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HelicopterMain Discussion › Md 800 servo update
03-16-2015 03:46 AM  3 years agoPost 1
Cobra 46

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Cambridge il usa

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After I ruined my servos with 8 volts !!!
So a friend brought over some savox servos for me
But now they are 25 spline . I'm supposed to have them 17 mm for cyclic per instructions !!! and the arms I have are 16 mm or 19 mm can I use Eather one ?

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03-16-2015 05:00 AM  3 years agoPost 2
Fauropitotto

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Tampa, FL

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All you'll get are anecdotes.

In situations like this where you'll get a hundred different answers, I find it's best to set a budget.

If I know that I have a budget of $100 per servo I'll go through the vendors and check the specs of all the servos that max out my budget.

Then once I narrow the list down to maybe 3 or 4, I'll do some searches to find out which servo has the least reported issues.

It's really pointless to ask about this stuff in part due to the "fanboy" group - the guys that buy nothing but one brand, the "just fly" group - the guys that stick with whatever comes with their stock kit and have no interest in anything else so long as it works, and so on...

Here's an important part that slips a lot of discussions like this: Back in the days where flybar was the dominant (and only) system, fast servos were nice, but it was okay to pair the servo with your flying style and skill. The transmitter sent signals directly to the servo which directly controlled the flybar.

Now with flybarless systems, the transmitter is NOT controlling the servos; the FBL unit is. With FBL, the fastest (and with large models, the ones with the most torque) possible servos you can get in there for your budget is always going to work out best.

Not only do you need the high torque for direct-to-swash servo control, but the flight stabilization computer needs the super-speed in order to make the necessary corrections.

One could get away with cheap and slow servos on a flybarred heli, and just adjust the flying style to match...but on an FBL heli, you're flying the computer, and that computer needs fast servos to do what it needs to do.

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03-16-2015 09:58 AM  3 years agoPost 3
Cobra 46

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Cambridge il usa

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Fauropitotto
Never read that befor and it makes total sence .
I just got back into Helis after a 18 yr break and there is so much to learn Between , lipos , Chargers , fbl units , simulators , and then practice !!
Anyway thanks .

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03-16-2015 11:40 PM  3 years agoPost 4
icanfly

rrElite Veteran

ontario

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anyone making a brushless hv is worth their salt, if you have the funds, there are some new ones by kst which I would buy right away at $100 each or so. Most brand name bl servos will only cost more. Regular hv coreless should be half the price of those numbers for decent quality, take your pick of any brand and go with it.

I read about your bake off of all the servos on one of your helis recently, I'm assuming that is what these new ones are for.

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03-17-2015 12:34 AM  3 years agoPost 5
Cobra 46

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Cambridge il usa

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Yes it was a bake off and I lost !!! Thanks icanfly

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03-18-2015 03:01 AM  3 years agoPost 6
Cobra 46

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Cambridge il usa

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After I ruined my servos with 8 volts !!!
So a friend brought over some savox servos for me
But now they are 25 spline . I'm supposed to have them 17 mm for cyclic per instructions !!! and the arms I have are 16 mm or 19 mm can I use Eather one ?

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03-18-2015 03:49 AM  3 years agoPost 7
EEngineer

rrProfessor

TX

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25 spline
Look at it this way.....

More "splines" allows for "closer" alignment of the servo arm to "90 degs." relative to the servo....at neutral stick.

Which, in turn, results in more equal deflection on either side of neutral stick(more equal FP/FN collective with respect to each other).

More splines are thus better.

If I changed # of splines, I'd have to re-measure everything.

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03-18-2015 04:27 AM  3 years agoPost 8
Cobra 46

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Cambridge il usa

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Ok good thought !! Thanks EE

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03-18-2015 04:34 AM  3 years agoPost 9
EEngineer

rrProfessor

TX

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The 16mm...18mm...distance is for the swash geometry.

Two different issues.

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03-19-2015 06:05 AM  3 years agoPost 10
Cobra 46

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Cambridge il usa

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Ok. I ordered the right arms !!

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HelicopterMain Discussion › Md 800 servo update
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