Wedger Posted April 23, 2009 Report Share Posted April 23, 2009 Anyone know where I can get a calculation for duoprops please. Just gone to a 290 DP-e but can't find a calculation. Quote Link to comment Share on other sites More sharing options...
oysterboats Posted April 23, 2009 Report Share Posted April 23, 2009 have you tried propcalc web site Quote Link to comment Share on other sites More sharing options...
Wedger Posted April 24, 2009 Author Report Share Posted April 24, 2009 Do you have the address for the prpcalc site please? I've not got DP on the Castle Marine bit i've downloaded. Quote Link to comment Share on other sites More sharing options...
Rob Posted April 24, 2009 Report Share Posted April 24, 2009 Trev, If you calculate the standard 3 blade prop you would neeed, could the DuoProp dealer advise you of the "equivilant" Duo? I have no idea what I am talking about, but, it is good to talk!! R Quote Link to comment Share on other sites More sharing options...
duncan Posted April 24, 2009 Report Share Posted April 24, 2009 Do you have the address for the prpcalc site please? I've not got DP on the Castle Marine bit i've downloaded. none of them do Terry you have the same engine and revs available, so you only really need the relative gear ratios of the leg you took off and the one you are putting on to give you a relative starting point. and that should probably be the same pitch as the one you are taking off if the ratios are the same DP doesn't really change the underlying formulae but you will get less slip at outset and more efficency carried through the range - this can mean that you need to go lower if the engine can't get to turbo revs before the hull speed becomes a limit (previously it would simply have slipped the prop with the avaiable power but now it may not be able to) - or it may not. from there it's fine tuning on the various choices you have available in that range for which a calculator really won't help! Quote Link to comment Share on other sites More sharing options...
Wedger Posted April 24, 2009 Author Report Share Posted April 24, 2009 I need a rest Thanks dunc. Quote Link to comment Share on other sites More sharing options...
Coddy Posted April 25, 2009 Report Share Posted April 25, 2009 Trev you have a PM Coddy Quote Link to comment Share on other sites More sharing options...
Wedger Posted April 25, 2009 Author Report Share Posted April 25, 2009 Thanks Dave Quote Link to comment Share on other sites More sharing options...
oysterboats Posted April 25, 2009 Report Share Posted April 25, 2009 if propcalc no good try mike bellamy at lancing marine he is a very knowlegeable guy and may be able to help Quote Link to comment Share on other sites More sharing options...
Wedger Posted April 25, 2009 Author Report Share Posted April 25, 2009 thank you chaps. Quote Link to comment Share on other sites More sharing options...
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