[NSRCA-discussion] Digital and analog servos on sport plane

Fri Mar 27 08:46:10 AKDT 2020

That’s good but you also need to make sure that the battery is capable of delivering a substantial amount of instantaneous current i.e. it has low internal resistance or it is large enough (capacity-wise) to prevent it from discharging at a high-C rate. This is especially important if you’re using a 2.4GHz Rx. If the receiver voltage gets too low, even for a short period of time it may become unlinked from the Tx. Some receivers take a while to link again and that could cost you an airplane.

Bottom line: If you’re at all unsure about the battery, invest in a new one that has enough nuts to handle the digital servos.

John Pavlick

Cell: 203-417-4971

Integrated Development Services

From: chuenkan at comcast.net <chuenkan at comcast.net> 
Sent: Friday, March 27, 2020 9:52 AM
To: John Pavlick <jpavlick at idseng.com>; General pattern discussion <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] Digital and analog servos on sport plane

Right you are, John.  I forgot that little detail.  I always use 6-volt Rx packs, anyway, so as long as I monitor pack capacity during a long flying day, current draw is not a problem. 

Phil Spelt, AMA 1294, Scientific Leader Member
SPA L-18, Board Member, NSRCA 2032, KCRC Emeritus
Knoxville, TN  37931   (865) 604-0541c

On March 27, 2020 at 8:51 AM John Pavlick via NSRCA-discussion <nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org> > wrote: 

Mike,

Make sure that your airborne batteries or the BEC in your speed controller are capable of delivering sufficient current. Digital servos can draw a lot more current than analog servos!

John Pavlick

Cell: 203-417-4971

Integrated Development Services

From: NSRCA-discussion <nsrca-discussion-bounces at lists.nsrca.org <mailto:nsrca-discussion-bounces at lists.nsrca.org> > On Behalf Of Phil Spelt via NSRCA-discussion
Sent: Thursday, March 26, 2020 6:36 PM
To: Michael Cohen <precisionaero at hotmail.com <mailto:precisionaero at hotmail.com> >; General pattern discussion <nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org> >
Subject: Re: [NSRCA-discussion] Digital and analog servos on sport plane

Hey, Mike, 

I don't know about Airtronics, but the Spektrum radios I fly (DX-9 and iX12) are capable of two frame rates -- 22 msc and 11 msc.  In order to use the faster frame rate, you need all digital servos, as the analog can't follow the faster frame rate.  If  your Tx works the current analog servos, I don't think you will find any electronic issues, as the digital servos are equally capable of following the slower frame rate.  The pulse widths and voltage changes to create the pulses are well-standardized, these days.  Whether you would experience any "flying feeling" differences between functions with and without digital servos, I don't know. 

What functions are you ging to use digital servos for, and why?  Just curious... 

Phil Spelt, AMA 1294, Scientific Leader Member

SPA L-18, Board Member, NSRCA 2032, KCRC Emeritus
Knoxville, TN  37931   (865) 604-0541c

On March 26, 2020 at 6:23 PM Michael Cohen via NSRCA-discussion <nsrca-discussion at lists.nsrca.org <mailto:nsrca-discussion at lists.nsrca.org> > wrote:

Hope everyone out there is COVID-19 free and using this time to build or fly, with social separation, if the weather is nice enough.

I have a sport plane where I want to put a digital servo in with the inexpensive analog ones the plane came with.  Any know issues with such a setup?  This will be with an Airtronics radio, if that makes a difference. 

Be safe!

Mike Cohen

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>  for Windows 10

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