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.15 Rotary Drum Bill Atwood

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.15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 2:15 pm



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!


Last edited by ZACATTACK on Sat Feb 02, 2013 2:25 pm; edited 2 times in total
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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sat Feb 02, 2013 2:22 pm

Lew,

The carb bodies are prone to cracking on those. Even with the crack it's still very valuable. Shoot Jason_WI a PM and he can help. He is the only one I know who has one on here.

Ron
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Cash

Post  ZACATTACK on Sat Feb 02, 2013 2:26 pm

Any ideas Ron a fair price?? If you zoom in you can see the number etching!!
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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sat Feb 02, 2013 2:30 pm

ZACATTACK wrote:Any ideas Ron a fair price?? If you zoom in you can see the number etching!!

Shoot Lew, I really have no idea. Those are so far out of my league that I have never paid attention. That and it's the second one I have ever seen. What is the seller asking? You could ask the seller about the etched numbers. That is not your everyday Cox engine. So my guess is since he has it he knows all about it.
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 2:38 pm

Yeah..but Im buying alot from him Ron ..so things are a little different...he asked me to shoot out an offer!! Really dont know what to do Ron...I'm like you, there is a posting in here Ron that one sold on E-Bay for $386.00 recently but when I click on the link...NO Pictures appear!! So getting info on these engines is tuff !!! There were only 50 made!! I'll find the link and post in here!! Found it!! No Picture!!

https://www.coxengineforum.com/t1084-cox-olympic-15-rotary-drum-your-chance-to-get-one


Last edited by ZACATTACK on Sat Feb 02, 2013 2:41 pm; edited 1 time in total
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Re: .15 Rotary Drum Bill Atwood

Post  Mudhen on Sat Feb 02, 2013 2:41 pm

Any damage to an engine that is unquestionably a prototype is not relevant. The value of the engine is not affected, particularly when its status as a prototype can be irrefutably determined. Missing parts is another matter.
To settle on an offer, I will usually decide the maximum I’m willing to pay, cut that number in half, and start there.
Mud
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Re: .15 Rotary Drum Bill Atwood

Post  John Goddard on Sat Feb 02, 2013 2:44 pm

I've seen three go on fleebay Lew since I joined the Forum about 15 months ago, lowest I think was
in the 220's, highest was 4 plus.
There was a thread somewhere about someone (might've been Jason) repairing the plastic. Very Happy
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 2:46 pm

With this engine...opportunity does'nt come knocking more then once...Like Man..There's only 50 guys on the planet that has possesion of these!! Look at that Ad I posted...That seems like a fair price!! bounce I'm glad someone chimned in and set me straight on the cracks and being a prototype!! When Jason chimes in ...we will see if his .15 Atwood Rotary has numbers etched....it looks like the number 30 and then a 3 etched on the mounting bracket if you look closely and zoom in. Maybe Jason will know if these are sinifigant in any way?
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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sat Feb 02, 2013 3:53 pm

Mine doesn't have any numbers engraved on the crankcase. My carb body is cracked at the mold line like the one in the picture above. What ever plastic they used shrunk over the years and that is what caused the crack. My pressure port was drilled out also.

Mine was stuck tight from castor use when I got it. Used a considerable amount of heat to get it loosened up. It also took a considerable amount of heat and force to remove the carb body from the drum valve housing as I think it was shrunk tight to the aluminum.

I made a rubber tool mold to recreate the carb body. The problem with these carb bodies is the resin these are made of is not fuel proof. If you soak this in glow fuel it will get soft and then crumble in your hand. I ran my Olympic with the replacement carb body and it held up but it did get a little pliable but did not crack.

As to the value I believe these are more valuable than a NIB Venom or a NIB RR-1. As long as all the pieces are there you are in good shape. The cracked carb body does not affect the value of this engine.

I'm not selling carb bodies as I do not want fakes made. Any competent Mechanical engineer worth his salt can make a rubber tool mold for this and then pour carb bodies if you really want a replacement.
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 4:57 pm

Jason...So I can assume this engine is an authenic example of the elusive, rare .15 prototype rotary valve Bill Atwood engine?? confused
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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sat Feb 02, 2013 5:03 pm

Everything on the outside looks correct and the same as mine except the the numbers engraved in. Could have had some slight internal differences and they marked it to keep track when testing them.
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Re: .15 Rotary Drum Bill Atwood

Post  Mudhen on Sat Feb 02, 2013 5:18 pm

I have a few RR-1 rotors and Medallion cases with numbers etched on them. Dale Kirn told me they represented the various degrees for port opening. Engineers kept a record to determine the best performance. This may be what the numbers on your engine indicate. I doubt, but could be wrong, that the numbers indicate quantity.
From the pictures I'd say it was authentic.
Mud
Jeez...it's like 80 here in S.D. anyone else cold? Cold
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 6:54 pm

Off TOPIC AT BIT: Was there not a Rare Medallion .051 Frre Flight motor made with engravings on it? I thought i read this somewhere where only 1000 .051 Medallion's were engraved from Cox, It was the free-flight association in accordance with Cox that released these engines??!! On another note:Those being engineering tracking marks on the .15 Rotary makes perfect sense being a ptototype type engine and 50 of them in diferent parts of the USA, those markings make sense!
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 7:10 pm

So a good offer would be $400 ya think ??? The guy probably wont take that... I think paying more then that would be foolish!! Someone PMMED me a price one sold for that I dare not repeat on here!! The lowest was $223.00 so far!!
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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sat Feb 02, 2013 7:16 pm

paid $760 for mine. It's only money. Can't take it with you unless you plan on sewing pockets in your coffin.

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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sat Feb 02, 2013 7:31 pm

$760 affraid Maybe a little too much Jason? Your engine does look beautiful and the price of admission to the Bill Atwood Rotary Club is very steep indeed...There's only 50 membership cards out there!! Smoking Congrats on that find Jason!
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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sat Feb 02, 2013 7:52 pm

Depends on how bad you want the engine. For me I simply wanted it and pulled the trigger.
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Re: .15 Rotary Drum Bill Atwood

Post  ahrma_581 on Sun Feb 03, 2013 2:16 pm

Notice the carb body bears a passing resemblance to a std TD part (even has a pressure bleed nipple). Wonder if a stocker couldn't be adapted/hogged out inside just for running the engine?

Just noticed on aerotools that the Oly carb body also had a molded in alu bushing for the rotary valve, which complicates things.


Last edited by ahrma_581 on Sun Feb 03, 2013 2:22 pm; edited 1 time in total (Reason for editing : "Just noticed...")
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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sun Feb 03, 2013 2:34 pm

The drum valve housing is not molded into the carb body. I was able to remove it on mine. The TD 15 carb body pressure nipple is on the opposite side. Might work but wouldn't look the part.
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Re: .15 Rotary Drum Bill Atwood

Post  Mudhen on Sun Feb 03, 2013 2:58 pm

Jason_WI wrote:paid $760 for mine. It's only money. Can't take it with you unless you plan on sewing pockets in your coffin.
$700.00 for mine. Worth every penny.
Mud
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Re: .15 Rotary Drum Bill Atwood

Post  ZACATTACK on Sun Feb 03, 2013 6:44 pm

Mudhen wrote:
Jason_WI wrote:paid $760 for mine. It's only money. Can't take it with you unless you plan on sewing pockets in your coffin.
$700.00 for mine. Worth every penny.
Mud

You Guys pay all that cash that you say is worth every penny and dont even post a picture!!! Thats just a shame...Please post pics of your pride and Joy!!
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Re: .15 Rotary Drum Bill Atwood

Post  Jason_WI on Sun Feb 03, 2013 6:57 pm

Here is one better. A video of mine running last July. I doubt anyone else that owns one of these has ever run it.

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Re: .15 Rotary Drum Bill Atwood

Post  Cribbs74 on Sun Feb 03, 2013 8:09 pm

Any of you high rollers Wink happen to have a picture of the innards? How are the bearings fitted? And what's going on inside that drum?

Just curious, I don't want you guys to tear them down or anything.
Ron
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Re: .15 Rotary Drum Bill Atwood

Post  microflitedude on Sun Feb 03, 2013 8:25 pm

cribbs74 wrote:Any of you high rollers Wink happen to have a picture of the innards? How are the bearings fitted? And what's going on inside that drum?

Just curious, I don't want you guys to tear them down or anything.
Ron


https://www.coxengineforum.com/t749-cox-olympic-rear-drum-valve-engine-details-now-with-video?highlight=olympic
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