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my "twin bee"

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my "twin bee"

Post  chris74100 on Sun Sep 02, 2012 12:14 pm

I started the machining of the crankshaft of my twin baby. Here are some pics.
The crankshaft is same as the twin "Gmark"













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Re: my "twin bee"

Post  fit90 on Sun Sep 02, 2012 12:31 pm

Sweet! It looks like a lot of work. You must be very patient. Thanks for sharing.

Bob
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re: great job

Post  happydad on Sun Sep 02, 2012 4:35 pm

chris74100 wrote:I started the machining of the crankshaft of my twin baby. Here are some pics.
The crankshaft is same as the twin "Gmark"






great job and thanks again for posting. mitchg95 are you watching this?? happydad Small Cox Logo

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Re: my "twin bee"

Post  mitchg95 on Mon Sep 03, 2012 6:21 pm

happydad wrote:
chris74100 wrote:I started the machining of the crankshaft of my twin baby. Here are some pics.
The crankshaft is same as the twin "Gmark"






great job and thanks again for posting. mitchg95 are you watching this?? happydad Small Cox Logo

Futaba Radio RC Plane


i sure am Smile looks great Chris Smile
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Re: my "twin bee"

Post  chris74100 on Tue Sep 04, 2012 3:55 pm

Today, i'm machining the crankcase.





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Re: my "twin bee"

Post  RknRusty on Tue Sep 04, 2012 5:42 pm

Those are wonderful skills you posses, Chris. Thanks for sharing it with us.

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Re: my "twin bee"

Post  chris74100 on Wed Sep 05, 2012 1:24 pm

Crankcase next





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Re: my "twin bee"

Post  Admin on Wed Sep 05, 2012 2:00 pm

Lookin' good! Very Happy

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Re: my "twin bee"

Post  chris74100 on Sat Sep 08, 2012 10:53 am

first cylinder

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Re: my "twin bee"

Post  chris74100 on Sat Sep 08, 2012 12:23 pm

And the second

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Re: my "twin bee"

Post  Cribbs74 on Sat Sep 08, 2012 1:28 pm

You have done a really nice job Chris, I do hope you get a video of it running.

Are you planning on doing any work to the tank/intake? I am sure the extra cylinder will require more fuel and air flow.


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Re: my "twin bee"

Post  chris74100 on Sat Sep 08, 2012 1:43 pm

The normaly tank for the baby bee is a 5cc tank. With the twin is a 8cc tank .
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Re: my "twin bee"

Post  Cribbs74 on Sat Sep 08, 2012 2:45 pm

chris74100 wrote:The normaly tank for the baby bee is a 5cc tank. With the twin is a 8cc tank .

True, just that the venturi hole and fuel inlet is sized for a single cylinder. It may work fine for two, just thought I would bring it up. It may be something you already thought of anyway.
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Re: my "twin bee"

Post  John Goddard on Sat Sep 08, 2012 3:03 pm

cribbs74 wrote:You have done a really nice job Chris, I do hope you get a video of it running.

Are you planning on doing any work to the tank/intake? I am sure the extra cylinder will require more fuel and air flow.


Ron

Agreed on the nice job. Very Happy
I was wondering about fueling as well
Huh...
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Re: my "twin bee"

Post  chris74100 on Sun Sep 09, 2012 11:47 am

the motor is finished, it more does not remain than to start it









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Re: my "twin bee"

Post  ahrma_581 on Sun Sep 09, 2012 12:27 pm

Very nice Chris. How about a picture cutting the cylinder threads in the crankcase? Think that would be one of the trickiest parts of the project, both setup and the fine threadform.

Not too late to submit to "Engine of the Month".

What size prop?
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Re: my "twin bee"

Post  RknRusty on Sun Sep 09, 2012 12:32 pm

Beautiful! I can't wait to see it run.

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Re: my "twin bee"

Post  chris74100 on Sun Sep 09, 2012 12:52 pm

the prop is a 8x6 master airscrew, but it's so big, a 7x4 is better
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Re: my "twin bee"

Post  John Goddard on Mon Sep 10, 2012 8:50 am

You might not have seen this Chris and may find some of it interesting.
Very Happy
http://modelenginenews.org/cardfile/gm12.html


Last edited by John Goddard on Wed Sep 12, 2012 7:14 am; edited 1 time in total
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Re: my "twin bee"

Post  ekitten2 on Tue Sep 11, 2012 11:05 pm

absolutly beautiful work!! ive oftern thought of doing one aslo esp tp put in a scale rc j 3 cub project ive had in mind for years...now a four cly one would be exelant iffa only i could figger out how to do it
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Re: my "twin bee"

Post  Jason_WI on Tue Sep 11, 2012 11:32 pm

Chris,

Are the cylinders threaded into the crankcase?

Jason
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Re: my "twin bee"

Post  ian1954 on Wed Sep 12, 2012 6:21 am

John's link not quite right. Try this.

http://modelenginenews.org/cardfile/gm12.html




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Re: my "twin bee"

Post  John Goddard on Wed Sep 12, 2012 7:15 am

ian1954 wrote:John's link not quite right. Try this.

http://modelenginenews.org/cardfile/gm12.html





Nice one Ian
Welcome to the forum
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Re: my "twin bee"

Post  chris74100 on Wed Sep 12, 2012 11:25 am

Jason_WI wrote:Chris,

Are the cylinders threaded into the crankcase?

Jason

Yes threading with the lathe
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Re: my "twin bee"

Post  chris74100 on Thu Sep 13, 2012 2:54 pm

This day, first starting for my twin cox.
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Re: my "twin bee"

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