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

"Cox Tee Dee .051 RC Marine"



PAST WINNERS
CEF Traveling Engine

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Post  OVERLORD Sun Mar 10, 2024 3:26 am

getback wrote:Popcorn You need to work at NASA to put the thing together tongue

Yes Eric, one has to think ahead constantly and always measure twice. The most difficult part is yet to come. The stator blades need to be trimmed to fit into the outer tube. When measuring the stator centre diameter - and thus radius - and the stator blade lenghts, I will have to take off 1,75 mm from each blade. But that is the  theory. I will have to be careful in sanding and try regularly the fit. Also, everything need to be centered and the rotor must turn freely when fitted.


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Post  getback Sun Mar 10, 2024 10:58 am

thats not going to bee fun !! Shocked
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Post  OVERLORD Sun Mar 17, 2024 6:06 am

I sanded some material off the stator blades and now, this all fits into the outer tube. It was not any easy task as the blades are not evenly spread around the circumference and also because the outer tube is not rigid. But when inserted, the fan turns free.

TD 09 Ducted Fan - Page 4 P3170511


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TD 09 Ducted Fan - Page 4 P3100510



In way of the black mark, I have to grind a bit away from the cooling duct because that's where the fixing screws go for the upper stator blades.



The tank/engine/rotor assembly is not only supported by the stator blades but also by 3 aluminium tubes and screws to be installed around the engine mount base in a Y. Kress includes wing-profiled tubes in the kit and they are too long as one could imagine. These tubes are difficult to hold for cutting or grinding, therefore I use aluminium tube with 4mm inner diameter to fit the #6 screws. The lenght of the tubes has to be determined by trial and error.. The #6 screws are 1 1/2" long and are too big. when used like this, they will protrude into the engine mount centre hole which houses silicon tubing. I will cut 10mm off each screw. That leaves 28 to 30mm and is enough to screw well into the engine mount.

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Post  getback Sun Mar 17, 2024 8:41 am

Looks Good I was thinking you had to cut the impeller blades down ,but am sure it was still a job getting the turbine holder ? Straight and even ! Looking forward to a test run St.Pats Beers
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Post  OVERLORD Thu Apr 04, 2024 1:55 pm

I finished the engine mount supporting tubes. The screws where cut down to 30mm and the tips sharpened. It all holds together and the rotor turns freely. The stator blades where fixed to the outer tube by small screws and nylon washers. The construction is now finished.



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Post  Boats13 Thu Apr 04, 2024 4:04 pm

Looks professionally built!
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Post  roddie Thu Apr 04, 2024 4:29 pm

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That is slick as snail snot.. Cool
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Post  OVERLORD Fri Apr 05, 2024 7:34 am

Thanks guys. I'm glad I got this thing puzzled together finally. Now, there should be some testing carried out, but I 'm thinking of leaving that task to somebody else. I have no experience with new Conquests. The liner seems to be tapered, by hand it' s impossible to pass TDC. And I don't possess an electric starter.
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Post  getback Fri Apr 05, 2024 8:49 am

Oh man that looks Great alot of fun went into that !! You would have to heat the head/cyl. to gat it to turn over easy enough to start w/out the elect. starter i don't know how you would ? Know anyone with one ? Smile
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Post  1/2A Nut Fri Apr 05, 2024 10:05 am

A starting trick is to loosen the glow plug, another is you will have to pull the engine and break it in
with a air prop on the bench. During this time you can prewarm the engine in the sun or with a blow dryer.
-worth sourcing a elect. starter for yourself to enjoy the engine!
- there are wrap around warmers for hot car engines that run off 12v.

After the engine is well broken in you can put it back in the fan system for
a whole new level of fun.


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Post  OVERLORD Sat Apr 06, 2024 2:10 am

Yes, for breaking in that engine, it has to come out for sure. There is also the muffler that's needed or a tuned pipe. More and more, I'm thinking of sending the lot to Sweden. But surfer_kris doesn't know it yet! He knows the Conquest very well and I'm sure he will bring all this to a good end (or beginning) without damaging the engine.
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Post  getback Sat Apr 06, 2024 7:13 am

That sounds like a plan hope Kris will bee willing to help you out . I feel he will , I had forgot about the tricks that Brad was talking about been a minute since i have broken in a ABC engine although I do have a few ! Very Happy This Site Rocks!
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Post  rsv1cox Sat Apr 06, 2024 7:23 am

I just reviewed this whole thread started way back in 2019.

I hope that it works out for you Lieven, worthy project. I have seen ducted fans flown, the A-10 Warthog for instance. Impressive. It seems like your enemy would be vibration, but the only way to check that out would be to run it.

I like your MIG-15 picture. Build one around it.

TD 09 Ducted Fan - Page 4 Mig15_10
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Post  OVERLORD Wed Apr 10, 2024 2:11 pm

This appeared in Flying Models. This airboat was designed for the bigger ducted fan but I'm sure it can be scaled down:

TD 09 Ducted Fan - Page 4 Aqui_d10


TD 09 Ducted Fan - Page 4 Aqui_d11


TD 09 Ducted Fan - Page 4 Aqui_d12
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