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[boilerhole]

cheers derek
sadly i dont know of any prefab hulls for coble's that exist and has i build mine from scratch out of larch on oak  i doubt you could make a fibreglass one without destroying the original
i will post some photos of the build has i took some along the way when i built it so it could be repeated if necessary although i like to make it as near to the original as possible and every coble is slightly different in character because it was designed by the fisherman that bought it for his exact requirements
the photo is of love divine which is from my home village and was built in whitby by clarksons it is a double ender similar to the coble but it has a bow at each end coble's are flat stern  long time since i have seen that d/ender about dont know what happened to it
going to order the bits required today to start the rc  but not quite sure whether to go for lipo or nimh might try both just to see how it balances the boat has i have put the speaker for the diesel sound emulator right at the bow and its a bit heavy so Will try to balance it out

[john s 2]

If the speaker is a little to heavy or large then you may wish to fit a smaller one. Just make sure the Ohms are the same ,probably 4 ohm and that the wattage is suitable. You probably will not want the sound very high. If running on a budget then old radios are a source or try your local recycling centre.John.

[slug]

dear boilerhole what a lovely model if of interest i dont know if you are uk based orion mouldings do a couple of f/g coble hulls they seem very nice seen a couple at shows they all seem to have small motors 400 size hidden under engine cover batteries under floorboards or netting etc steering is by a control rod fitted to one side of rudder if you look at orions web page under gallery some models of cobles on it some photoes on fishing forum maybe dribble but i hope of some help  slug

[slug]

dear boilerhole just came across another site www.danwalker.co.uk/boats.html looks interesting  slug

[nick_75au]

Hello Derek,

1 inch prop at 5000 RPM 4.7 Mph assuming no slip 7.6 Kph
                  At 700 RPM 0.66 MPH                     1.0 Kph

Assuming 50% slip going by my springer which is worse at 65% (theoretical 10.7 Kph actual 3.7 Kph) and I don't think our little props can achieve anywhere near 25%+ like the big boats...... Those figures above will be halved.

What do you think?

Nick

[derekwarner]

Morning Nick......I cannot dispute calculations, however consider there is a vast difference between a springer & a cobble

  ----- the former has the hydrodynamic finess of a floating brick with rounded corners
  ------the latter is more like an under water greyhound 

Possibly best if boilerhole could further research  ....to validate the actual cobble engine speed....... Derek

[Subculture]

Agreed. If you took that 1000kv motor and 40mm prop and installed it in a slim hull designed to cut elegantly through the water you would see much more impressive figures.

[nick_75au]

I don't disagree with different hull forms having different speed, but you cant achieve 0% slip. I dont think the OP would be happy with somewhat less than 0.66 Mph which was the point of my calculations....
Its all speculation until the prop size is known in any case

Nick