Servo question
John Ferrell
johnferrell at earthlink.net
Fri Aug 1 07:33:06 AKDT 2003
I discovered a long ways back it is much better for my self esteem count the number of places from the bottom! Except, of course, when I am first!
John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
johnferrell at earthlink.net
Dixie Competition Products
NSRCA 479 AMA 4190 W8CCW
"My Competition is Not My Enemy"
----- Original Message -----
From: Gray E Fowler
To: discussion at nsrca.org
Sent: Friday, August 01, 2003 9:07 AM
Subject: RE: Servo question
Glen
I have never been able to really reproduce that coreless feel, yet with more control due to digitals. I added more expo but all surfaces around center are still more active. I rarely under roll, always over roll. Are you saying that if I reduce the travel of the servo, yet keep the same surface deflection that it gets more controllable? If this is the case I should easily be able to move up from 22nd place to 21st...
Gray Fowler
Principal Chemical Engineer
Composites Engineering
Glen.Watson at aspentech.com
Sent by: discussion-request at nsrca.org
07/31/2003 03:59 PM
Please respond to discussion
To: discussion at nsrca.org
cc:
Subject: RE: Servo question
Early this season I swapped my Futaba 9102 coreless wing servos for 9150 digitals. As Gray mentions I first added more expo to reestablish feel. With this added expo (mushiness) when doing points and slow rolls it was difficult to maintain a consistent roll rate. By decreasing travel volume (9ZAP AFR) in addition to reducing relative expo, roll rate became more controllable and predictable. I sense there is a relative amount of travel volume + expo needed to overcome surface blow back with non-digitals to achieve desired mushiness.
Switching to digital wing servos has greatly changed the rolling characteristics for me in a positive way. Rolls are crisper, more predictable in all air speeds and stop-start with more authority.
Glen
-----Original Message-----
From: Gray E Fowler [mailto:gfowler at raytheon.com]
Sent: Thursday, July 31, 2003 3:04 PM
To: discussion at nsrca.org
Subject: Re: Servo question
What I noticed when switching to digitals was the need to add more exponential. The coreless had a built in mushiness around center. Now I program in the amount of mushiness I want. This probably means that once you get used to a certain mushiness you would fly as well with or with digitals.
Gray Fowler
Principal Chemical Engineer
Composites Engineering
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