The Shipyard ( Dry Dock ): Builds & Questions > BMPRS - British Model Powerboat Racing Society

prop shaft on submerged drive hulls

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Brigadair:
hi all and happy new year etc!!!!




Just a quick question.


This one is related to submerged drive hulls.


I'm building a couple over these cold dark winter months.


What are the reasons for filling in the void between prop shaft and hull?


I've run most of my boats with the gap between prop shaft and hull filled in.




Or is it more beneficial to leave a gap say with just the Skeg supporting prop tube.


Any advice appreciated.


Thanks


Garry

Den W:
  Ask Bernard ,  he will tell you

Brigadair:
Thanks Den.


Have done.


What are your views?

Den W:
when ever I install sub shafts I use flexis.and try to keep them as close to keel line as poss,almost parralell,leaving around 6" from prop to transom,placing rudder about 2" from transom ..worked exstreamly well on an old Esprit I had...(wish I still had it)  hopes this helps   regards  Den

triumphjon:
i only have submerged drive on any of my models , always try to have as shallow an angle as possible , you need the thrust to push the boat along , too steep & it wants to push the bow down , you need the hull up onto the plane for best performance , as for infilling the gap between the stern tube and bottom of hull , it will aid in supporting the stern tube
 what did bernard suggest

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