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Need some info - 4/9/2002 6:27:57 AM   
Terror Dactyl



Posts: 392
Joined: 4/9/2002
From: Jurrasic Park, TX,
Status: offline 		Can anybody tell me what would be a good starting point to set the down thrust for a flying wing that I am motorizing (pusher). The bird is a Mongo Sr. (eight foot WS).

Thanks in advance for any info offered. im
       Post #: 1

Thrust line - 4/9/2002 7:22:41 AM   
Ollie


 

Posts: 958
Joined: 12/8/2001
From: Punta Gorda, FL
Status: offline 		If the prop shaft is at the level of the wing chord line, then no up or down thrust will likely be needed. Some left thrust may be needed, depending on how much torque the motor produces. Torque reaction will tend to roll the plane right. If you have a spare mixer, throttle advance can be mixed to a little left aileron control instead of the side thrust.

_____________________________

Regards, Ollie

(in reply to Terror Dactyl)
       Post #: 2

Need some info - 4/10/2002 12:45:13 AM   
MTT



Posts: 562
Joined: 1/18/2002
From: West Chester, OH, USA
Status: offline 		Down / up thrust :

I got this tip on a german RC-forum : Draw a line from the nose of the aircraft to the CG at the wing, this should be your thrust line.
On my Alpina this worked out to approx. 1 deg downthrust.

Michael

(in reply to Terror Dactyl)
       Post #: 3

Thrust line - 4/10/2002 3:01:02 AM   
Ollie


 

Posts: 958
Joined: 12/8/2001
From: Punta Gorda, FL
Status: offline 		Thrust is opposed to drag. In order that the thrust and drag should not form a couple in pitch, the vectors should be colinear. Because the Mongo does not have dihedral, the total drag will be aligned to the root of the wing as should the pusher thrustline. This will also align closely to the CG. You can't go wrong with this setup.

_____________________________

Regards, Ollie

(in reply to Terror Dactyl)
       Post #: 4

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