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11-12-2019 12:57 AM  30 days ago
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Infarcted

rrApprentice

downunder

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Old pot radio
I know it 's an anti-climax for most, but I have in possession a Vintage Gold Futaba heli pot radio which works fine and beautiful to look at . I plan to use it in an old Hirobo Shuttle just for the sake of it. I 'm just wondering for those who know, how does one set servo arms neutral since there's no sub trim , only trim on the sticks , esp for say aileron or elevator? How did people do it in the old days ? Thanks for any advice .
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11-12-2019 01:06 AM  30 days ago
Jerry K

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Houston Area

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Futaba had a rather innovative servo arm. The numbers represent 'clocking' and each number clocks at a different position. To if it has 6 arms try each number until you find the one that fits the best. JR has different molds for the arms but you have to use trial and error method then I mark them A B or C. if I know a didn't fit my needs I would got to B or C. they just were not smart enough to put the numbers on them.
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11-12-2019 01:11 AM  30 days ago
Infarcted

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downunder

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Thanks for the reply. Unfortunately I am running Hitec servos and and flipping the arms 180 degs still doesn't get it level for my needs.
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11-12-2019 01:56 AM  30 days ago
JuanRodriguez

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The Villages, Florida

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Infarcted Thanks for the reply. Unfortunately I am running Hitec servos and and flipping the arms 180 degs still doesn't get it level for my needs.
Just get it as close as you can and go with it ...: don’t overthink it !!
Been there, done that and old enough to know better.....
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11-12-2019 08:44 PM  30 days ago
CrackSmacklePop

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San Diego, CA Sun, Sand and 3D!

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Move the trim tabs on the sticks to get the servo horn aligned. If you can't get it aligned without being just a few clicks one way or the other from center (not fully maxed out on the trim tabs), then you can get different servo horns to see which one will allow to be centered while still allowing some wiggle room on the trim tab....or you can just wing it as described above.
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11-13-2019 02:18 AM  29 days ago
helitom

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Pine Grove, Calif, USA

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Put the transmitter trims at zero-zero. Install the servo arm as close as possible to the 90 degree position. Adjust the control rod to zero the position of which ever function you are working with. Go fly.

If you really want to get picky, install a circular output arm and drill it to install a control ball at the exact 90 degree position. Go fly.

To even get more picky, look around for some Futaba servos from that generation (I can't remember what they were s-28's or maybe s148's). Those will definitely have output arms that will be at 90 degrees with zero-zero trim settings. Go fly.

As best I can remember my Shuttles flew as good as I knew how to fly at the time with a wide variety of radio parts installed. I just kept tweaking clevis or ball links until the transmitter was at zero-zero trim.
The older I get, the fewer things seem worth waiting in line for.
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11-16-2019 06:11 PM  26 days ago
flyin dan

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Beloit Wi.

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Make sure all the rotating ball bearings are in new condition. Bad, notchy bearings will create RF signal noise, causing glitching with FM receivers.
I experienced this with Futaba fm radios when running my X-Cell 60.
AMA # 943111
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11-16-2019 10:12 PM  26 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Infarcted I plan to use it in an old Hirobo Shuttle just for the sake of it.
/
/

Your hirobo shuttle is a vintage heli, of course... But... Planning to fly this beauty with a vintage radio, no way...

It is not a good idea.
A vintage futaba like T5NLH could be...

For that vintage radio you said, look for some Kind of plane with two or three channels...

/
Saludos cordiales,
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11-16-2019 10:32 PM  25 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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Infarcted How did people do it in the old days ? Thanks for any advice .
/
/

For example, your hirobo shuttle use pushrod similar to airplane, I mean, on thread rod It used "Z" pushrod in one end and ball link at the other end.

As you can see, the subtrim is doing by operating the ball link on each pushrod.

This kind of "Z" pushrod are very slopy thing... Waste of time.

I recomend, eliminate all "Z" pushrod, converting to ball link and forget about using vintage radio.

/
Saludos cordiales,
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11-21-2019 12:20 AM  21 days ago
flyin dan

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Beloit Wi.

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Great advice, used 2.4 radios are all over, for good prices. If you must use it, have it checked out by someone that repairs these radios. Cheers!AMA # 943111
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11-21-2019 07:09 AM  21 days ago
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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In general, if you loosen the stick's pot in the gimbal frame, you can rotate the pot a couple of degrees +/-.
That will center the servo.
Do that with the trim lever at its center position.
+ > ÷
Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!
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11-22-2019 01:28 AM  20 days ago
Inspector Fuzz

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NLA

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The same is true for the servo, but harder to do, since smaller.
The servo pot is adjustable as well, like the transmitter. In the old days before reverse switches on radios it was common to reverse the wires on the servo pot to reverse direction. Futaba also made "L" servos that were reverse direction.
My second radio was a Futaba Gold Box. First was a Heathkit (Kraft).
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