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Author Topic: Webra 61 Blackhead RC engine conversion to CLPA??  (Read 1440 times)

Offline Jim Oliver

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Webra 61 Blackhead RC engine conversion to CLPA??
« on: January 21, 2007, 09:06:07 AM »
Hi guys,

Help me think this through--I have two NIB Webra blackhead .61s.    Bought them a long time ago for near nothing and have been wondering if they might be converted to CLPA use.

They have baffle piston with one ring, twin ball bearings, muffler lugs and weigh about 13 oz. (My friend's Fox .59 weighs 12.25 oz. without a muffler.)

IIRC, these were considered to be "torquers" in their day.  I wouldn't consider using them if I didn't already have them. 

Any one ever tried this engine for CLPA?

Thanks,

Jim

Jim Oliver
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Offline Bill Little

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Re: Webra 61 Blackhead RC engine conversion to CLPA??
« Reply #1 on: January 21, 2007, 09:45:25 AM »
Hi Jim,

The "Blackhead" 28 and 32 (don't know exactly that they are the same series) have been used in CLPA.  They did have to have porting and head mods.  I still have the 28 that Bob Hunt used in his Tucker Special to start off with.  Very strong, but "run aways" if not "modded".

Bill <><
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Offline RandySmith

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Re: Webra 61 Blackhead RC engine conversion to CLPA??
« Reply #2 on: February 02, 2007, 01:58:11 PM »
Hi guys,

Help me think this through--I have two NIB Webra blackhead .61s.    Bought them a long time ago for near nothing and have been wondering if they might be converted to CLPA use.

They have baffle piston with one ring, twin ball bearings, muffler lugs and weigh about 13 oz. (My friend's Fox .59 weighs 12.25 oz. without a muffler.)

IIRC, these were considered to be "torquers" in their day.  I wouldn't consider using them if I didn't already have them. 

Any one ever tried this engine for CLPA?

Thanks,

Jim



Hi Jim

The Webra 61s  you are referring to are  HIgh timed RC engine, They have lower  pipe timing like other brands of RC aerobatic engines. This and the  weight would put most anyone off from using them as  C\L stunt engines, but If your going to try use a lower pitch prop such as a 13 1\2 x 4  or  4  1\2 pitch. low nitro 5%  and get some head shims for trimming.
I would use a 280 size venturie, and a tank plumbed uniflow

Regards
Randy

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