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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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Cox powered jet-pump for model Sprint Boat

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Post  rsv1cox Sun Feb 11, 2024 6:13 pm

Everytime I see one of your nicely conceived red .049 mufflers roddie it reminds me of the one you sent me. Don't give up hope, I will get to testing it. But I have just been overwhelmed with activity lately.

Bob
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Post  roddie Sun Feb 11, 2024 10:19 pm

rsv1cox wrote:Everytime I see one of your nicely conceived red .049 mufflers roddie it reminds me of the one you sent me.  Don't give up hope, I will get to testing it.  But I have just been overwhelmed with activity lately.  

Bob

No worries Robert. I understand completely. Thumbs Up
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Post  roddie Fri Feb 16, 2024 5:59 pm

This is a plunger/needle for the Ace/Cooney venturi-throttle designed for the Cox Bee (.049 reed-valve) engines. The backplate has an air-intake, consisting of a .063" diameter hole which is directly on-center with the engine's four tank-screws; making it easier to drill a guide-hole through the firewall for the .062" diameter plunger to pass through and into the backplate.

I want to be able to throttle the engine while the pump/drive is submerged.. to see "if" and "how far" I can throttle-down.

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Post  rdw777 Sat Feb 17, 2024 1:37 pm

That’s an interesting way to throttle a reed valve engine roddie, I’ve seen your video and looks like it could be made to work well and the boat is a good application….. Something to consider to help idle: …. Some of the guys in our club would rig a micro switch so that the throttle servo arm would engage it at idle position….. The switch turned on power to the glow plug from an onboard 1.2 volt nicad cell to help reduce flame outs at low idle…..The onboard could serve for starting as well…. A boat could carry something like this easily
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Post  robot797 Sat Feb 17, 2024 1:45 pm

oh I cant wait for the firsth tests!!!!
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