Weight & Bal Calc ASK-21

Anyone have a simple wt. & bal calc method for ASK-21? The manual is all in German and makes no sense. Power-plane manuals are simple to use with a graph.

Perhaps download this manual in English, and look at page 46.
Jim

http://www.williamssoaring.com/fleet/ASK21_manual.pdf

On Saturday, October 24, 2015 at 5:45:49 AM UTC-7, Skytime wrote:
Anyone have a simple wt. & bal calc method for ASK-21? The manual is all in German and makes no sense. Power-plane manuals are simple to use with a graph.

May I shamelessly recommend SeeG, a program specifically designed for C/G calculation on gliders, one seat or two. http://www.glideplan.com/styled-2/page12/index.html Simple, fast, and flexible.

Matt Herron

Essential: Obtain the Schleicher ASK-21 Flight Manual in english.
It will be specific to your serial number.
Note the manual revisions listed at the Schleicher website.
If you attach the spin weights, consult the recent manual revisions.

Optional: A calculator but only for a specific ASK-21 in Nevada: http://soaringnv.com/WeightBalance.php

Best to develop your own. Consult your A&P / IA.

And as a final thought: there's a fairly recent TM which expands the manual
with new weight-ranges for heavier gliders.

If you're comfortable with spreadsheets, make your own or borrow an
existing one and modify it for your glider. My LAK-17a came with a
spreadsheet which I've modified to include installation of a flight
computer in the panel and replacing the tail battery with a heavier lead
weight. It also has cells for wing and tail ballast (water) and is
duplicated for 15- and 18-meter spans and baggage compartment load. I
don't know whether it came from the factory or the previous owner, but
it's pretty simple to make. I did one for the company King Air years back.

On 10/24/2015 11:49 AM, Burt Compton - Marfa Gliders, west Texas wrote:
Essential: Obtain the Schleicher ASK-21 Flight Manual in english.
It will be specific to your serial number.
Note the manual revisions listed at the Schleicher website.
If you attach the spin weights, consult the recent manual revisions.

Optional: A calculator but only for a specific ASK-21 in Nevada: http://soaringnv.com/WeightBalance.php

Best to develop your own. Consult your A&P / IA.


--
Dan, 5J

If you do your own calculations, please be aware of a very common error. Some manuals use a formula for C/G which uses the distance between the main wheel and the tail wheel. Others use a formula that use the distant to the tail wheel from the datum. Either one will work, but if you use the wrong distance to the tail wheel it creates a 3-5% error in the final C/G. It usually goes unnoticed as it is small, but I have seen this even from official W&B sheets.

Matt H

On Sunday, October 25, 2015 at 3:34:21 PM UTC+1, Matt Herron Jr. wrote:
If you do your own calculations, please be aware of a very common error. Some manuals use a formula for C/G which uses the distance between the main wheel and the tail wheel. Others use a formula that use the distant to the tail wheel from the datum. Either one will work, but if you use the wrong distance to the tail wheel it creates a 3-5% error in the final C/G. It usually goes unnoticed as it is small, but I have seen this even from official W&B sheets.

Matt H

And do NOT trust an old and unkown W&B. I have seen to many of them that has been wrong, both in mass and distance and therefore in CG, even the original factory W&B can not be trusted as it sometimes is pre-made prior to finishing of the glider.
Do it your self properly once. Any change in instruments, ballast, trim weights, etc can later on be calculated.

/Per

On Saturday, October 24, 2015 at 10:13:06 AM UTC-5, JS wrote:
Perhaps download this manual in English, and look at page 46.
Jim

http://www.williamssoaring.com/fleet/ASK21_manual.pdf

Thanks.

I found these pages from the manual which are much clearer and, easy to print graph.

http://www.alexander-schleicher.de/w...TM35_US_HB.pdf

On Saturday, October 24, 2015 at 10:29:48 AM UTC-5, Matt Herron Jr. wrote:
On Saturday, October 24, 2015 at 5:45:49 AM UTC-7, Skytime wrote:
Anyone have a simple wt. & bal calc method for ASK-21? The manual is all in German and makes no sense. Power-plane manuals are simple to use with a graph.

May I shamelessly recommend SeeG, a program specifically designed for C/G calculation on gliders, one seat or two. http://www.glideplan.com/styled-2/page12/index.html Simple, fast, and flexible.

Matt Herron

Thanks. I stay with the paper math.

I would rather spend the $80 bucks on paying for a tow.