sjohnson
FRIEND
Boise, ID
I was talking to a couple of friends the other day. One just sold his Carbon Cub and wants to buy a 182 for doing cross countries. The discussion got around to the King Katmai conversion by Peterson.
Peterson advertises the stall speed as 31k at 3100 lbs. The original stall speed for a 182Q is 50 KCAS (dirty, power off, most rearward CG) at 2950 lbs.
31 kts is 62% of the original stall speed, or about 38% kinetic energy. This doesn't seem aerodynamically possible without lengthening the wings, which I understand is not part of the conversion. There simply isn't enough energy in the airflow.
Micro shows a 8% reduction in stall speed for its VGs. The Katmai canard might help a little, but it cannot be too powerful - if it overwhelms the tail, it could induce a deep stall.
So how is this possible? Is the 31k number power on? KIAS instead of KCAS?
Flight reviews (from the Peterson website) describe touchdown speeds ~35k, presumably indicated but not at gross.
Landing roll goes from 560' to 290', which also seems suspect. Even at the published stall speed, given the energy change (assuming touchdown speed scales), the ground roll should be around 350'.
The Peterson published numbers are roughly equivalent to stock Super Cubs, a plane with much lower power loading and just over half the weight.
Anyone have experience with these?
Peterson advertises the stall speed as 31k at 3100 lbs. The original stall speed for a 182Q is 50 KCAS (dirty, power off, most rearward CG) at 2950 lbs.
31 kts is 62% of the original stall speed, or about 38% kinetic energy. This doesn't seem aerodynamically possible without lengthening the wings, which I understand is not part of the conversion. There simply isn't enough energy in the airflow.
Micro shows a 8% reduction in stall speed for its VGs. The Katmai canard might help a little, but it cannot be too powerful - if it overwhelms the tail, it could induce a deep stall.
So how is this possible? Is the 31k number power on? KIAS instead of KCAS?
Flight reviews (from the Peterson website) describe touchdown speeds ~35k, presumably indicated but not at gross.
Landing roll goes from 560' to 290', which also seems suspect. Even at the published stall speed, given the energy change (assuming touchdown speed scales), the ground roll should be around 350'.
The Peterson published numbers are roughly equivalent to stock Super Cubs, a plane with much lower power loading and just over half the weight.
Anyone have experience with these?