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.15 Rotary Drum Bill Atwood

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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sun Feb 03, 2013 8:28 pm

Here is a picture of the rear drum assembly on mine.



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Re: .15 Rotary Drum Bill Atwood

Post  Mudhen on Sun Feb 03, 2013 8:31 pm

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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sun Feb 03, 2013 8:38 pm

Thanks Gents,

That thing is a work of art. I always wondered how the drum was driven and how the rotor actually rode in the drum. Now I know! Wouldn't it be great if we could put bearings into a TD?

Thanks again,

Ron


Last edited by cribbs74 on Sun Feb 03, 2013 8:45 pm; edited 1 time in total
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sun Feb 03, 2013 8:44 pm

Mudhen wrote:
Did you clean/polish those parts Mud??
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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sun Feb 03, 2013 8:47 pm

Are the extra holes in the drum for indexing of sorts?

Ron
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sun Feb 03, 2013 8:52 pm

You rotate the drum in different positions for timing purposes, hence the multi hole configuration...at least that's the way I understood it Ron.( Rotary Drum) I cannot believe how clean that engine Mud posted is!!! It looks like new!!
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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sun Feb 03, 2013 8:54 pm

Thanks Lew,

What a great design, way ahead of it's time. Unfortunate for non-collectors like me who will never be able to own one. Oh well..... Very Happy

Did you ever seal the deal Lew?
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sun Feb 03, 2013 9:06 pm

Not yet Ron....He has 3 engines I want.... .15 Rotary Drum, .09 Tee Dee R/C, .15 Special...I'm going to give him a cash offer on the three and I will tell you the results Buddy.
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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sun Feb 03, 2013 9:19 pm

ZACATTACK wrote:Not yet Ron....He has 3 engines I want.... .15 Rotary Drum, .09 Tee Dee R/C, .15 Special...I'm going to give him a cash offer on the three and I will tell you the results Buddy.

Well, I certainly hope it goes your way. It was a great find Lew
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Re: .15 Rotary Drum Bill Atwood

Post  Mudhen on Sun Feb 03, 2013 11:30 pm

ZACATTACK wrote:Did you clean/polish those parts Mud??
I did.
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sun Feb 03, 2013 11:34 pm

Can you tell exactly what you used and did to get those parts looking great like that Mud!!?? Jesus that engine looks new!!

Lew
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Re: .15 Rotary Drum Bill Atwood

Post  Mudhen on Mon Feb 04, 2013 10:59 pm

Rubbing alcohol - to clean all the parts.
Muriatic acid - to clean the rotor, crankshaft, outside piston barrel, cylinder walls. (Not recommended if you’ve never used it before.)
XXX steel wool - to clean the crankshaft threads, glowhead, cylinder wall, inside venturi, inside crankcase, inside venturi housing, and all threads.
Bleach - to clean the plastic venturi housing.
2000 grit - to resurface the crankshaft, crank pin, rotor pin, rotor, and piston barrel.
Safety pin - to clean the crankshaft knurling.
Novus #3 - to polish all the parts.
Dawn dishwashing liquid - to clean the parts after the Novus.
Warm running water - to flush out all the parts before reassembly.
3 in 1 oil - for assembly
Mud
oh ya - computer air - to blow out all the parts before oiling.
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Re: .15 Rotary Drum Bill Atwood

Post  zeissman on Tue Jun 04, 2013 2:25 pm

ZACATTACK wrote:

i'm concerned about this crack on this rare engine...these dont come around to often and may not have another opportunity to purchase one...aint going to be cheap!! ...there is also numbers etched in the mounting braket on the one side...Was this a regular thing Bill Atwood did with all his rotary engine prototypes?? It looks authentic..but kind of rough. Tell me what you guys think..you seem to guige my wallet in the proper direction...I dont know much anbot the motor that's why the etching and crack is of concern!! Thanks as usual!

Is this engine actually for sale? If so, I'm am seriously interested in making an offer!
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What ever happened to this Olympic Prototype?

Post  zeissman on Fri Aug 02, 2013 11:38 am

Hello Lew,

What ever happened to this Olympic Prototype?  Did you find out more about it?  Did you end up buying it?  

ZACATTACK wrote:

i'm concerned about this crack on this rare engine...these dont come around to often and may not have another opportunity to purchase one...aint going to be cheap!! ...there is also numbers etched in the mounting braket on the one side...Was this a regular thing Bill Atwood did with all his rotary engine prototypes??  It looks authentic..but kind of rough. Tell me what you guys think..you seem to guige my wallet in the proper direction...I dont know much anbot the motor that's why the etching and crack is of concern!! Thanks as usual!
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Re: .15 Rotary Drum Bill Atwood

Post  WingingIt74 on Fri Aug 02, 2013 11:51 am


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Re: .15 Rotary Drum Bill Atwood

Post  zeissman on Wed Dec 31, 2014 4:58 pm

You guys will be pleased to hear that the "Type B" Prototype recently sold on eBay ...

http://www.ebay.com/itm/1-of-2-RARE-COX-THIMBLE-DROME-ATWOOD-OLYMPIC-15-MODEL-AIRPLANE-ENGINE-15-RACING-/351250680818?pt=Radio_Control_Parts_Accessories&hash=item51c82c0bf2

... has remained within the Cox Engine Forum family.  IOW, I'm the one who bought it.  Also, I can confirm that everything about this engine looks as it should.  IOW, it looks to be an original Atwood "Type B" prototype.  I even examined the plastic under UV light and it fluoresces the same as the plastic from my genuine "Type A" prototype, and the tank from my genuine space bug Jr.

The one thing I doubt though, is the claim that only two of these "Type B" prototypes were ever built.  I know that this claim is made on page 53 of the Cox Model Engine Handbook by Dannels & Sitter.  I can also infer from the photo credits on Martin Hepperle's website that the version in his collection is also this "Type B" prototype.  [http://www.mh-aerotools.de/airfoils/cox_olympic_15_rotary.htm].  Also, look at those two huge display cases on page 68 of the Cox Model Engine Handbook.  I suspect that a "Type B" prototype rests in one of those cases.

I know that in April of 2012, another one of these "Type B" prototypes with the "ears" on the carb body sold on eBay.  It was sold by Ronald Valentine.  You can still view the pictures on the ebay listing at this URL.

http://www.ebay.com/itm/Very-Rare-1965-Cox-Olympic-15-Prototype-Model-Engine-Only-50-Manufactured-/310393373917?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_nkw%3D310393373917%26_rdc%3D1&nma=true&si=I2gAr1KCjG96KvRxxlzdsbL1iD4%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

If you compare the pics of that engine with the pics on Martin Hepperle's site, you can see that they appear to be different engines.  Remember that the one in the pics on Martin's site have a trimmed down brass cylinder reinforcing the threads for the venture.  The pics of that "Type B" have been on Martin's site long before Ronald Valentine's auction.  The person who sold his "Type B" Prototype to me said it had been in his personal collection for almost 20 years.  Thus, my "Type B" and the "Type B" sold by Ronald Valentine were 2 different engines.  As neither one is the same as the one in Martin Hepperle's collection, then that means there are at least 3 "Type B" engines extant.

I guess what I am asking for is if anyone has any additional information regarding the number of "Type B" prototypes produced, I would greatly appreciate hearing about it.  For example, if anyone has a "Type B" prototype, or knows someone who used to have one, or currently has one, please let me know.  I would like to put together a more accurate estimate of the number of these produced.

Thanks folks!
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Re: .15 Rotary Drum Bill Atwood

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