Re: [Paparazzi-devel] fixed wing angle of attack and cruise speed

[Eduardo lavratti]

Hello Reto, what foil you used in the long range flywing ?
Way this design ? and not a more conventional one ?

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Date: Sat, 23 Nov 2013 21:23:34 +0200
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] fixed wing angle of attack and cruise speed

Hi.

See:

 http://lists.paparazziuav.org/Long-Range-Flying-Wing-td5749.html

http://paparazzi.enac.fr/wiki/File:High_Performance_Flying_Wing.JPG

On 11/23/2013 07:20 PM, Ben Laurie wrote:

On 20 November 2013 08:12, Reto Büttner <address@hidden> wrote:

Hi Chris

 

To optimize efficiency you can display an efficiency indicator on the 2D map using papgets. An easy efficiency indicator would be "Speed per Percent Throttle". Better efficiency indicators are "Speed per Fuel Flow" or "Distance per Litre Fuel", but this needs a fuel flow measurement. For electric planes it would be "Speed per Amps" or "Distance per Ah". The simple math needed for these indicators (one division) can be done directly in the papget. Then choose a calm day (no wind), fly large circles and manually play around with the throttle setting (using pitch neutral as described) until you get maximum efficiency. We have done so successfully with our long distance small electric planes (>125km, 140cm wingspan, 2kg weight).

Cool ... what are these planes?

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