curtisscholl
Gold Supporter
Hi:
The KB3 ultralight is a KB2 with a 72 inch mast, still using the 2 x 2 x .125 6061-T6 and could use a 6" drop keel. 7 pounds.
The 3DRV was a drop keel ultralight with a 60 inch mast, using 2 x 2 x .1875 6061-T6 (8.78 pounds) and a 6" drop keel. 72" mast would be 10.5 pounds.
So, I want to increase the mast length of the mast on the 3DRV but decrease the weight.
IF the KB3 2 x 2 x .125 mast was good enough at 72" why would not a change to the mast on the 3DRV be just as good?
Both designs use the same kind of cluster plates, and there might even be a Hornet drop keel integration here.
The Same engine or nearly the same engine was used on all three (503 or 582). I really want to swing a 68" - 72" prop with enough clearance to not worry about slicing through the support for the tall tail.
i could use the double 2 x 1 x .125 for an increase that would put it at 8.78 pounds. 40K pounds of strength, is way more than the 254 pounds the thing would weigh even at 4.5 g....and given the possible lateral challenge, it will still hold up.
Opinions?
Curtis Scholl
The KB3 ultralight is a KB2 with a 72 inch mast, still using the 2 x 2 x .125 6061-T6 and could use a 6" drop keel. 7 pounds.
The 3DRV was a drop keel ultralight with a 60 inch mast, using 2 x 2 x .1875 6061-T6 (8.78 pounds) and a 6" drop keel. 72" mast would be 10.5 pounds.
So, I want to increase the mast length of the mast on the 3DRV but decrease the weight.
IF the KB3 2 x 2 x .125 mast was good enough at 72" why would not a change to the mast on the 3DRV be just as good?
Both designs use the same kind of cluster plates, and there might even be a Hornet drop keel integration here.
The Same engine or nearly the same engine was used on all three (503 or 582). I really want to swing a 68" - 72" prop with enough clearance to not worry about slicing through the support for the tall tail.
i could use the double 2 x 1 x .125 for an increase that would put it at 8.78 pounds. 40K pounds of strength, is way more than the 254 pounds the thing would weigh even at 4.5 g....and given the possible lateral challenge, it will still hold up.
Opinions?
Curtis Scholl