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Thread: Race chassis

  1. #1441
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    Quote Originally Posted by Grumph View Post
    Well, if you think a "normal" tube frame doesn't look stiff enough, don't look at Tony Foale's early spine frames for TZ's....
    But they worked. With the tyres of the time.
    That Spine though is a fully formed box to bend it one side has to stretch the other has to deform.
    The plate frame only has to bend inside or outside.
    The monocoque has the full box section and a lot of times the skin can also be stressed.

    I think of it like a tube 1mm wall thickness
    Its a heck of a lot harder to bend that than to bend a 4mm thick plate is of the same weight



    Kinky is using a feather. Perverted is using the whole chicken

  2. #1442
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    Food for thought, and a great read!
    https://www.odd-bike.com/2019/07/gue...SGd_DifUKSqqJE

  3. #1443
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    I seen this the other day i had never seen the 500 twin version.
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    Note the wheels they appear to be fabricated like a comstar or a early marvic/akront.
    Pretty sure they only were able to run the 500 twin as a twingle as it rocked too much as a 180 twin.
    Also these

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    Mcmurdos F2 carbonfibre bike based on a ZXR400 chassis with a ZZR600 i think engine.

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    Plus the Bimota split chassis with its coupling which i think was a generic Aircraft fitting design.
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    Kinky is using a feather. Perverted is using the whole chicken

  4. #1444
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    Quote Originally Posted by Frits Overmars View Post
    Food for thought, and a great read!]
    Yes, it is. Thanks for posting it.

    I was probably too close to events here - but I still cringe when someone quotes John Britten as a reason for doing something.
    Most of us now use him as an example for not doing something...

    Husa - There seem to have been two versions of the Ossa/Yankee twin. I've got a pic somewhere of the aircooled engine you posted in a dirt bike.
    I've also got a road test of the pre-production road bike - with a horizontal, water-cooled engine.

    Tony's carbon bike was based on 400 Geometry. He'd had several and liked the handling. First pic I've seen with the downdraft carbs shown. Definitely a ZZR - which at that time weren't sold here.
    I believe the engine came through Lawton and Boyle via Kawasaki NZ and may have been a jap market version - or even pre-production.
    Reason is a tool - remember where you left it..... The late, great, John Clarke

  5. #1445
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    Quote Originally Posted by Grumph View Post
    Yes, it is. Thanks for posting it.

    I was probably too close to events here - but I still cringe when someone quotes John Britten as a reason for doing something.
    Most of us now use him as an example for not doing something...

    Husa - There seem to have been two versions of the Ossa/Yankee twin. I've got a pic somewhere of the aircooled engine you posted in a dirt bike.
    I've also got a road test of the pre-production road bike - with a horizontal, water-cooled engine.

    Tony's carbon bike was based on 400 Geometry. He'd had several and liked the handling. First pic I've seen with the downdraft carbs shown. Definitely a ZZR - which at that time weren't sold here.
    I believe the engine came through Lawton and Boyle via Kawasaki NZ and may have been a jap market version - or even pre-production.
    Are you sure you dont remember the horozontal Cam am twin? rather than the Ossa?

    I always liked that as it was like a giant MB5
    I actually like the look of that OSSA



    Kinky is using a feather. Perverted is using the whole chicken

  6. #1446
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    I think all the 500 Yankees that were production bikes were in tube frames (the dirt models had a frame designed by Dick Mann) and that monocoque racer is probably a later Hererro-tribute bike. The attached Yankee racer photo has a frame that reminds me of an H1R.

    I've got a couple of other photos of the 1000cc 4 cylinder racer built for the 1972 Barcelona endurance race that I'll scan and post tomorrow.

    The 500s were very much doubled up 230/250 dirt engines.
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  7. #1447
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    Quote Originally Posted by Michael Moore View Post
    I think all the 500 Yankees that were production bikes were in tube frames (the dirt models had a frame designed by Dick Mann) and that monocoque racer is probably a later Hererro-tribute bike. The attached Yankee racer photo has a frame that reminds me of an H1R.

    I've got a couple of other photos of the 1000cc 4 cylinder racer built for the 1972 Barcelona endurance race that I'll scan and post tomorrow.

    The 500s were very much doubled up 230/250 dirt engines.
    Looks like the Seely frame thay made of Smarts Kawasaki H2R, but that steering head looks well raked out.



    Kinky is using a feather. Perverted is using the whole chicken

  8. #1448
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    Just very high steering head IMO. An unfortunate line to the tank top and frame.

    Yes, got the Cam-am mixed in. My error.
    Reason is a tool - remember where you left it..... The late, great, John Clarke

  9. #1449
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    Quote Originally Posted by Grumph View Post
    Just very high steering head IMO. An unfortunate line to the tank top and frame.

    Yes, got the Cam-am mixed in. My error.
    that CAM-AM never getting put into production was always a shame.



    Kinky is using a feather. Perverted is using the whole chicken

  10. #1450
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    http://ossa.2y.net/ossa/ossa4.htm

    for some photos/info for the 4 cylinder Yankee which was a private project







    cheers,
    Michael

  11. #1451
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    http://ossa.2y.net/ossa/herreroreplica/index.html
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  12. #1452
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    If you search "Herrero replica", there seem to be a few of varying quality...
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  13. #1453
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    The 1000/4 may have been a works effort.
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  14. #1454
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    There was also a Cobas Siroko Ossa, spaceframe chassis with rotary valve engine but possibly not a factory motor. Check out the (lack of) cylinder finning!
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  15. #1455
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    I've added some more material from Norman Hossack, mainly some detail photos of his Ducati street bike conversion (the sides of the upright bolt to the center main section and he also has the outer portions of the axle attached to those side members) and a few photos of a big-block Guzzi frame during conversion.

    http://www.eurospares.com/hossack.htm

    cheers,
    Michael

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