become possible (7-35)

  25. #3225

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    RE: Everything Radial Engines

    Linkan, is your pt-17 a great planes variety? Post some pics if you can.


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