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Old Feb 24, 2012, 09:30 PM
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Habu 32 -- where to use metal gear servo's ?

Hi ,

i have 4 metal gear servo's , and 4 nylon gear servo's ,,

the hitec hs-85 series servos


where is best place to make use of the Metal Gear servo's ? flaps , nose wheel ?

ok, thanks, Joe
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Old Mar 24, 2012, 05:47 PM
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Quote:
Originally Posted by rcfun2005 View Post
Hi ,

i have 4 metal gear servo's , and 4 nylon gear servo's ,,

the hitec hs-85 series servos


where is best place to make use of the Metal Gear servo's ? flaps , nose wheel ?

ok, thanks, Joe
It depends on your plane, whether your flying hard 3D, going fast or cruising...

But GENERALLY speaking, I've read that metal gear servos are best for the nose wheel (because since it impacts the ground, nylon gears tend to strip), flaps (Because they tend to be the largest of the control surfaces that generate a lot of load on the servo) and the rudders.
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Old Mar 24, 2012, 05:54 PM
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Huh, thats funny, I would go completely the opposite and put the best servos available on the most important parts, Ailerons and evelators.

I've never seen a plane destroyed because of a stripped steering servo, also unless your landing in severe cross winds regularly you shouldn't be stripping steering servos anyway, if you are you probably don't have enough slack in you steering system.

I've had issues with flaps and if your a decent pilot most of the the time you can still bring the plane back.

Having said all of this, on this particular plane unless you plan on putting a 150mph setup in there you shouldn't need metal gears anyway, if you set everything up correctly with no binding and are not 'hot dogging' every turn you shouldn't be stripping anything.

Good luck
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Old Mar 24, 2012, 06:07 PM
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4 is not enough, I would do the elev, and flaps and nose wheel steering
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Old Mar 24, 2012, 06:34 PM
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My buddy Tom and I put MG 85's on the steering, flaps, and rudder. Standard 85's everywhere else. About 100 flights each now, up to Stumax power now, no problems. IMHO the only place you should use an MG servo on the Habu 32 is the nose gear steering. The Habu is not very demanding for servo loading. It is more like a pattern plane than a 3D plane. If you can put the flap servos on a slow setting so they won't slam to full travel at full speed and try not to put them out when you are going 150mph they will hold up well. On 3D planes the rudder servos take the biggest beating and blowback can be a noticeable problem but not on the Habu. Generally speaking nylon gear servos are more precise than their MG counterparts, their gear mesh is usually tighter, so they are best on ailerons and elevators where you will really notice that precision, especially at very high speed. MG servos are not better, just a little tougher.
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Old Mar 25, 2012, 03:58 AM
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Why do people put metal gears on steering, I have always used relatively inexpensive small plastic servo's for steering and haven't stripped one yet, I have owned all manor of planes including a dynamax powered starfire and still have never had a problem with stripping steering servos.

you shouldn't be experiencing bump steer on an edf so if your stripping servos there is a problem somewhere else, probably steering linkage too tight.

Kim
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Old Mar 25, 2012, 04:03 AM
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I was just thinking about this and realised,

I made a break away linkage for my starfire steering (really loose clevis that can pop off) so that in the event of a poor landing of getting caught in a rut on the runway my servo would be saved.

The jet weighs over 17lbs and lands at probably 50 plus mph, only once has the clevis pop'd off when I came in a little fast and had to wiggle the jet vigirously to slow it down, it pop'd off and the plane circled to a stop, this is proof enough for me that steering servos shouldn't be experiencing that much torque.
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Old Mar 25, 2012, 04:58 AM
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No need! I use HS65 on all surfaces. No problems what so ever!
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Old Mar 25, 2012, 01:11 PM
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Good man! Now we know the 85's are more than necessary and can fly with confidence... Who will try HS56's? Cmon guys!
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Old Mar 25, 2012, 09:13 PM
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Originally Posted by lightningmcnul View Post
Why do people put metal gears on steering, I have always used relatively inexpensive small plastic servo's for steering and haven't stripped one yet, I have owned all manor of planes including a dynamax powered starfire and still have never had a problem with stripping steering servos.

you shouldn't be experiencing bump steer on an edf so if your stripping servos there is a problem somewhere else, probably steering linkage too tight.

Kim
I have a giant scale A6M5 Zero (approx 25lbs), and I had the same principles myself. I figured steering servos can be the cheapest servos since they're really only good for taxing. But after my plane's second landing, the tailwheel servo (I had a dedicated plastic gear tailwheel servo despite this model being a tail-dragger) had stripped. The landing was routine, smooth and insignificant, however the servo still stripped.

The servo was brand new, standard sized, digital Spektrum A6000
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Old Mar 26, 2012, 05:36 AM
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are you saying that as soon as your tail wheel touched the ground it stripped because on most of my tail draggers, even my 103" nosen p 51 by the time the tail comes down your doing little over 15 mph so if your stripping servos I can't see it being the servos fault

also in edf there is usually less weight over the nose wheel, they have to rotate so the weight should be almost balanced on the mains with a little bias to the front if the mains are in the right place, if there is little weight over the nose then it stands to reason that there can only be a little stress!
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Old Mar 28, 2012, 12:34 AM
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Originally Posted by lightningmcnul View Post
are you saying that as soon as your tail wheel touched the ground it stripped because on most of my tail draggers, even my 103" nosen p 51 by the time the tail comes down your doing little over 15 mph so if your stripping servos I can't see it being the servos fault

also in edf there is usually less weight over the nose wheel, they have to rotate so the weight should be almost balanced on the mains with a little bias to the front if the mains are in the right place, if there is little weight over the nose then it stands to reason that there can only be a little stress!

I dunno exactly what happened or even if it was the landing that caused the strip
but the tailwheel was fine on take off (I could steer the plane around on the ground) and then when I landed it was stripped (I had lost my steering ability completely...it wasn't a bumpy/hard landing either, main gear first followed by the tailwheel...hmmm...

And that servo was a new one...and it wasn't driving anything except for just the tailwheel...maybe I just had a bad one?
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Old Mar 28, 2012, 07:22 AM
Aka: Tom Jenkins
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Since the OP asked what type of servo gear train to install in a HABU 32, nothing else,
Here's a tip: I like to save burned/damaged MG servos, then I wheel and deal for HS plastic gear servos and change the gears out to the metal gears that I saved.
The OP has some MG's and HS', how else you gonna get metal gears without purchasing new servos/gears and just use what you have?
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Old Mar 29, 2012, 02:40 AM
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thats an awesome tip, i've never thought of it.

don't know why yours stripped but i'd suggest its to do with setup rather than the servo it self.
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Old Mar 29, 2012, 07:00 AM
Aka: Tom Jenkins
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The gears don't strip, the motor burns up or th case gets damage so I get the plastic geared servo around 10 bucks cheaper and ad the previously saved metal gear myself........
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