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HelicopterEngines Plugs Mufflers Fuel › OS 50 Hyper Conrod question
11-29-2007 06:29 PM  9 years agoPost 1
nofear

rrApprentice

Chicago - NW Suburbs, IL

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Morning Lads.

Well the question im posing today is which way does the OS 50 Hyper
Conrod go onto the crank.I was unfortunately not paying enough attention when I stripped the motor down for a re-build.

See My pics below.

A. With the recessed side of the brass "collar" facing out.

B. With the flat side of the brass "collar" facing out.

Pic A.

Pic B.

I'm thinking probably B, but want to double check before I put the motor back together.

Thanks.

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11-29-2007 06:49 PM  9 years agoPost 2
BarracudaHockey

rrMaster

Jacksonville FL

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I'm about 90 percent sure its B

Andy
AMA 77227
http://www.jaxrc.com

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11-29-2007 07:00 PM  9 years agoPost 3
AzHyper

rrKey Veteran

Peoria, Az.

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B is correct. The flat side goes towards the back plate. The chamfered side goes towards the crankshaft.

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11-29-2007 07:46 PM  9 years agoPost 4
nofear

rrApprentice

Chicago - NW Suburbs, IL

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Excellent.

Thanks for the input.

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11-29-2007 08:17 PM  9 years agoPost 5
BarracudaHockey

rrMaster

Jacksonville FL

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Yea I thought so but I didn't have one on my desk at work to pull the backplate off and check

Andy
AMA 77227
http://www.jaxrc.com

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11-29-2007 10:17 PM  9 years agoPost 6
airdodger

rrElite Veteran

Johnston USA

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It's door B.

Chris

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11-30-2007 05:55 AM  9 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

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Subtle hint...

Look closely at the bronze bushing in picture A and B. In picture A, you can see that the bushing is chamfered, in picture B, the bushing is not.

The chamfer is there to provide clearance for the small machined radius that's present where the crank pin that the rod rides on transitions to the rest of the crank.

Yes, the answer is B, as that chamfered part of the bushing is where it should be.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-30-2007 11:59 AM  9 years agoPost 8
DJDAZ

rrVeteran

Perth Western Australia

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Definately B

I have asked that myself before

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