Slo cub Kand B 20 Davis head
10-07-2012, 09:48 AM
#1
Thread Starter
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)
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)
10-07-2012, 10:23 AM
#3
Thread Starter
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
10-07-2012, 12:05 PM
#6
Thread Starter
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
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
10-07-2012, 02:20 PM
#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?
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?
"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
10-07-2012, 02:43 PM
#8
Thread Starter
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
10-07-2012, 04:09 PM
#9
My Feedback: (90)
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.
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.
