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Building Tips and technical articles. => Building techniques => Topic started by: Tim Wescott on August 13, 2014, 08:01:22 PM

Title: Why engineer when you can over-engineer?
Post by: Tim Wescott on August 13, 2014, 08:01:22 PM
This is for a "quick and dirty" test pig.  Two machined pieces of aluminum, screwed & glued onto a phenolic bellcrank, with a shaft pressed through the middle.

Is there an over-engineers anonymous?
Title: Re: Why engineer when you can over-engineer?
Post by: Mark Scarborough on August 13, 2014, 11:14:16 PM
Tim,, if there is,, you should know being the president and all,,

of course Randy and Pat might argue I am vice pres ( though I have learned)
Title: Re: Why engineer when you can over-engineer?
Post by: FLOYD CARTER on August 14, 2014, 09:49:28 AM
Doesn't look extreme to me.  A thin phenolic bellcrank doesn't have enough bearing surface to last very long.

I would have done the same.

F.C.
Title: Re: Why engineer when you can over-engineer?
Post by: Randy Powell on August 14, 2014, 03:19:15 PM
Hey, after losing a plane to a under-engineered bellcrank, I want one I can lift my car with.
Title: Re: Why engineer when you can over-engineer?
Post by: Tim Wescott on August 14, 2014, 03:36:14 PM
Doesn't look extreme to me.  A thin phenolic bellcrank doesn't have enough bearing surface to last very long.

I would have done the same.

F.C.

I was also trying to achieve a bellcrank that wouldn't rock.
Title: Re: Why engineer when you can over-engineer?
Post by: Phil Krankowski on August 14, 2014, 05:58:18 PM
Elegant actually, definitely not a brick outhouse.

Phil
Title: Re: Why engineer when you can over-engineer?
Post by: Steve Fitton on August 25, 2014, 09:38:28 PM
For a disposable test plane, why not a top flite 3 inch nylon bellcrank?  The one you made looks ready for a Nats plane.
Title: Re: Why engineer when you can over-engineer?
Post by: Tim Wescott on August 25, 2014, 11:42:27 PM
For a disposable test plane, why not a top flite 3 inch nylon bellcrank?  The one you made looks ready for a Nats plane.

I wanted a four inch.  I have several 3" ones -- but I wanted 4".
Title: Re: Why engineer when you can over-engineer?
Post by: Randy Powell on August 26, 2014, 10:35:12 AM
Well, Tim, I have a grossly over-engineered carbon fiber bellcrank I make. I could send you one of those.