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A successful hull with any fully surfacing drive will need natural rocker in the bottom. Otherwise, the thrust line is too high. That makes the boat roll up toward its nose and bow steer. Unfortunately, a 20 Cig bottom is very straight and true. Not good for a surfacing drive - unless you are able to lower with spacers (not possible on an Arneson).
Rocker's why a Donzi 32 ran great with Blackhawks. My old Scarab with a single Blackhawk was almost impossible drive at speed due to bow steer. It was +- 30 degrees of heading every time it landed after a launch - because the nose did the steering. Same was true of the few they built with KAAMAs back in the 1980's. Furthermore, as a single, your Cig will tend to torque roll opposite the direction of prop rotation. (At least Blackhawk, with counter rotating props, didn't have that problem.) You would need constant tab to offset. At the power you're talking about, your easiest and cheapest solution to your drive dilemma is to leave the Arneson on the floor and buy a Bravo XR. Drive trim is your friend. My 2 cents. |
Faster - I'm guessing your referring to the 22' Blackhawks, not a 32.
Off topic but I've ridden in a couple of Blackhawk boats and they scare the crap out of me. Granted the first one I was in the guy had just bought, was trying to learn how to drive it and we were dodging logs all through Lake Cumberland |
Originally Posted by FasterFaster
(Post 3663881)
A successful hull with any fully surfacing drive will need natural rocker in the bottom. Otherwise, the thrust line is too high. That makes the boat roll up toward its nose and bow steer. Unfortunately, a 20 Cig bottom is very straight and true. Not good for a surfacing drive - unless you are able to lower with spacers (not possible on an Arneson).
Rocker's why a Donzi 32 ran great with Blackhawks. My old Scarab with a single Blackhawk was almost impossible drive at speed due to bow steer. It was +- 30 degrees of heading every time it landed after a launch - because the nose did the steering. Same was true of the few they built with KAAMAs back in the 1980's. Furthermore, as a single, your Cig will tend to torque roll opposite the direction of prop rotation. (At least Blackhawk, with counter rotating props, didn't have that problem.) You would need constant tab to offset. At the power you're talking about, your easiest and cheapest solution to your drive dilemma is to leave the Arneson on the floor and buy a Bravo XR. Drive trim is your friend. My 2 cents. |
fixx
Originally Posted by FasterFaster
(Post 3663881)
A successful hull with any fully surfacing drive will need natural rocker in the bottom. Otherwise, the thrust line is too high. That makes the boat roll up toward its nose and bow steer. Unfortunately, a 20 Cig bottom is very straight and true. Not good for a surfacing drive - unless you are able to lower with spacers (not possible on an Arneson).
Rocker's why a Donzi 32 ran great with Blackhawks. My old Scarab with a single Blackhawk was almost impossible drive at speed due to bow steer. It was +- 30 degrees of heading every time it landed after a launch - because the nose did the steering. Same was true of the few they built with KAAMAs back in the 1980's. Furthermore, as a single, your Cig will tend to torque roll opposite the direction of prop rotation. (At least Blackhawk, with counter rotating props, didn't have that problem.) You would need constant tab to offset. At the power you're talking about, your easiest and cheapest solution to your drive dilemma is to leave the Arneson on the floor and buy a Bravo XR. Drive trim is your friend. My 2 cents. |
Originally Posted by offshoredrillin
(Post 3664157)
huh? every person that has put a blackhawk on a cig 20 has picked up speed and driveability. I have one for my 20 cig. Cig 20's have plenty of rocker built into them. Tony, go by Daves shop, he is finishing up mine as we speak.
I wish I could still run mine. Too bad there isn't an SCX version :) |
Originally Posted by offshoredrillin
(Post 3664157)
huh? every person that has put a blackhawk on a cig 20 has picked up speed and driveability. I have one for my 20 cig. Cig 20's have plenty of rocker built into them. Tony, go by Daves shop, he is finishing up mine as we speak.
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Some of the newer 20's built do have a pad bottom, but have still responded well to the Blackhawk, the round keel ones will respond even better.
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