#9 6 years ago

Steering problems

Hi Graham.
Plenty of things to try then...I'm sure you'll find the best solution.👍

I would wish that my 'ducks feet' suggestion works best and it's more in keeping too 😁🤣
Rob.

"Time flies like an arrow; fruit flies like a banana"

Liked by hmsnostalgia and Martin555

#8 6 years ago

Steering problems

Thanks for the suggestion JB.

The hull does have a bow - its not very clear in the original photos. The top drawing shows the hull shape under the duck (in red). I'm going to try a couple of fins (shown in green) as these will be easy to add. The second drawing shows a view from the stern.

If that doesn't work, I'll look to extend the fins forward to produce a solution more like your suggestion.

Graham93

Liked by Martin555 and robbob

#7 6 years ago

Steering problems

Hi Graham,
I don't know about expert.
I just tinker and if it works it works, and if it don't then think again LOL!!!

Martin555.

If it looks right it probably is.

#6 6 years ago

Steering problems

Thanks Rob,

I’m not sure about adding feet 😉, but I will try adding a temporary keel to see if that fixes it.

Graham93

Liked by Martin555

#5 6 years ago

Steering problems

Thanks Martin,

It’s good to hear from an expert that I’m on the right track 👍

Graham93

Liked by Martin555

#4 6 years ago

Steering problems

Hi Graham, how about putting a bow on it ? as the round shape has no direction and would 'roll' around the centerline (especially with a jet unit which is very directional). You could incorporate Robs idea re the ducks feet for trailing fixed 'rudders'. It wouldn't have to be a sealed buoyant bow extension, just an open top and drain holes in the bottom perhaps.

JB

Liked by Ianh and Graham93 and

#3 6 years ago

Steering problems

Hi Graham.
I think you've answered your own question with the keel solution.
I no hydrodynamicist 🤓 but I think the flow of water about a keel is to some extent responsible for the lateral stability as you called it just as a propellers wash about a rudder enable steering.
Try experimenting with a temporary keel of some sort, perhaps something in plastic 'gaffer taped' to the underside to see if that improves matters.
Perhaps adding some trailing 'ducks feet' as rudders would be worth trying too?
Rob

"Time flies like an arrow; fruit flies like a banana"

Liked by hmsnostalgia and Ianh and

#2 6 years ago

Steering problems

Hi Graham,

I think you hit the nail on the head when you said about fitting a keel.

I have seen a few models similar and they all had keels fitted.

Martin555.

If it looks right it probably is.

Liked by Graham93 and jbkiwi

#1 6 years ago

Steering problems

I have a problem with my latest model (I hesitate to call it a boat!!) so I'm looking for advice on how to fix it.

PD Donald propulsion is provided by a water jet with steerable nozzle. The pictures are to give an idea of the hull shape. The problem is that it is very difficult to travel in a straight line. 🤔 Very easy to turn, and almost spin on the spot, but controlling it to sail straight is virtually impossible. I have reduced the throw on the steering nozzle, but it hasn't made much of a difference.

Any suggestions on how to fix this would be most welcome. My thoughts are I need to add something like a keel sticking down below the hull to give some lateral stability?

Graham93

(PD = Paddle Duck 🤣🤣)

Liked by robbob

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