REFLECTOR: Takeoff roll - fuel burn

[Scott Derrick]

Unless I'm very light, just me and little fuel, I can usually land in
half the distance a take off requires.

Maybe that is because of our high density altitudes.

Scott

Al Gietzen wrote:
>
> A further comment – For me and my plane the limiting factor is landing
> distance, not takeoff roll. While doing these tests I found I had to
> brake fairly hard to make the exit at 2400’. Rolling out over the
> numbers I still carry quite a way in ground effect before the mains touch.
>
> Al
>
> -----Original Message-----
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> *On Behalf Of *Al Gietzen
> *Sent:* Thursday, May 21, 2009 10:47 PM
> *To:* reflector
> *Subject:* REFLECTOR: Takeoff roll - fuel burn
>
> Here’s a bit of data from today’s measurements.
>
> The question came up here awhile back about fuel economy vs CG. I did
> flights today in my SE RG with CG at 120”, total weight about 2060;
> and at 116”, total weight about 2270. The CG was shifted by adding a
> person in the right seat. Surprising; within the accuracy of the
> measurements, both cases were the same: 160 KTAS burning 9.5 gph at
> 2500 rpm on a fixed pitch prop (rotary 20B, lean cruise). At pattern
> speed of about 100 KIAS I noted the heavier, forward CG took more
> power; but I didn’t take any data.
>
> Takeoff roll – 85F; 1400’ field elevation, roughly 8-10kt wind
> component down the runway, fixed pitch cruise prop.
>
> Weight – 2100; CG – 120”; about 1630 ft
>
> Weight – 2300; CG – 120”; about 1730 ft
>
> Weight – 2300; CG – 116”; about 2300 ft
>
> These are all single run measurements, taken by spotting relative to
> taxiway exits and edge lights, and taken from a rolling start –
> rolling on to the runway, getting it straight and adding power. Moving
> the CG forward made a more dramatic difference than adding weight, and
> I didn’t like the way it handled at pattern speed, or landing.
>
> The first case above was repeated using so-called ‘Short field
> takeoff’ procedure – getting lined up near the end of the runway, and
> applying power while holding brakes; then release. Takeoff roll was
> the same as the rolling start. My rotary spools up very quickly when I
> push in the throttle; things may be a bit different with a Lyc.
>
> Al
>
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