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Cox Engine of The Month
August-2024
balogh's
![](https://i.servimg.com/u/f95/15/46/86/41/1_balo14.jpg)
"Cox TD09 R/C Beast of Burden featuring Kamtechnik head and DIY metallic fuel nipple"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
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balogh's
![](https://i.servimg.com/u/f95/15/46/86/41/1_balo14.jpg)
"Cox TD09 R/C Beast of Burden featuring Kamtechnik head and DIY metallic fuel nipple"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
Roddie's flat-bottomed boat..
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Re: Roddie's flat-bottomed boat..
Interesting design roddie
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
Levent Suberk- Diamond Member
- Posts : 2233
Join date : 2017-12-24
Location : Türkiye
Re: Roddie's flat-bottomed boat..
Levent Suberk wrote:Interesting design roddie![]()
Thanks Levent.. It's a prime candidate for the jet-pump.. but will have to see how the test tub/fixture works out first..
Re: Roddie's flat-bottomed boat..
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.
rsv1cox- Top Poster
Posts : 10928
Join date : 2014-08-18
Location : West Virginia
Re: Roddie's flat-bottomed boat..
They got potential roddie bee looking to see what you decide .
![Popcorn](/users/3015/29/34/60/smiles/1347041234.gif)
getback- Top Poster
Posts : 10326
Join date : 2013-01-18
Age : 67
Location : julian , NC
Re: Roddie's flat-bottomed boat..
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](https://i.servimg.com/u/f76/18/50/45/90/roddie31.jpg)
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](https://i.servimg.com/u/f76/18/50/45/90/pump_i12.jpg)
![Roddie's flat-bottomed boat.. 20240189](https://i.servimg.com/u/f76/18/50/45/90/20240189.jpg)
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](https://i.servimg.com/u/f76/18/50/45/90/roddie29.jpg)
I used everything including the kitchen sink for this test...
![tongue](https://2img.net/i/fa/i/smiles/icon_tongue.png)
![Roddie's flat-bottomed boat.. Roddie30](https://i.servimg.com/u/f76/18/50/45/90/roddie30.jpg)
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.
Re: Roddie's flat-bottomed boat..
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.
OVERLORD- Diamond Member
- Posts : 1799
Join date : 2013-03-19
Age : 58
Location : Normandy, France
OVERLORD- Diamond Member
- Posts : 1799
Join date : 2013-03-19
Age : 58
Location : Normandy, France
Re: Roddie's flat-bottomed boat..
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.
Re: Roddie's flat-bottomed boat..
The boat remains a tail dragger and the stern will always stay in the water.
OVERLORD- Diamond Member
- Posts : 1799
Join date : 2013-03-19
Age : 58
Location : Normandy, France
Re: Roddie's flat-bottomed boat..
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.
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.
![Small Cox Logo](/users/3015/29/34/60/smiles/7356.png)
![Thumbs Up](/users/3015/29/34/60/smiles/1541798026.gif)
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 61
Location : Brad in Texas
![-](https://2img.net/i/empty.gif)
» Roddie's Tee Dee .09
» Looking at roddies home-built custom muffler
» Proof of concept, testing roddies postage stamp mount idea
» O.S. FS 40 Marine
» So which model to build now? ...
» Looking at roddies home-built custom muffler
» Proof of concept, testing roddies postage stamp mount idea
» O.S. FS 40 Marine
» So which model to build now? ...
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