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 motor mount thrust line

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madjeff
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PostSubject: motor mount thrust line   Sat Jun 11, 2011 6:22 am

well on the success of my mustang i do have a question for you boffins.
i no 90% of my planes have it but wot does it do.
right thrust wot does it do
down thrust wot does it do. Question scratch
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Keith
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 10:32 am

One takes out the torque roll effect you would get, the other eliminates the plane wanting to climb when you apply more power. guess which is which?

If your plane still climbs when you throttle up jeff what would you do to counter that force?

He he back to school...
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madjeff
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 10:40 am

ha-ha funny lol.
well i would say if the plane is climbing then i need to angle the motor more down and in going faster if it keeps rolling on its axis i need to increase the right thrust i think. study lol.
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 10:42 am

Your spot on m8, its not rocket science jeff we leave that for the wii setups lol
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 10:49 am

so this has me thinking on the axn.when i apply power it drops its nose to the floor , i no this is a pusher and its all reversed but does the motor need to be increased or decreased.or as the pod is hi up and a fer way down the fuzz,there is not much i can do. scratch
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 10:55 am

Yes there is something you can do jeff, Think about it, look at the axn from the side and draw a line through your motor ( use the motor shaft and extend it through the body) if you apply throttle it will push along this line using a downward force.

From your post it appears that your motor angle is a little too low as its pushing the nose down you can pack out the base of the motor with anything you have to hand to get the correct thrust angle.

Its difficult to write it here but i think you get the point?


Last edited by Keith on Sat Jun 11, 2011 11:18 am; edited 1 time in total
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 11:11 am

so my thinking was right,just wonted to confirm i was on the right wave length lol.
thanks for the easy understanding of it all.on the mustang i must of hit it right by the luck of the draw .i just packed it out till i could see it was right and down.if its 1,2 or 3degreess i have no idea lol.
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 5:14 pm

Teaser for you Jeff.

On your Mustang foamy what effect will motor down thrust have
during sustained and level inverted flight ?

pirat
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 6:02 pm

He He nice one Paul
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 6:48 pm

Paul L wrote:
Teaser for you Jeff.

On your Mustang foamy what effect will motor down thrust have
during sustained and level inverted flight ?

pirat
trivia time is it lol.
well i would say nothing.if it flys level right way up and trimmed out well,then inverted should be the same.
can i have the answer on a post card please lol.
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PostSubject: Re: motor mount thrust line   Sat Jun 11, 2011 7:15 pm

You don't sound sure.....

Lets make it an open question
anyone else care to comment ?
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PostSubject: Re: motor mount thrust line   Sun Jun 12, 2011 7:22 pm

No takers ?
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PostSubject: Re: motor mount thrust line   Sun Jun 12, 2011 10:10 pm

I could but I'll wait for others to give there opinions. Laughing
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PostSubject: Re: motor mount thrust line   Sun Jun 12, 2011 10:14 pm

You need to bring the Quad to the field

A few of us are risking the imminent rain
I'll be there around 1PM


Very Happy
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PostSubject: Re: motor mount thrust line   Sun Jun 19, 2011 8:20 am

[quote="Keith"]I could but I'll wait for others to give there opinions. Laughing [/quote]

No others are playing Crying or Very sad

Back to Jeff's question
Down thrust while inverted will have the opposite effect
it's now [b]up thrust [/b]

Basically it will cause More elevator input to be required for inverted flight.
It will also play havoc with Rolls, they will not be axial at all, without Lots of Elevator correction needed by the Pilot.

The main wing Angle of Incidence (AOI) will also play a part in these effects
A Positive AOI as in Jeff's Mustang foamy
will be a Negative AOI when Inverted, therefore to bring the plane level will require more Down elevator to fly.

This is the reason you will see Acro Planes usually are said to be Zero, Zero setting

Zero motor Down thrust
Zero wing Angle Of Attack

It means less elevator correction is needed while inverted
and more axial rolls with less Pilot input.

--------------------------------------

Side thrust compensates for motor Torque
therefore it does not matter whether the aircraft is inverted or upright.
It purely compensates for the Motor Power, once set correctly Upright and Inverted is compensated.


Paul
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