ACRO E-mail Archive Thread: [Acro] Re: How much vertical in a B?
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Thread: [Acro] Re: How much vertical in a B?
Message: [Acro] Re: How much vertical in a B?
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From: "Andrew Boyd" <aboyd at igs.net>
Date: Sun, 29 Dec 2002 00:04:22 UTC
As Peter mentioned, you need more speed to cap than you need to hammerhead. The number of rolls you can get will be a function of: 1) entry speed - more kinetic energy means more potential energy 2) G in the pull to vertical: too much G will create too much drag. Look at a graph of how Cd takes off with alpha, or as the man says, you can spend it in the lines, or you can spend it in the corners 3) no lengthy pause after setting vertical and starting to roll. This takes practice. 4) density altitude. You'll do a lot better at low elevations and low temps. It was around 0C here today, and I was getting easy 1800 feet vertical in my B. 5) propeller. You'll get better vertical with a wide-chord composite propeller than you will with the metal two-blade because of the superior slow speed thrust. 6) governor setting. Are you really seeing 2700 rpm? If you're not, you're giving away power. 7) engine health. Compressions all in the high 70's? A tired engine will not make the same power as when it was new. 8) weight. Obviously you'll do better solo if you're a light guy with half tanks. If you want lots of showy vertical rolls, you should learn how to torque roll. Roll on the way up, then roll on the way down. The rate of roll markedly increases during the tailslide, and people think it's neat when aircraft are going backwards :-) -- aboyd at igs.net ATP www.pittspecials.com ----- Original Message ----- From: "Jerry Guy" <jguysr at bellsouth.net> To: "IAC List" <acro at gf24.de> Sent: Friday, December 27, 2002 6:18 PM Subject: [Acro] How much vertical in a B? > B drivers, > As an aerobatics novice flying a S2B, I was very happy that I had > worked up 1 1/4 vertical rolls and being able to cap and stagger away. > Now, I'm told (by someone who should know) that 3 rolls vertical (hammer > out) is quite possible. At my level this is nearly incomprehensible! > > So, what I want to know is, what are your experiences? techniques? > > > Vertically challenged, > Jerry >