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Old Sep 13, 2015, 02:29 AM
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Careful!
Tower Pro Servo

Several months ago I test flew a new model with a pair of Tower Pro 996 R on the head .Well the model flew ...BUT.. was untrimable for roll and pitch and I was unable to find a sweet spot ..and was fighting with the model all the flight. landed the model and put it away for a long time.
I lost interest with the model and did not bother trying to find the problem.
Only after removing all the electrics from the model did I notice the problem with the head servos. I purchased four of these servos at the one time and found them all to have this dead spot.
Over the years I'm pretty sure that I have seen these servos used on several autogyros from contributors to this group.........so any idea ??
or are this just crap servos.......I would usually us the Blue Bird 620 MG for this application and have never had any prob's with these.
I have also used the Tower Pro 90 and 90S on smaller models finding them an OK servo.
Happy Landings
Chris...




Tower Pro Servo Test (1 min 46 sec)
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Old Sep 13, 2015, 03:16 AM
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Hi Chris, I only use the tower pro mg 946 or 996s on all my larger models. They seem ok but a a budget servo I guess we all get what we pay for and it would not surprise me if mine are not accurate too. Venturing seems vague on several of mine but as I'm always waggling the stick I don't notice as much - or it could be the distraction of my knees knocking !!

I use the mg90s on the smaller and had a couple not work, again these are even more readily on line and I think they're are several bad copies

The only other is the corona on you recommended and I find that a great powerful cheap servo

So I think it is the usual story if it matters I buy better servos but the 946s and 996s have a place and I am happy to continue using- my Ducati Revolver has 2...
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Old Sep 13, 2015, 11:34 PM
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Yes Steve...you only get what you pay for....that's ...if your lucky. Only after posting this video on youtube did I find others showing a similar problem...and I now believe that they are better suited to the stearing of a large buggy. I am going to stick with the Blue Bird 620 MG's from now on.
Re that corona servo......you now know that the arms are not the best fit.....but the red metal ones in my video fit real good.
Now looks like I sell some servos on ebay
Chris...
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Old Sep 14, 2015, 02:26 AM
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Sounds like a plan . If the others give a better feel of the model in the air then a good choice. Will look and see if we can get them too..

Yep found then on HK site so will order some and give them a go - thanks for the tip off Chris

Steve
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Old Sep 14, 2015, 05:01 PM
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Hi Chris

I have found that standard servo arms sold for the Tower pro MG16R are a perfect fit on the Coronas that you use. The ones they come with are just too loose.

Graham
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Old Sep 14, 2015, 10:56 PM
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The good thing about the metal arms is that they can be tightened with a couple of grub screws but I'm sure there are other arms that will fit OK ...it's just that the supplied ones are of a very poor quality.
Chris...
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Old Sep 15, 2015, 01:03 AM
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A couple of the 620 msg on order..

Will set up the test like you and repeat to see if my Mg 996s are poor

Steve
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Old Sep 15, 2015, 05:06 AM
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good thinking....
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Old Sep 15, 2015, 01:10 PM
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Hi Graham

Struggling to find a potential source for the MG16 servo arms for my corona servos, any ideas?? Tried A net search....

Steve
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Old Sep 15, 2015, 05:14 PM
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Hi steve

Servo shop ( Steve Webb for the MG16r servo arms

link here

http://www.servoshop.co.uk/index.php...RM&area=SPARES

Graham
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Old Sep 16, 2015, 01:19 AM
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Thanks Graham, ordered

Steve
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Old Sep 19, 2015, 08:06 AM
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So they have arrived, looks like a sturdy unit with stiff horns. Will wire up and test against the 996s
Steve
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Old Sep 21, 2015, 12:49 AM
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So two tests completed.. interesting results..

Servo test 1 (1 min 4 sec)


Servo test 2 (0 min 36 sec)
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Old Sep 21, 2015, 05:01 AM
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Steve Good test .. The servo delay on my model made it just about untrimable.
I believe that the 996 has replaced the 995..... because the 995 was known to catch on fire account of a poor circuit board...and there examples of it on youtube.
But I'm sure you will see that the Blue Bird is a pretty sturdy bit of kit . I think that I have about 20 of them. Thanks for following up with you test.
Chris...
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Old Sep 21, 2015, 06:13 AM
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Yep interesting . The Blue Bird servos are about 12 compared with about 9 for the Tower Pro.
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