Toffen
06-24-2001, 10:16 AM
Hi!
Summer greetings from Norway.
I added 6,5 inches of setback, new Torque master lower unit and now I have to reconsider my prop choices. Here are the results:
Stock Tempest 25 A45 = top speed 77,8 mph = 6.250 rpms
Blue printed Chopper II 26 inch = top speed 74 mph = 6.200 rpms
DR4 Spinelli 27 = top speed 73 mph = 6.000 rpms
Propshaft height approx. 2,5 inches below the bottom.
Last year with less setback (5,5 inches CMC), best speed was 76 mph with a blue printed Chopper II 26 inch at 6.200 second Raker 24 at 75,5 mph at 6.200 and third Tempest 25 A45 at 74 mph at 6.200. I have not tried the Raker 24 yet.
Crusing speed is 51,5 mph at 4.000 rpms, which is good.
It seems to that the old Tempest has been the prop taking advantage of more setback. Weird that the Chopper II now is slower. The propshaft height is now approx. 2 inches below with all props.
Maybee I should calm down and blue print the Tempest and hope for an additional 1,2 mph = 79 mph. OR do you have any other ideas? What do you think about Mazco HP4 through hub prop? Wery expensive with all these props on the shelf! I may sell some of them cheap...
Specs: phantom 25 with Promax 300. No pad, no notched transom, classic 24 degree V hull. Weight approx. 2.250 lbs.
Cheers, Toffen - Norway
Summer greetings from Norway.
I added 6,5 inches of setback, new Torque master lower unit and now I have to reconsider my prop choices. Here are the results:
Stock Tempest 25 A45 = top speed 77,8 mph = 6.250 rpms
Blue printed Chopper II 26 inch = top speed 74 mph = 6.200 rpms
DR4 Spinelli 27 = top speed 73 mph = 6.000 rpms
Propshaft height approx. 2,5 inches below the bottom.
Last year with less setback (5,5 inches CMC), best speed was 76 mph with a blue printed Chopper II 26 inch at 6.200 second Raker 24 at 75,5 mph at 6.200 and third Tempest 25 A45 at 74 mph at 6.200. I have not tried the Raker 24 yet.
Crusing speed is 51,5 mph at 4.000 rpms, which is good.
It seems to that the old Tempest has been the prop taking advantage of more setback. Weird that the Chopper II now is slower. The propshaft height is now approx. 2 inches below with all props.
Maybee I should calm down and blue print the Tempest and hope for an additional 1,2 mph = 79 mph. OR do you have any other ideas? What do you think about Mazco HP4 through hub prop? Wery expensive with all these props on the shelf! I may sell some of them cheap...
Specs: phantom 25 with Promax 300. No pad, no notched transom, classic 24 degree V hull. Weight approx. 2.250 lbs.
Cheers, Toffen - Norway