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  1. #1

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    Slo cub Kand B 20 Davis head

    heres the next one the slow Cub with the K and B 20 Davis head , an ASP/mag 30 4strk came out, It also has a new Hayes 6 oz tankI do not remember the numbers
    on the K and B on the bench but easy start and no issues and QUIET

    Mystery I picked up the plane used in a local hobby shop has a decal on the side

    THERMEX BESCHICHTUNG ( German do not have a clue what it refers too)
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  2. #2
    Mr Cox's Avatar
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    RE: Slo cub Kand B 20 Davis head

    Not an expert on German but it might stand for a heatresistant coating, I think some engines have it...

  3. #3

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    RE: Slo cub Kand B 20 Davis head

    Mr Cox interesting I bought the plane ( no engine) wonder what he could have in it the former owner, the ship is a TT ARF so not likely it refers to the covering

  4. #4
    Mr Cox's Avatar
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    RE: Slo cub Kand B 20 Davis head

    I think the black crankcase of the HP gold head had it for instance. Might have been stickers in the box that came with the engine?

  5. #5

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    RE: Slo cub Kand B 20 Davis head


    Hi,

    According to Babelfish the direct translation is: THERMEX COATING

    I think that Mr. Cox is correct also.

    Jamesf

  6. #6

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    RE: Slo cub Kand B 20 Davis head

    OK Guys THX for the research , looks like first owner may have had an HP in it


    NOW just benched the 20 Kand B davis head 90-91F out there

    12x4 wood XOAR 8500 the XOARS are designed as electric props

    10x6 wood zinger 9000

    10x4 wood XOAR 12000

    10x5 wood MAS 10500

    idle on 10x5 2300 instant pickup to WOT in all cases
    Hand flips 2 to5 after finger choke
    needle 2 1/4 out
    compression half turn off bottom

    Fuel Davis 1/2A not much smoke, quiet, dark honey color on oil out the exhaust a p**y cat to handle

    Plastic APCs would likely give higher Revs

    in all cases idle less than 2500




  7. #7

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    RE: Slo cub Kand B 20 Davis head


    ORIGINAL: Mr Cox

    I think the black crankcase of the HP gold head had it for instance. Might have been stickers in the box that came with the engine?
    Absoluely correct -
    "The Gold Cup series have a special black thermex coating to dissipate heat and are available in both ABC and ringed versions. "

    http://www.mecoa.com/hp/index.htm


  8. #8

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    RE: Slo cub Kand B 20 Davis head

    well that solved an other mystery had to be fitted with the HP 20 based on the mount and spacing to narrow for a 40 martin

  9. #9

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    RE: Slo cub Kand B 20 Davis head

    Martin,

    The K&B sportster 20/28 were two of the best conversions thet you could own. I ran a 28 for 10 years and absolutely loved the reliability of the set up. It tragically met it's end in a flame out on a reverse wingover at the top of the circle with nowhere to run to. Split the case and dinged the cylinder. Tragic. I rebuilt it but haven't used it since. a 4 oz tank with a 10/6 on the 20 or I have even on occassion used an 11/7 on the 28 for shock value will run forever. Sorry I don't remember the rpm numbers for the props that I ran but it is over 20 years and my memory is not that sharp.


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