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Cox Engine of The Month
September-2020
sosam117's

"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  Cox International on Thu Apr 02, 2020 5:16 pm

Targets:

End of May
$14.95 (includes anodizing in black or whatever colour)
Aluminium backplates 049_ba10
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Aluminium backplates 049_ba12
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Post  NEW222 on Thu Apr 02, 2020 5:32 pm

Bling, bling. Nice and shiny! The square fill tube looks nice and solid too.
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Post  Levent Suberk on Thu Apr 02, 2020 5:38 pm

Very Happy Fuel filling hole is square shaped. Plain aluminum looking fine, and yellow (gold) anodized version will be good.
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Post  aspeed on Thu Apr 02, 2020 5:55 pm

The mounting ears look stock. That was a weak point, as were the dimpling of the backplate when tightening the back screws. It is cheaper when machining to leave it thicker. I am guessing it is CNC milled. Not saying I would get one, but it may be good to design that in if it is not too late.
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Post  Cox International on Thu Apr 02, 2020 6:03 pm

Yes CNC and the final design is still being worked on and also simplified, as every cavity and web will not be required, as aluminium is stronger than the cast zinc version.
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Post  getback on Thu Apr 02, 2020 6:14 pm

Cox International wrote:Targets:

End of May
$14.95 (includes anodizing in black or whatever colour)
Aluminium backplates 049_ba10
Aluminium backplates 049_ba11
Aluminium backplates 049_ba12
Can i get mine in Gold lol! No just funning !!
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Post  Cribbs74 on Thu Apr 02, 2020 6:20 pm

They look great!

They also look very strong. What size it the venturi hole?
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Post  Cox International on Thu Apr 02, 2020 6:34 pm

Cribbs74 wrote:They look great!

They also look very strong. What size it the venturi hole?

The samples are at Matt's place but probably 0.082" as that was in the drawing we sent the vendor.

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Post  Cox International on Thu Apr 02, 2020 6:36 pm

However, they will make whatever venturi hole we ask for. I would say the smallest hole that Cox made them with (Texaco) and we bore open to suit for other engines.
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Post  Jason_WI on Thu Apr 02, 2020 6:55 pm

Those look great. I would definitely make the mounting lugs thicker. If some volume is lost for a thicker backplate where the screws secure it to the crankcase I think most would be happy with that too.
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Post  EXModelEngines on Thu Apr 02, 2020 7:07 pm

Jason_WI wrote:Those look great. I would definitely make the mounting lugs thicker. If some volume is lost for a thicker backplate where the screws secure it to the crankcase I think most would be happy with that too.

That's the goal. As Bernie has stated, the 'final' is still being tweaked, but rest assured this is being addressed as part of that.
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Post  andrew on Thu Apr 02, 2020 10:02 pm

Will these have a needle seat insert? If I'm reading the drawing correctly (a BIG if), the seat is off-center in the side view and the metal at the base of the seat is very thin -- if the seat is centered, front to back, it appears it will break through the thin base. Secondly, will you be completing the drilling of the fuel nipple in house or is the vendor supplying a finished backplate. The fuel nipple, as shown, is not drilled through.

OTOH, since this appears to be a partial print, then ignore my prattling since this may be addressed in other drawings.
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Post  Ada99 on Fri Apr 03, 2020 2:20 am

Any possibility of a version without the fuel nipple for use with stunt tanks?

Best Regards,
=Adrian=
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Post  Oldenginerod on Fri Apr 03, 2020 4:55 am

I don't see the need to add unnecessary weight by "beefing up" certain areas. As Bernie said, the fact that it is machined from solid aluminium rather than weak cast alloy, the mounting lugs and retaining screw seats would be far stronger than the originals. Since the aluminium will be heavier than cast, I'd suggest that adding extra material would be counter-productive.
Just my thoughts.

Rod.
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Post  balogh on Fri Apr 03, 2020 5:03 am

Cox International wrote:However, they will make whatever venturi hole we ask for. I would say the smallest hole that Cox made them with (Texaco) and we bore open to suit for other engines.

There is not too much meat where the venturi meets the mixing chamber, so changing that venturi diamater seems to be a challenge..
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Post  Levent Suberk on Fri Apr 03, 2020 7:49 am

Oldenginerod wrote:I don't see the need to add unnecessary weight by "beefing up" certain areas.  As Bernie said, the fact that it is machined from solid aluminium rather than weak cast alloy, the mounting lugs and retaining screw seats would be far stronger than the originals.  Since the aluminium will be heavier than cast, I'd suggest that adding extra material would be counter-productive.
Just my thoughts.

Rod.

Aluminum is lighter than cast alloy like as zamac. Am I wrong?
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Post  EXModelEngines on Fri Apr 03, 2020 8:43 am

Levent Suberk wrote:
Oldenginerod wrote:I don't see the need to add unnecessary weight by "beefing up" certain areas.  As Bernie said, the fact that it is machined from solid aluminium rather than weak cast alloy, the mounting lugs and retaining screw seats would be far stronger than the originals.  Since the aluminium will be heavier than cast, I'd suggest that adding extra material would be counter-productive.
Just my thoughts.

Rod.

Aluminum is lighter than cast alloy like as zamac. Am I wrong?

You are correct. A quick weight of the prototype (with spraybar) is 6.31 grams versus a cast Babe Bee backplate of 11.03 grams.
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Post  Cescoturbo on Fri Apr 03, 2020 9:17 am

wow, that's nice , i have to wait the official releasing for another order Very Happy Very Happy
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Post  Cox International on Fri Apr 03, 2020 12:09 pm

As Matt is spearheading this project, one can rest assured that it will be done right.

They will be lighter, yet stronger
Changing venturi diameter will not be a problem
Yes, there will be a spraybar for the needle valve. Nothing will break – only partial drawing uploaded
Yes, there will be a stunt-tank version
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Post  Cescoturbo on Fri Apr 03, 2020 12:13 pm

reading about venturi hole size, how many measures are existent?
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Post  Cox International on Fri Apr 03, 2020 12:31 pm

Cescoturbo wrote:reading about venturi hole size, how many measures are existent?

Three at least, perhaps four
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Post  Cescoturbo on Fri Apr 03, 2020 6:51 pm

Cox International wrote:
Cescoturbo wrote:reading about venturi hole size, how many measures are existent?

Three at least, perhaps four

hi, just checked on my collection,
on black plastic oem black widow and other same period it is very large, close to 2mm
on yours black plastic plates ( just delivered with big order here in italy) a bit smaller, 1,7/1,8mm but i could enlarge easy
on older plate (golden bee, baby bee, ) is close to 1,5mm

your future 0.082" is as black widow
that's good
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Post  Tee Bee on Sat Apr 04, 2020 3:31 am

Looks promising! I've been meaning to repair my Venom II which developed backplate issues after a short bit of use. Need to get it going by summer and this should be the hot ticket if it is gonna be available with the larger venture opening. Thanks for the efforts, fellas!
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Post  getback on Sat Apr 04, 2020 9:17 am

This sounds Great !! stunt plate too Eyebrows I guess Cox Inter. and EX Models both will have these ? Popcorn
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Post  EXModelEngines on Sat Apr 04, 2020 9:51 am

getback wrote:This sounds Great !! stunt plate too Eyebrows I guess Cox Inter. and EX Models both will have these ?  Popcorn

Yes, correct.
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