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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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Post  Admin Sun Feb 03, 2019 2:22 am

I've had these pictures in my head for quite awhile now but couldn't locate them for the life of me! I finally came across them on one of my old HDDs. Not named properly of course.

These were from an eBay auction back in 2011. These are the only and best pictures I have from the auction.

If you look closely, you can see horseshoe backplates that are really made for an .020. Also looks like the orange choke tube is for the .020 backplates. In addition, are white plastic tank bowls and tank backplates. Hard to tell what is in the bags in the back, if I recall, I believe it was spray bars and .049 backplates and choke tubes...

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Anyone remember seeing this stuff, or better yet, anyone here buy the stuff?


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From the Cox Model Engine Handbook by Tim Dannels and Dan Sitter

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Post  66 Malibu Sun Feb 03, 2019 9:26 am

I have one of the Pee  Wee .020 Sure Start prototypes with the white horse shoe back plate and the orange choke tube.
It has a large "2" etched on the side of the back plate.
It came from the large Cox R&D spare parts lot that came to Georgia in 2009.
I did not see the particular eBay auction that you pictured but I did see another Pee Wee Sure Start that was auctioned a couple of years later from the Denver area in a very large batch of parts.
Unfortunately, my bid was sniped and I missed it.
It looks like a small batch of parts were produced but only a few were actually assembled.
No way to know, only wild guess.
FYI, Steve
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Post  getback Sun Feb 03, 2019 9:35 am

I don't remember seeing this before But sure is cool and i would think if someone here had them we would have heard about it Laughing I like the look of the white back plates they stand out nicely , and for .o20 reedie may even up the rpms with some mods. Eyebrows Cool 66 Malibu Small Cox Logo
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Post  SteveM Sun Feb 03, 2019 9:42 am

Very cool, thanks for sharing! Very Happy
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Post  roddie Sun Feb 03, 2019 2:44 pm

I'd like to see that .020 "horseshoe" back-plate "3-D printed" by our "JasonWI" if it was possible. Maybe Steve would be willing to mail his backplate to Jason for scanning?

I don't know if Jason has 3-D scanning software.. but even if he doesn't.. he may still be able (from what I've seen..) to draw the part. I'm not implying that it would be an easy task. To the contrary; it would likely be laborious.. but the outcome would be quite beneficial to anyone who owns a Cox Pee Wee engine with plans on running it in a model. A back-plate such as this would allow the application of a larger-capacity fuel-tank for the little reed-valve engine. With today's featherweight radio-control/battery components.. one could build an amazing little airplane with extended flight-time.

The control-line applications for Cox .020 Pee Wee engines would enjoy longer engine run-times by being able to utilize external fuel tanks.. and possibly even pressure-bladders.

The only other Cox .020 "product-engine" reed-valve back-plates that I know of; came with their Ryan PT Army Trainer.. and the Sky-Copter

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Post  NEW222 Sun Feb 03, 2019 3:06 pm

While I would really like one of those backplates as I have a crankcase only .020 here, I wonder about the needle assembly. Would it be an 049 needle assembly, or would those have to be made as well in a smaller size?
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Post  getback Mon Feb 04, 2019 9:14 am

The needles are available https://coxengines.ca/cox-pee-wee-.020-needle-valve.html I dont think a CNC printer can make the caitive for the needle boss with the appropreate holes , and were would you get the insert anyway?
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Post  66 Malibu Mon Feb 04, 2019 4:05 pm

Roddie,
I saw your thoughts of maybe Jason scanning the parts for 3-D printing. If we lived near each other I would get with him and do it.
UPFRONT I'm not going to let the unit out of my possession because of all the lost and unrecovered shipments that I've had of late by UPS and USPS !!!!
Since it's all digital info anyway maybe Jason can find a way for me to scan locally and email to him.
I'm totally ignorant of the process /procedures so any help is appreciated...
Steve...
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Post  Jason_WI Mon Feb 04, 2019 6:16 pm

I would draw it up from a combination of the pee wee tanks, the helicopter, and Ryan back plates. Something that precise 3D scanning isn’t goint to cut it. The resolution of my scanner is .1mm. It seems small but for something that needs to seal properly that is a huge tolerance to overcome.

I don’t blame you for not sending something that rare out. I wouldn’t either.

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Post  SteveM Mon Feb 04, 2019 7:23 pm

Would love to have one of the 020 backplates...
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