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Very Hot Topic (More than 25 Replies) Royal Aircraft Factory BE 12a (Read 105339 times)
John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #70 - Mar 25th, 2014 at 11:59am
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This bank of cylinders is completed.  Gumby did some calculations.  When both banks of cylinders are finished, the cylinders alone will contain 504 components.
  

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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #69 - Mar 24th, 2014 at 3:48pm
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We have an engine police here??  I was unaware of it!  Possibly because it does not exist.  I never made a abstract engine that will probably have 500 parts, and never will again Cheesy
  

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BillParker
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Re: Royal Aircraft Factory BE 12a
Reply #68 - Mar 24th, 2014 at 2:06pm
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John, you better be careful or the "fun police" are gonna show up and put a stop to this thing.

Just wonderful!

Stay with it!

bp

  

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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #67 - Mar 24th, 2014 at 11:46am
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The shaping of the cylinders is complete.  Now the valve train detailing begins.  This stage complete, on to the other cylinder bank.
  

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Sky9pilot
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Re: Royal Aircraft Factory BE 12a
Reply #66 - Mar 24th, 2014 at 1:02am
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Outstanding job JohnO...I'm sure that without your supervision and direction Gumby would be lost!!!!
Love the mockup!
Tom
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #65 - Mar 23rd, 2014 at 4:28pm
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The Gumster torques a bolt for a cylinder test fit.  He fabricated a new crankcase today and the redesign worked better than expected. The basic shaping of the cylinder set is not yet completed but Gumby put a quick coat of paint on them and hastily installed them into the crankcase for a “look see”.  He has been at engine construction for over a week and there is quite a bit of work remaining.  That’s why I pay him well over minimum wage.  Model fabrication pays better than making burgers at Burger King!
  

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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #64 - Mar 22nd, 2014 at 5:38pm
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It is, the diminutive variety.
  

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Sky9pilot
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Re: Royal Aircraft Factory BE 12a
Reply #63 - Mar 22nd, 2014 at 5:34pm
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Seems that there is always something to challenge us every step of the way!  Good luck on the new crankcase!  Have Gumby use his milling skills to hone up a new case for you!  The rocker and spring/valve is looking really good!  Looks like that rocker might be a "T" pin.

Tom
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #62 - Mar 22nd, 2014 at 4:54pm
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Good news/bad news....well not too bad of news!  The GOOD: The cylinder assembly is progressing.  I have a prototype of a valve mechanism in mind and one cylinder has a rocker arm valve stem and spring.  My valve springs will be represented by coil springs.  The real thing uses a spiral spring similar to a coiled inclined plane.  A spring of this design is beyond my spring winding skill level.  The BAD: The slightly modified kit crankcase is destined for the scrapheap.  I extended it a tad to accommodate a more realistic cylinder array, but I did not extend it enough. I should have extended to the end of the fuse frame...live and learn.  Fabricating a new, closer to scale, crankcase should  not be a problem and actually it will make adding magnetos,  spark plug wires, intake manifold, fuel lines, and the behemoth exhaust stacks a bit easier.  Further cylinder assembly on hold until a suitable crankcase can be designed and constructed.  I discovered an interesting fact regarding this engine.  A lack of redundancy.  While it used two magnetos, it had only 12 spark plugs.  Each magneto servicing six cylinders,
  

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Sky9pilot
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Re: Royal Aircraft Factory BE 12a
Reply #61 - Mar 21st, 2014 at 6:55pm
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JohnO...now you and Gumby have all the details worked out.  The second build would be much easier!  Did "G" sleep till noon on you? Grin Wink

Tom
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #60 - Mar 21st, 2014 at 4:56pm
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Slowly, very, very slowly the RA4 engine takes shape.  Our first and last build of a 12 cylinder air cooled engine in detail.
  

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John M Oshust
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Re: Royal Aircraft Factory BE 12a
Reply #59 - Mar 20th, 2014 at 9:27pm
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11:30pm here and he is still out and about.  I am afraid he will not be worth very much tomorrow AM. He will probably sleep in to about noon.
  

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Sky9pilot
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Re: Royal Aircraft Factory BE 12a
Reply #58 - Mar 20th, 2014 at 9:22pm
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JohnO...that's part of what makes your builds so interesting and amazing!!!  Keep up the great work and take good care of your assistant.  Green is cool! But don't tell him I said so!!!
Toms
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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John M Oshust
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I love aero planes...my
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Re: Royal Aircraft Factory BE 12a
Reply #57 - Mar 20th, 2014 at 9:19pm
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Tom,
I always seem to do this.  I also have machine guns to fabricate.  I already built the wheels.
  

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Sky9pilot
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Re: Royal Aircraft Factory BE 12a
Reply #56 - Mar 20th, 2014 at 9:12pm
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You are building a model in a model.  I'm glad to see the partial mockup.  Don't be to hard on Gumby.  A little of R&R will get more production from him in the future!!!

Tom
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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