I want to attach a mast and sail to a dinghy. The mast length would be 10.5 feet tall to accommodate a 20-22 sq ft sail, but for transportation purpose would need to be collapsible into at least two pieces.
I have to decide between a tapered mast or one single diameter. If tapered, I would insert 0.75" OD aluminum into the 0.875 which will have a 0.875 - 2 x(0.058 wall) = 0.759 ID (maybe too tight of a fit and difficult to (dis)assemble?
Using 6061 aluminum, I have a few options:
- a two-piece tapered mast with 0.875 OD and 0.75 OD tubes (wall=0.058" for both)
- a two-piece, non-tapered mast 0.875 OD, 0.058 wall using a 0.75 OD ferrule/connector tube that I would secure on one side with pop rivet.
- a 3 piece, mast using the same method as above
- or 4 sections?
Which mast construction would offer the best strength without causing a permanent bend? How long do the overlaps need to be when using connector tube? Would 0.058 wall thickness be strong enough?
***NOTE: I tried to calculate wind pressure on the sail using F= A x P x Cd and P=0.00256 x v^2 F (in lbs), A (sail area in sq/ft), Cd (Drag coefficient: I used 0.8 and 1.2)