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Cox Engine of The Month
June-2024
F4D Phantom II's

"Cox .049 Marine inboard engine."

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Post  roddie Thu Apr 25, 2024 11:36 pm

Another one of my designs.. from the sign-company era. Utilizes 1/2" Ultraboard sides and transom.. and a strip of .030" Polystyrene for a hull. This was a companion design to my outrigger.. but meant to be somewhat of a drift-boat. Maybe that would catch-on?


Roddie's flat-bottomed boat.. Roddie22


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Post  Levent Suberk Fri Apr 26, 2024 12:23 am

Interesting design roddie Very Happy  
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Post  roddie Sat Apr 27, 2024 10:11 am

Levent Suberk wrote:Interesting design roddie Very Happy  


Thanks Levent.. It's a prime candidate for the jet-pump.. but will have to see how the test tub/fixture works out first..
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Post  rsv1cox Sat Apr 27, 2024 6:26 pm

That is so smooth looking roddie.  Looks like you are building three variations.  Drift boat?  No Keel? I'm interested to see how it will turn out.  Power/sail/jet pump or one of each?  You have me guessing.
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Post  getback Sun Apr 28, 2024 6:17 am

They got potential roddie bee looking to see what you decide . Popcorn
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Post  roddie Sun Apr 28, 2024 9:50 am

rsv1cox wrote:That is so smooth looking roddie.  Looks like you are building three variations.  Drift boat?  No Keel? I'm interested to see how it will turn out.  Power/sail/jet pump or one of each?  You have me guessing.


I only plan to build one. The .030" Polystyrene bottom wraps-around the front.. to form the top in one piece. I made a couple different shapes at the top end.. but am partial to the U-shape which provides more access up front.


Roddie's flat-bottomed boat.. Roddie31


I may try a pair of stationary rudders (fins) either side of the transom for some directional stability. The Cox .049 driven jet-pump is the plan here.. so there shouldn't be as much (if any) of the paddle-wheel effect that's found when using a surface-drive propeller. The little pump needs to mount to a flat floor that's also thin enough to sandwich between the intake port and grate. The test fixture that I built for the pump has the same polystyrene floor.


Roddie's flat-bottomed boat.. Pump_i12


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The sides being of 1/2" foam should provide enough buoyancy to keep the model afloat in case it takes-on water. Actually.. let's see just how much buoyancy the sides alone provide..  

I've got the pair of them placed under a cooling-rack in order to support a vessel for adding weight.

Roddie's flat-bottomed boat.. Roddie29

I used everything including the kitchen sink for this test...  tongue

Roddie's flat-bottomed boat.. Roddie30

24.2 oz. is quite a bit of buoyancy.. and actually; the number is a little higher than that.. but the fixture is tricky to balance. As it was; the sponges were needed to act as baffles.
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Post  OVERLORD Sun Apr 28, 2024 10:11 am

Roddie, Wouldn't you consider a stepped hull? The contact with the water surface will be a lot less and the boat will be flatter on the water.
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Post  roddie Sun Apr 28, 2024 12:55 pm

OVERLORD wrote:Roddie, Wouldn't you consider a stepped hull? The contact with the water surface will be a lot less and the boat will be flatter on the water.


Hi Lieven, do you mean a stepped V-hull? My little RC Sprint Boat has a jet-pump drive and it does have a V-hull.. albeit a shallow Vee.


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Post  OVERLORD Sun Apr 28, 2024 1:40 pm

No, what I mean is a step in the flat bottom as on airplane floats.

Roddie's flat-bottomed boat.. Img_2057
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Post  roddie Sun Apr 28, 2024 1:49 pm

OVERLORD wrote:No, what I mean is a step in the flat bottom as on airplane floats.

Roddie's flat-bottomed boat.. Img_2057


That's actually what I thought you meant.. but I don't think it will work with the jet-drive. As soon as the hull starts to rise.. the intake will start to suck air. If I ran a "surface-drive".. (exposed propeller) it would be a different story.
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Post  OVERLORD Sun Apr 28, 2024 2:20 pm

The boat remains a tail dragger and the stern will always stay in the water.
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Post  1/2A Nut Sun Apr 28, 2024 10:51 pm

Spotted this ..



Mini bluebird boat with Cox tee Dee 010

Peter Maylor
65 views Nov 2, 2019
Mini scale blue bird built from scrap box as a ducted fan propulsion but needed a bit of extra
power so added IC .so when engine stops can bring back on edf.

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