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Search: Posts Made By: bradleyjdonaldson
Forum: Newport   05-07-2008
Replies: 1
Views: 1,572
Posted By bradleyjdonaldson
N30 bow hatch

I knew it was going to happen some day. I was motor sailing to weather in 20 kts with 3 ft chop. Somewhere along the way I lost the anchor hatch cover off the bow. Anybody have any idea where to find...
Forum: Gear & Maintenance   05-30-2006
Replies: 0
Views: 996
Posted By bradleyjdonaldson
Mast Shake/Pumping

When I am in the dock and the wind is beam the boat, directly off the port or starboard, I get a wobble or pumping of the mast. It is in about 10 kts or stronger wind. The mast wobbles in the center...
Forum: Seamanship & Navigation   05-19-2006
Replies: 55
Views: 9,597
Posted By bradleyjdonaldson
Actually there is NO FRICTION in a free spinning...

Actually there is NO FRICTION in a free spinning propeller on a turbine powered aircraft. There is no mechanical linkage between the propeller and the power turbine. If you watch a pre-flight on a...
Forum: Seamanship & Navigation   05-14-2006
Replies: 55
Views: 9,597
Posted By bradleyjdonaldson
This is base on Aerodynamics, but it is...

This is base on Aerodynamics, but it is essentially the same in Hydrodynamics. The point is "The propeller produces much more drag as it windmills than it would if it simply stopped turning."
...
Forum: Seamanship & Navigation   05-14-2006
Replies: 55
Views: 9,597
Posted By bradleyjdonaldson
A free spinning propeller will have the same drag...

A free spinning propeller will have the same drag as a solid disc of the same diameter. DO NOT LET THE PROP SPIN FREE. Shut down the engine in gear and this should be enough to stop the prop from...
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