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Finely polished Cox .049 with exhaust collector.




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Relative performance of "stock" Cox .049 reedies Empty Relative performance of "stock" Cox .049 reedies

Post  Jim Howell Thu Aug 15, 2019 4:10 pm

I am trying to find out about the relative performance of the many different named Cox .049 reedies.  I've searched this thread using "performance" as my search parameter.  I get a significant number of interesting threads about improving the performance of specific models, but am having difficulties trying to find relative comparisons of stock engines.  I would appreciate it if someone could point me to a place where this type of info might be available.  TIA.

Context for my question is that over the years, I have acquired a variety of different "named" versions.  Why, I haven't a clue other than nostalgia.  Some are 50+ year old engines - mostly gummed up - from my youth, some from friends getting out of the hobby, some from eBay, and some from current suppliers.  However, I'm getting slowly sucked back into small 1/2A C/L models from Black Hawk hollow logs, to Goldberg re-dos, to more modern designs.  While I could bypass my Cox hoard, I'd rather try to find some usage for my nostalgia hoard.  I have the following versions that I have listed in my perceived order of performance from lowest to highest:

Baby Bee
Golden Bee
Black Widow
Product Engine
Killer Bee
Venom

and something from CIE called a "Stinger" that I have no clue as to it's performance.  (I bought it 'cause the case had been anodized (?) to an orange color.    Smile )

Any insights, objective or subjective would be appreciated.

TIA,
Jim Howell
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Post  Surfer_kris Thu Aug 15, 2019 6:25 pm

The best collected Cox engine knowledge and history is found here: Martin Hepperle

Here is an example of what you might be after:

Relative performance of "stock" Cox .049 reedies Cox_performance_2
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Post  Jim Howell Thu Aug 15, 2019 8:13 pm

[quote="Surfer_kris"]The best collected Cox engine knowledge and history is found here: Martin Hepperle

Thanks for the vector to Hepperle's site.  I did not know about that site.  I found a wealth of information there.  Thank you!
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Post  aspeed Thu Aug 15, 2019 8:37 pm

It mentions the other sizes as well. There is nothing on the product, Killer Bee or Venom variants.
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Post  Jim Howell Thu Aug 15, 2019 8:59 pm

@aspeed wrote:It mentions the other sizes as well. There is nothing on the product, Killer Bee or Venom variants.
Yes, I spent some time looking at the descriptions of a variety of Cox products. Yes, I noticed that nothing showed up on these variants. Sad Plus, I noticed that there was some discussion about the later Killer Bees being a step back from the earlier versions. Don't know which version I've got. Got to do some more investigation.

Thanks
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Post  davidll1984 Fri Apr 10, 2020 1:30 am

lok plz on back plate of ree dee as y did same test need referance stock model back plate as y found special part in ventury of cars ree dee from pinto wit fan flyweel get  12k to16 bump to17 len on side ? with golden bee cylinder on cars smal reed tank back plate on and plane crank case 6x3 winsor prop wil test wit stock plate as soon posible with strange back plate get 22 to 23 000 rpm wit diferent cylinder it has no spi two port 1 boost eatch exaust wit fin in exaust slit is a reed engine is capable of sutch result ? stock tee dee dont get close to 23 consistent run on bench wit 6x3 winsor nylon prop my run hole tank at 22k rpm bump to23 on side let oil escape and get higher rev stay 22 23 consistent hole tank 1 minute


Last edited by davidll1984 on Fri Apr 10, 2020 2:31 am; edited 1 time in total
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Post  F4D Phantom II Fri Apr 10, 2020 1:37 am

Hello Jim
                       In here you will find almost all the Cox engines test by Peter Chinn and others of stock engines the place is sceptre flight other engine test can be found nitro and diesel.
                                                                                                             Juan

http://sceptreflight.com/Model%20Engine%20Tests/Index.html
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Post  davidll1984 Fri Apr 10, 2020 1:40 am

no result on golden bee 2 black widow 2 is two vertion of engine for them kiler bee 1 vertion is said bether but 2 of gold and widow is bether?
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Post  aspeed Fri Apr 10, 2020 3:18 am

All the crankcases are the same.  The biggest difference is the cylinders.  The single bypass cylinders are slower.  That would be the Babe Bee and Golden Bee, and I believe the Surestarts.  The twinport ones are faster with the squared off bypass ports better yet.  Some of the reedies have a different intake hole in the tank which can improve performance a bit too.  Maybe the BW Killers and Venoms are this.  Of course variations like high compression heads, piston fit/tapers, SPI and mufflers change results. Myself, I would never use the low compression heads, but if I can't find a twin port or TD cylinder, the single one is OK.  Many on this forum are more enlightened than me, but that is what I have found over 50 years.  The newer ones I have no idea as I got away from them in the 1990s pretty much.
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Post  Jim Howell Fri Apr 10, 2020 1:28 pm

@F4D Phantom II wrote:Hello Jim
                       In here you will find almost all the Cox engines test by Peter Chinn and others of stock engines the place is sceptre flight other engine test can be found nitro and diesel.
                                                                                                             Juan

http://sceptreflight.com/Model%20Engine%20Tests/Index.html
Juan,
Got it, thank you for the link! Some great info here that I was not aware of.
Jim
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Post  fredvon4 Fri Apr 10, 2020 3:03 pm

I have seen this chart several times

OK Virginia...tell the class why it is bogus and NOT Apples to Apples
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Post  63expert Fri Apr 10, 2020 6:56 pm

@fredvon4 wrote:I have seen this chart several times

OK Virginia...tell the class why it is bogus and NOT Apples to Apples


Pretty much this.

Scientific method is a real thing.
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