REFLECTOR: Take Off Performance
Ron Brown
romott at adelphia.net
Sun Apr 9 13:07:11 CDT 2006
I would suggest that the pusher is the problem. With the Cirrus, you have prop blast washing over the wings and tail, improving low speed lift.
Our Velocities are depending purely on aircraft speed for lifting air.
Although the SR22 is a sexy plane, the Velocity draws the bigger crowds with the most questions.
But, I love them both!!!
----- Original Message -----
From: Tom Martino
To: Velocity Aircraft Owners and Builders list
Sent: Sunday, April 09, 2006 12:23 PM
Subject: RE: REFLECTOR: Take Off Performance
When I first looked into Velocities, I realized that a 200 Horsepower Velocity is a two-place plane at best. That is why I went with a IO-540 (generating 310 hsp) on a 173RG Elite. If the truth be told . I still don't think it is an adequate 4 place.
When I compare the canard to my other plane - A SR22 Cirrus (also 310 horsepower) - you soon realize that the Velocity is a ground-lover.
My field is at 5500 ft and I have a four-blade MT prop.
The Cirrus is much heavier . but jumps off the ground compared to the Velocity.
Once flying . the performance is about equal.
Is it the canard that makes it sluggish on take-off? That's the only tin I can surmise.
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of NMFlyer1 at aol.com
Sent: Sunday, April 09, 2006 9:11 AM
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Take Off Performance
When I went to the last Texas Velocity event in TKI, I was amazed at how much runway Velocities took to get off the ground. It wasn't very hot that weekend, and the field elevation was much lower than here in New Mexico. That weekend was an eye opener for me, and caused me to go with my current engine choice (340 HP 4.3L, Aluminum V-6 Chevy).
Since my field elevation is 4800 MSL, density altitude (DA) is always a concern. On a summer day out here, about 25% of your horsepower is gone, just to DA, and that doesn't include the effects on prop and wings. If had put a 200 HP IO-360 in my 173, I would be trying to take off from a 4300' runway, in a canard, with 150HP (on a good day) high and hot,... NOT a good idea... just ask Scott... he's been in here a couple times. Notice he is changing engines in his V also.
So my plan for high DA takeoffs here has many parts:
More Horsepower!!! That should get me to takeoff speed much faster.
Lots of torque, and a huge 76" 3-blade constant speed prop.
The 173 Wing, for slower T/O & Landing speeds, and better high altitude performance.
I left the Elevator cuffs off. Am putting the VG's on.
I reworked the rudders. I have about 2.5" deflection before the brakes touch.. and over 5.5" total rudder travel. That should help on takeoff and reduce brake use on takeoff & crosswinds.
Wish me luck. I pick up my ceramic coated exhaust tomorrow and finish up the engine monitor wiring this week. Pretty close to engine start... finally.
Kurt
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