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"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."



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Post  Iceberg on Tue Aug 11, 2020 1:44 pm

I recently obtained an original QRC that was dirty but after cleanup was found to be in very good condition. Seems maybe only run a time or two then shelved.

I have run it on a plane of mine. I must admit that I'm not incredibly impressed with performance however with the muffler sounds a bit like a mosquito flying by. It does run quite decent lower end of the power spectrum however due to low BHP run time is pretty good. Running over three minutes.

Question: What planes were fitted with this motor in which years? I know it must be mid 70's when noise was starting to be an issue. But what planes did cox fit with this interesting looking motor?

Thanks
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Post  Marleysky on Tue Aug 11, 2020 2:20 pm

I have a Cox Cessna ( or maybe it’s a EZ Bee) and a Cox Sportavia that shows the Red, Silver and Blue “QRC” on the box, but inside mounted on the plane is just the all silver extended tank “Silver Bee” with a muffler.
I assumed that Estes ran out of the Red anodized tanks, and just substituted the regular aluminum tank. Yeah, the mufflers didn’t provide any help in the power output of the engines, that’s for sure!

QRC .049 History 9fa11610


Last edited by Marleysky on Tue Aug 11, 2020 3:14 pm; edited 1 time in total
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Post  Levent Suberk on Tue Aug 11, 2020 2:54 pm

Cessna 182 Skylane:

QRC .049 History Post-610


Cessna 210 Centurion:

QRC .049 History Screen59
QRC .049 History Screen58
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Post  Levent Suberk on Tue Aug 11, 2020 2:57 pm

Cox Sportavia:

QRC .049 History Img_2038

QRC .049 History Screen60

(Images from worthpoint.com)
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Post  Marleysky on Tue Aug 11, 2020 3:12 pm

THANKS Levent! Nice pictures of the boxes and planes! RED silver and blue on the box , just plain silver on the plane! lol!
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Post  Cryhavoc on Wed Aug 19, 2020 8:34 am

Marleysky wrote:I have a Cox Cessna ( or maybe it’s a EZ Bee) and a Cox Sportavia that shows the Red, Silver and Blue “QRC” on the box, but inside mounted on the plane is just the all silver extended tank “Silver Bee” with a muffler.


Since the QRC was my first engine associated with an R/C plane I've held them in esteem. Recently I've been refurbishing several of them I've collected through the years. Since the only ones I had previous experience with were the all silver ones in the RTF planes I didn't think much about it until I pulled them out to see what was needed to bring them back up to snuff. After doing the best I can to find pics and info, I've come to the conclusion there were three stages plus an Estes period in their production history.

Ver 1, The first ones, had a brass backplate, red tank, silver crankcase & spinner cone, standard round prop drive with the old red style snap starter. MH Aerotools mentioned some had brass standard round prop drives???
Ver 2, which is the iconic image people associate with QRCs came out shortly afterward with the zero drag spring start and the blue spinner cone. Later iterations of these came out with the new style hex prop drive w/grey snap starter and plastic backplates.
Ver 3, is the all silver versions that were included in the RTF planes. These had the new style hex prop drives and grey snap starter. I don't think it was a matter of "running out of colors" for Cox as much as lets keep the production costs cheap and keep the fancy colors for the consumer boxed engines. I distinctly remember mine had a Brass backplate but they moved to the black plastic ones shortly afterwards. I also think some came with Brass hex prop drives.
Estes, by the time Estes got a hold of things is when the consumer boxed versions started coming out with whatever parts were available whether they had colors or not. Basically if it had an 8cc stunt tank and a muffler, it was a QRC.

Mike
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QRC .049 History Empty Have used EZ Bee for trade or ??

Post  happydad on Wed Aug 19, 2020 4:24 pm

Iceberg wrote:I recently obtained an original QRC that was dirty but after cleanup was found to be in very good condition. Seems maybe only run a time or two then shelved.

I have run it on a plane of mine. I must admit that I'm not incredibly impressed with performance however with the muffler sounds a bit like a mosquito flying by. It does run quite decent lower end of the power spectrum however due to low BHP run time is pretty good. Running over three minutes.

Question: What planes were fitted with this motor in which years? I know it must be mid 70's when noise was starting to be an issue. But what planes did cox fit with this interesting looking motor?

Thanks
Iceberg

Iceberg: someone in the forum, nitrosmeller and I, have 2 used EZ Bee’s for sale or trade , or ??

PM if interested. I have shown pics before. I can’t from this iPad currently.  

Happydad. RC Plane Old Bugger        Canada    Hand Shake     United States
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Post  rsv1cox on Wed Aug 19, 2020 6:29 pm

My EZ Bee just calls it a muffled Babe Bee.

QRC .049 History P1010444
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QRC .049 History P1010447

Early QRC in the crystal box.

QRC .049 History P1010448
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Post  dckrsn on Wed Aug 19, 2020 7:56 pm

Here's one. I think I have another with a small brass drive plate somewhere around here.

QRC .049 History Dsc05310
Bob
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Post  Cryhavoc on Thu Aug 20, 2020 12:57 am

rsv1cox wrote:My EZ Bee just calls it a muffled Babe Bee.

Early QRC in the crystal box.

QRC .049 History P1010448

Its my understanding the Baby Bees with the muffler were called QZ .049s for "Quiet Zone".

Nice QRC! I've got one of these but it needs a tank. Kinda holding out til I can get my hands on an original red one.

Mike
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Post  Cryhavoc on Thu Aug 20, 2020 1:05 am

dckrsn wrote:Here's one. I think I have another with a small brass drive plate somewhere around here.

QRC .049 History Dsc05310
Bob

Beautiful!

My early, pre-blue spinner cone stuffed in my display with some other early engines.

QRC .049 History 01b_co10
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Post  rsv1cox on Thu Aug 20, 2020 7:07 am

Nice collection.

I especially like the RR-1 and the packaged Space Bug.

And, my thinking was......why didn't they label the engine on the EZ package as a QZ rather than just a Babe Bee,,
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Post  davidll1984 on Mon Aug 24, 2020 11:24 am

ho y tink QRC is like gtp older style exaust manifold look ez bee is not rc exaust is dragon fly use same QRC .049 History Image202
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Post  davidll1984 on Mon Aug 24, 2020 11:29 am

my wit new mufler QRC .049 History Image203
not rc just silensed
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Post  MrGoodwreck on Mon Aug 24, 2020 12:58 pm

Absolutely one of the coolest posts I have read in a while. Very Happy
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Post  Cryhavoc on Sun Aug 30, 2020 12:36 pm

davidll1984 wrote:my wit new mufler

not rc just silensed

Very cool stuff David. Kind of a QZ-Car engine. Love the "modern" QRC, might have to build one myself Thumbs Up

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Post  davidll1984 on Sun Aug 30, 2020 9:47 pm

rc exaust on cars giving same performance tink exaust from ez bee is litle bether wit heat trap ful close sound good les noise just drop of rpm on cars trap wont fuly close
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