VAPP and VREF for the Dukes

[brennan]

Looked in the manuals but can't spot the correct landing speeds to use in each of them. I'm landing fine keeping above the red line but am curious what the recommended profile is for each.

[Ballinger France]

With most light twins, flying the 'Blue Line' on the ASI on final keeps you at your best single engine rate of climb speed in case of engine failure at that critical phase of flight. This is critical with aircraft like the Piston Duke because loss of one engine can result in an 80 percent loss of climb rate.

The Turbine Duke is a rocket by comparison, and maintaining the blue line on the ASI on approach isn't near as critical due to the huge performance increase with the jet powered props, so it's really a matter of pilot preference. You can maintain the blue line (120kts indicated) on approach for maximum safety and single engine climb performance if needed, then gradually slow the aircraft to a few knots above the Red Line airspeed (Vmc minimum single engine control speed) just as you cross the runway threshold. Once landing is assured, the Red Line speed no longer needs to be maintained.

[brennan]

Thank you - very clear.

[Avionic]

@brennan
Just noticed this over on the copilots side of the turbine duke and thought about your post:

Gives recommended approach speed (though twice and with 2 kts between?) of just above red line.

[brennan]

@Avionic lol thanks.... so busy looking out front :-)

[Black Square]

It's amazing how some of these things can escape me for the hours I spend looking at them... Those are supposed to be two different numbers for the piston version and turbine version, and the bottom number is supposed to be the maximum demonstrated crosswind component. Fixed now. Thanks for pointing it out.