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Cox Engine of The Month
May-2020
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"Medallion .049"



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Post  looperdude on Tue Jul 30, 2013 3:52 pm

i have been thinking about building a rc jetboat using the nqd jet sprint jetboat, i wanted to power the jetdrive with a cox 049, i was just wondering if anybody has done this before or know if it would work or not?
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Post  sdjjadk on Wed Jul 31, 2013 5:08 pm

You have any pics of the boat?
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Post  looperdude on Thu Aug 01, 2013 8:10 am

i do not have anything to build on yet i was just wondering if it would be a waste of money or if it would work
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Post  RknRusty on Thu Aug 01, 2013 8:28 am

There is a sizeable boat community at RCGroups.com. There you could figure out how to choose your turbine and all those technical details. Are you an experienced boat builder? Be sure and keep us posted if you start a build, it would be pretty interesting. Some of our members here have built swamp buggies with pusher props, and I was surprised to learn they're as hard to trim as an airplane. Lots of trial and error to get them to plane out and stay in the groove.

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Post  roddie on Fri Sep 06, 2013 7:31 am

Hey looperdude! I love the idea... It would be a challenge to power a jet-drive with a Cox .049... I've wanted to try that myself.

I would personally research the jet-drives available for elec. motors... and see if you can find one that is rated for a brushless, that's "comparable" to what your model Cox .049 delivers for power. I.E. a Cox Reed-valve .049. is less powerful than a Cox Tee Dee .049...

Here's some performance data taken from "Cox model engine-Wikipedia";

A (rear reed-valve induction) Cox "Black Widow" .049 engine (Cat. #150- Manufactured May 1973-Jan. 1996) was tested by Aeromodeller Magazine in August 1974, and resulted in; 0.08 bhp (60 watts) at 15,000 rpm with a max. torque of 6 oz./in. at 9000 rpm on 25% nitro fuel.

A (front rotary induction) Cox Tee Dee .049 engine (Cat. #170-Manufactured Nov. 1960-Jan. 1996) was tested by Aeromodeller Magazine in 1962, and resulted in; .105 bhp (78 watts) at 22,000 rpm with a max. torque of 5.5 oz./in. at 18,000 rpm on 25% nitro fuel.

If you can't find a jet-drive that is rated for close to these numbers; it's probably not worth it.

If you "do" find one... you'll also need to use a "fly-wheel" designed for the .049 engine. They show up on ebay sometimes, and were made by "Dumas" and "Sterling".

A final note: Be sure to use a heat-sink to cool the engine. Cox made these for their car models. It "clamps" on the top of the cylinder/glow-head with a screw.

(below) pic. showing cooling options. on the left; is a "Dumas" #3601 water cooling clamp, on the right; are the Cox heat-sinks.

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(below) pic. showing Cox heat-sink mounted to an engine

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