bob turner
Well-Known Member
- Joined
- Jan 7, 2005
- Messages
- 17,057
- Reaction score
- 4,801
We sort of hijacked a clip wing thread. I propose going over all this stuff in a new thread dedicated to takeoff rolls in Cubs.
To start it off, I note that a Cub is almost 23 feet long, so you need at least that many feet to get airborne.
I also note that we have a displaced threshold, with imbedded approach lights and various other markings that repeat every 200 feet. I can get takeoff roll data very accurately. I average between 175 and 220 feet of main mount movement, depending on the wind snd my weight.
Today I was paying attention in my 180 HP constant speed prop Decathlon - I use five seconds for a push from idle to full power, and it took those five seconds to get to the 250 foot mark. The climb rate was 1200 fpm, after a 600 foot ground roll.
As noted in the clip wing thread, I have done some pretty extensive testing, and can see no difference between tail high and tail low takeoffs in terms of distance - except when I inherit students, who are invariably taught to raise the tail on takeoff. They always hold it on the ground well past rotate speed. You can hear me say "it'll fly!" And my hand giving the levitate signal.
So now, if you wish to participate, how about some numbers from other Cub pilots? Mention whether it is just main wheel roll distance or whether you include the length of your aircraft?
To start it off, I note that a Cub is almost 23 feet long, so you need at least that many feet to get airborne.
I also note that we have a displaced threshold, with imbedded approach lights and various other markings that repeat every 200 feet. I can get takeoff roll data very accurately. I average between 175 and 220 feet of main mount movement, depending on the wind snd my weight.
Today I was paying attention in my 180 HP constant speed prop Decathlon - I use five seconds for a push from idle to full power, and it took those five seconds to get to the 250 foot mark. The climb rate was 1200 fpm, after a 600 foot ground roll.
As noted in the clip wing thread, I have done some pretty extensive testing, and can see no difference between tail high and tail low takeoffs in terms of distance - except when I inherit students, who are invariably taught to raise the tail on takeoff. They always hold it on the ground well past rotate speed. You can hear me say "it'll fly!" And my hand giving the levitate signal.
So now, if you wish to participate, how about some numbers from other Cub pilots? Mention whether it is just main wheel roll distance or whether you include the length of your aircraft?
