Bubble Dancer elevator trims

[neonbutterfly]

A ? for Mark Drela......u mentioned that u use ur slider for the launch trim and thermal trim......i have set up my 9C so i can accomodate this.......what percentage of up elev and down elev are setting the slider to??


thanks bob :confused:

[mlachow]

You can't give a percentage when you don't know the total travel you have set.

And for launch trim, that will depend on the towhook location.

You might find better answers in Allegro-Lite Yahoo Groups

[markdrela]

What mlachow said.

Also, the appropriate slider gain completely depends on the CG position. A far forward CG requires lots of elevator trim (and hence large slider gain) to change trimmed airspeed. An aft CG requires very small gain.

So you will have to determine the slider gain for yourself, via trial and error. But it's essential that you first set the CG location to what you like.

[dr.E]

Boy.... That sounds and smells like Verborhea to me :p

I understood Bob's question and its cryptic-zen like answer....

Maybe we can rephrase the question in this manner....... Bob has built a model of the Alegro Lite and to the best of his knowledge and ability (barring any Beer related incidents) has followed the building protocol of its designer... If he has built it to spec. then it would be safe to assume that the flight parameters of designer's model (e.g. cg and tow hook)would apply to Bob's model..

So the simple question would be, what is your cg set at and what are the throws and mixing prefferences to use as a refference

[solo6796]

ooooooo.....

Subscribed..

[Ollie]

When a symphony orchestra prepares to perform, just before the performance, it tunes up. This is so the various instruments can harmonize with each other to produce beautiful music.

A pilot, plane, launching device and radio are a system where the parts have to be adjusted to each other in a harmonious way to make beautiful flights. When the parts are not adjusted to each other, do we blame the parts or the adjustor? Often two people will have differing opinions about a particular design of plane because they attribute the differences to the design rather than to differences in the way the otherwise identical planes were adjusted to match the systems they were being flown in.

There is a wrong headed point of view that is running rampant. It is that the way a plane flies is entirely due to the design and to the manufacture. I think of this as the "appliance" mentality. It appeals to a lot of people who only buy ARF's and who expect the plane to perform properly when assembled according to the instructions without any further effort on the part of the owner. These people have generally not informed themselves of the affects of various adjustments. This approach can only result in a relatively safe but mediocre performance.

For best results the CG location has to be adjusted to the pilot's ability and flying style. The decalage has to be adjusted to the CG location and to the pilot's skill and flying style. The tow hook location has to be adjusted to the pilots skill, the launch technique and launch equipment. The control throws have to be adjusted to the pilot's flying style. Furthermore the adjustments have to accomodate the flying conditions and the particular purpose of the flight to be made.

See:
http://polecataero.com/articles/cg-location
http://www.charlesriverrc.org/articles/allegrolite2m/markdrela_allegrolite2m.htm
Download PDF plan.
" stab at 0 deg to wing bottom"
" All moving tail +10 deg strong expo -8 deg mix in with full spoiler"

Dr. Drela has better plans and instructions than any! Read them!

[dr.E]

[QUOTE=Ollie]When a symphony orchestra prepares to perform, just before the performance, it tunes up. This is so the various instruments can harmonize with each other to produce beautiful music.

QUOTE]

Point well taken... But the orchestral instruments will tune to a refference tone say "B flat" usually played by the clarinette or piano. All instruments tune to refference...

Just because the Tuba tuned to a note(actually a note is written and tone is its expression) of the clarinette does not make it a clarinette. It uses it as the refference standard and starting point from which every instrument in the orchestra adheres to...

So our Tuba player (Bob) is carefully listening to his refference B flat note (which the conductor has deemed as the standard) so that he can harmonize with the rest ......

[RobZ]

If only metaphors could fly. :)
Rob.

[dr.E]

If only metaphors could fly. :)
Rob.

That in itself captures the true essence of *Brick