REFLECTOR: Interesting Angles -- Fuel Venting & Prop Strike

[Bob Jackson (Jax Tech)]

Brian,

 

Your 19 deg climb out angle is correct (according to our GRT EFIS data
dumps) for a 100 KIAS climb.  For a more normal 120 KIAS climb, the angle is
about 13 degrees.  Our typical extended climb is at 160 KIAS (to help with
cooling), and it is about a 7 degree climb angle.

 

Why do you want to climb out at 19 degrees, Brian?  Unless you're unusual, I
think you're going to have cooling problems at that attitude, especially for
extended climbs (to 10 Kft or above).  For first flight, you will also
probably only have ~1/4 fuel, so you should be able to climb out at almost
any angle you want without venting fuel.

 

Bob

 

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From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Brian Michalk
Sent: Sunday, November 27, 2011 9:48 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Interesting Angles -- Fuel Venting & Prop Strike

 

How timely!

I am trying to figure out how to do some full power runs with the airplane
at 19 degrees.

I'm SE/FG with Franklin/IVO.  At 10 deg, the prop touches the floor.  To get
to 20 deg, I need to raise the wheels 23 inches, plus a bit for safety.

Why 19 degrees?  That's what I calculated to be my climbout on first flight.
Yesterday, I also added a vent loop that goes up along the ceiling.

On 11/27/2011 08:18 PM, Bob Jackson wrote: 

A little while back we were talking about how fuel is vented from the
Velocity in steep climb angles when the fuel in the front part of the strake
tank is higher than the vent loop normally routed to the top of the inside
of the engine bulkhead  I'm interested in this because we periodically do
smell a little fuel in the cockpit, and I think we are smelling wisps of the
vented fuel, coming back in the main gear leg holes.

 

 

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