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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

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Post  davidll1984 Sun Aug 15, 2021 9:43 pm

today I decided to convert a small boat and install a cox engine I need to do tests with propellers to see the power of the engine The amphibious vehicle is put aside for the moment but I have gathered the parts to build it with the boat I can test different propellers  That I want to use for it This is why I use a transmission with this engine to see if I can turn a larger propeller capable of moving the vehicle at high speed. Test if Too small or too big With the three propeller models that I could find I have to think about leaving power for the wheels in the water I don't really know how to calculate the amount But I'll trust my experience with the snow truck I want to use the same transmission I found a very similar one with the same final ratio in m'y scx10 axial 4x4 truck This is what I made its Not finish That the beginning I want to use the prototype of concealer carburetor that I made Hide in a stunt .049 fuel tank wit exaust collector and tuned pipe engine.   This is my only skidoo engine  Small Cox Logo  Babe Bee .049 kg Hoo
.049 cox powered rc boat Convert to nitro  16290811
    .049 cox powered rc boat Convert to nitro  16290810


Last edited by davidll1984 on Wed Aug 18, 2021 7:50 pm; edited 1 time in total
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Post  944_Jim Sun Aug 15, 2021 10:18 pm

David,
I'm digging this one! Will you run the hull topless, or will you cut out the floor to allow cooling air in the hull?


Last edited by 944_Jim on Sun Aug 15, 2021 10:57 pm; edited 1 time in total
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Post  davidll1984 Sun Aug 15, 2021 10:43 pm

It will be air cooled and water cooled Both the engine is fitted with a small fan on the clutch bell I wanna use the good old copper coil thing But a little more elaborate I want to keep the top Seal off wit just a very small amount of air as much as possible for the engine the exhaust at the back Like a real one I have to build some kind of cover around the fan to redirect the air to the right place The électroniques component place in sealed container i have To buy smal sealed servo Huh...
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Post  davidll1984 Mon Aug 16, 2021 12:48 pm

This morning's progress.049 cox powered rc boat Convert to nitro  16291311
.049 cox powered rc boat Convert to nitro  16291312
.049 cox powered rc boat Convert to nitro  16291310
I still have work to do. Installation of the carburetor back plate prototype I have a good feeling it should work out well This modification allows to have two different jets seting for low rpm jet and hi jet This prototype allows me to use two different types of nitro fuel if I want wit two smal fuel tank Example use on the high jet more oil in the fuel the low speed jet less oil less nitro Allowing the engine to easily start a more precise control for a Good low rpm without flod the engine wit oil The low jet is inside carb barrels its the normal setup for for carb hi jet is the one from the stunt bee tank backplate The air flow decreased in this jet passed through the interior of the tank Works When the carburetor is open
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Post  davidll1984 Mon Aug 16, 2021 12:50 pm

.049 cox powered rc boat Convert to nitro  16291313
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Post  layback209 Mon Aug 16, 2021 12:53 pm

Nice work David, this is turning out fantastic. Like the cooling coil solution very practical. Interested in what you come up with. Popcorn
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Post  davidll1984 Mon Aug 16, 2021 3:43 pm

When it will be functional I will make a little video or two To show how it works Very Happy Small Cox Logo Babe Bee .049
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Post  davidll1984 Wed Aug 18, 2021 11:19 am

i made good progress today Small modification on the prototype carburetor manufacturing and installation of the rear engine support Alignment is good Soon the installation of radio controls The throttle control cable was a bit difficult To instal To find it a correct angle so as not to have its gas stuck to the bottom I have to install the tubes for the water for the cooling Drill the boat hull for the exhaust Much remains to be done At least I didn't have to build the hull He should keep his factory-made appearance I can't wait to see the result I want to hear it on the water Small Cox Logo Babe Bee .049 .049 cox powered rc boat Convert to nitro  16293010
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Post  davidll1984 Wed Aug 18, 2021 7:54 pm

I haven't finished but it's progressing Start of radio control installation .049 cox powered rc boat Convert to nitro  16293310
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Post  getback Thu Aug 19, 2021 7:03 am

Looking Good David , I see you changed engine to use , should bee interesting to see it work This Site Rocks! Popcorn
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Post  davidll1984 Thu Aug 19, 2021 4:11 pm

This engine is completely new and never used it is the engine of a snowmobile. That I modified to use it with an exhaust system plus addition of the hidden carburetor prototype Let's say the whole creative process had a long journey Surely without appearing to be one of the most technologically advanced engines That I was able to build
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Post  1/2A Nut Thu Aug 19, 2021 5:04 pm

Here are some 1/2A engine boat vids.


A Picco .05 car engine put in a scratch built outrigger hydro enjoy.
https://www.youtube.com/watch?v=qEKjR0_JjpA



Picco .05 ran in another scratch built rigger.
https://www.youtube.com/watch?v=Gv7EUv6yfvs


A Cox .049 in a hydro


Small Cox Logo Thumbs Up


Last edited by 1/2A Nut on Thu Aug 19, 2021 6:56 pm; edited 1 time in total
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Post  dckrsn Thu Aug 19, 2021 6:04 pm

You got my attention too, David. I like the hidden carb, seems like a
good idea for this application. Carry on and good luck. I'm hoping the
maiden launch is a big success. Get a little bottle of champagne to christen
her. Thanks for this thread.
  Bob
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Post  rsv1cox Thu Aug 19, 2021 6:18 pm

Great pictures and story David. Thanks for sharing.

Bob
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Post  davidll1984 Thu Aug 19, 2021 7:23 pm

Haha lol!  a little bottle of champagne to christen her. I didn't think about it Laughing  1\2A I have already built a hydroplane like this But electric I had difficulty turning very unresponsive turn Of course, this one shouldn't go very quickly But should be very good in rough water I don't know too well we could have a surprise its m'y first cox powered boat I use a propeller of almost 1 "1 \ 2 and its pitch look hi Not sur This is why I use a transmission system with clutch the goal of being able to slow down and be able to stop without the engine shutting down.The boat's hull is light enough for plastic The dry weight Was less than 400 grams without the tubes to cool 347grams if I remember correctly This boat had a small 180 brush motor or something smaller that was very weak unable to lift it out of the water. The screw did not turn very quickly Brief what you can expect from a walmart toy at  just 25$ a savings on materials to build the hull of the boat Laughing Before the gearing was slow the engine had to turn several turns for a revolution of the propeller (screw) now its 1 1\2 engine turn for a revolution of the screw .049 cox powered rc boat Convert to nitro  16294110
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Post  davidll1984 Fri Aug 20, 2021 10:53 am

.049 cox powered rc boat Convert to nitro  16294710
Small engine test I have to play with the adjustments it starts then stops He drowning in fuel Once the carburetor is set correctly it should work well I think I don't need the pressure from the exhaust Huh... I might change the exhaust system
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Post  rsv1cox Fri Aug 20, 2021 12:41 pm

Delete
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Post  davidll1984 Sat Aug 21, 2021 8:48 am

I finally found the problem was a valve stuck open after the first start I did not position the valve clip well I also believe the gas jets was too open I removed the engine fix the valve problem all replace then all works well now rsv1cox delete the exaust pipe Will not be necessary because the engine keeps good performance wit it i did try Then I withdraw it a gain of some turn But not enough to make it worth it Without the tube, the oil splashes Inside the boat He's finished ready to go on the water I hope I'll have time today it's hot A perfect time for the beach .049 cox powered rc boat Convert to nitro  16295511
.049 cox powered rc boat Convert to nitro  16295510 final weight 547gram Not Not as light as I wanted to keep it
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Post  1/2A Nut Sat Aug 21, 2021 9:20 am



Cox TD .020 Micro 9.5in Crackerbox with throttle sleeve.

Just set up idle and top end shut off by closing the exhaust ports with a throttle sleeve.
1.4x19.8mm Proboat surface prop 2mm drive shaft / static test set a bit rich 25,516 rpm.
Total weight less fuel 194.2g / 6.94oz


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Post  davidll1984 Sat Aug 21, 2021 10:11 am

1\2A Nut I wonder how well the water Cooper coill Cool the engine Mine stationary the water seems to have difficulty circulating properly it should work when it is moving forward Huh... At least the big heat sink helps Your little boat is very cool Surely much faster Thumbs Up
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Post  1/2A Nut Sat Aug 21, 2021 12:28 pm

Yes fast too fast at full throttle in a swimming pool.
Good luck on your project running on water.   Small Cox Logo

These two outrigger hydros / .05 car engine conversions require calm water.

.049 cox powered rc boat Convert to nitro  Vlcsna16

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Post  davidll1984 Sat Aug 21, 2021 4:22 pm

sory last vidéo was the wrong one this is the Good one first test wit Not To Good result lol!
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Post  davidll1984 Sun Aug 22, 2021 9:16 am

Doh! Laughing lol! Last time i posted the wrong vidéo now i just change for the Good one We can see it now
Well by seeing I mean seeing a little
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Post  Yabby Thu Aug 26, 2021 3:39 pm

I really like this David! Ive always been thinking of wanting to build an RC boat, maybe I will one day! :-) I like the idea of using a cox 049 ducted fan to make a model a bit like the water speed record boats. I remember Ken Warby and the Spirit of Australia setting the record way back when..........

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Post  robot797 Thu Aug 26, 2021 3:47 pm

I should sail my cox boat more
maybe this weekend
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