[NSRCA-discussion] Futaba BLS173SV centering problem

Tue Feb 14 12:48:49 AKST 2017


Sent from my iPad

> On Feb 14, 2017, at 09:38, Keith Hoard via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
> Welcome to pattern, Daniel.
>  
> -Keith Hoard
> -klhoard at outlook.com
>  
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Whodaddy Whodaddy via NSRCA-discussion
> Sent: Tuesday, February 14, 2017 04:23
> To: Daniel Underkofler <underdw at gmail.com>; General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Subject: Re: [NSRCA-discussion] Futaba BLS173SV centering problem
>  
> U get wat u pay for.. Quality cost$ in most cases in life and in the hobby
>  
>  
> G
> 
> Sent from my iPhone
> 
> On Feb 13, 2017, at 8:10 PM, Daniel Underkofler via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
> Thanks ??? guys:
> I ask about centering and it costs me $300 replace with adequate servos!  LOL
> Seriously, appreciate the advice.
> Dan
>  
> On Mon, Feb 13, 2017 at 6:35 PM, David Harmon via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> I had a serious problem with aluminum arms on certain JR servos…..the bag works very well.
> Just hold a piece over the spline and press down on the arm….fixed.
>  
> David Harmon
> Sperry, OK
>  
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Gayer via NSRCA-discussion
> Sent: Monday, February 13, 2017 1:57 PM
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Subject: Re: [NSRCA-discussion] Futaba BLS173SV centering problem
>  
> Take a small piece of a plastic bag and sandwich it between the splines and the output arm. That will reduce/eliminate the slop. Some plastic arms don't fit right either.
> 
> On 2/13/2017 12:43 PM, Earl Haury via NSRCA-discussion wrote:
> Dan
> ï¿½
> I find that 0.13 dead band works well. Gear wear isnï¿½t usually a problem with the 173, the Futaba aluminum arms donï¿½t fit the splines tightly though ï¿½ you might check this if using these arms. Lots of folks use the 173 on bipe ailerons (which tend to be smaller). Some time ago I measured servo current draw on each surface and ailerons were by far the highest ï¿½ as Peter notes, big surface. At 7.5v they might be OK, I use the BLS171 which has 60 or so more oz-in torque. Iï¿½ve also found that servos slow a fair bit whenever current draw exceeds 60% of stall current ï¿½ another reason to err on the high side.
> ï¿½
> Earl
> ï¿½
> From: Daniel Underkofler via NSRCA-discussion
> Sent: Monday, February 13, 2017 11:58 AM
> To: NSRCA
> Subject: [NSRCA-discussion] Futaba BLS173SV centering problem
> ï¿½
> Guys,
> I'm new to Futaba programable servos.ï¿½ Have new BLS173SV on ailerons and have a bit of "slop" in the servo output.ï¿½ I'm confident that the majority of the slop is in the servo, not the linkage.ï¿½
> ï¿½
> Should I need to replace gears after only a couple hundred flights?ï¿½ Hard to tell, but seems like there is too much slop with power off, so adjusting settings may not be the answer.ï¿½ Can't find the gearset on Futaba or Tower website anyway.ï¿½ Anybody know the part number and how/where to order?
> ï¿½
> I was going to try reducing the deadband from .36 to .20.
> Recommendations on programable parameter settings improve centering?
> ï¿½
> Thanks,ï¿½ Dan
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