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HelicopterAerial Photography and Video › What servos do most use on their Maxi Joker??
12-26-2008 11:08 PM  8 years agoPost 1
jascamera

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san francisco, ca

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Just wonder what is the most robust servos some of your guys use on the Maxi with hundreds of trouble free flights.

Jason

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12-27-2008 07:32 PM  8 years agoPost 2
rroback

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Irvine (UCI), Ca

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9252

Rhett..... I can't fly, but the Profi sure can.

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12-27-2008 09:54 PM  8 years agoPost 3
jascamera

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san francisco, ca

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I am using 9252 on the t-rex600. They are rated at 97oz of torque, will it be sufficient if my Joker weight 25lbs?

One thing that the Joker can improve on is a 4th servo. Like the Air-stars have. So, if one servo fails, heli can still fly.

Anyway that I can can add a 4th servo on the joker?

Jason

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12-27-2008 10:13 PM  8 years agoPost 4
nooobs

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web

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...

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12-27-2008 10:39 PM  8 years agoPost 5
Highviz

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Newbury, Berks, UK

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9252 on one and 9351 on the other

Malcolm

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12-27-2008 11:56 PM  8 years agoPost 6
classic

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All over the place!

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9451's

Which is worse, ignorance or apathy? I don't know and I don't care!

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12-28-2008 10:10 PM  8 years agoPost 7
papatango

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Toronto, Ontario,​Canada

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JR is coming out with a new all-metal(drivetrain AND body) series of 8711 & 8717 servos, with large tourqe and high speeds, operating at 6-8v on a designated 2s set-up; I believe they're shipping in march, at around $200 a pop. Check Esprit Hobbies.

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12-28-2008 10:16 PM  8 years agoPost 8
rroback

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Irvine (UCI), Ca

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and they weigh 10 oz each....

Rhett..... I can't fly, but the Profi sure can.

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12-28-2008 11:58 PM  8 years agoPost 9
papatango

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Toronto, Ontario,​Canada

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Sorry for the hijack, but I too have been looking for new servo options.

Quick stats from the Espritmodel.com pages:

JR metal 8711
Manufacturer JR
Applications Heli/Airplanes/Sailplanes
Type Digital High Torque HV
Torque 4.8V -
Torque 6V 480 oz/in (34.3 kg/cm)
Speed 4.8V -
Speed 6V 0.12 sec/60 degrees
Dimensions 41mm x 37mm x 21mm
Weight 74g
Bearings Dual Ball Bearing
Gear Type Metal SuperSteel

3 X 75g = 225g, 8oz

Futaba BLS25 Heli F3C
Manufacturer Futaba
Applications Heli, S9252 Replacement
Type Brushless High Torque
Torque 4.8V 140 oz/in (10 kg/cm)
Torque 6.0V 179 oz/in (12.6 kg/cm)
Speed 4.8V 0.16 sec/60 degrees
Speed 6.0V 0.13 sec/60 degrees
Dimensions 41mm x 38mm x 20mm
Weight 58g
Bearings Dual Ball Bearing
Gear Type Metal

3 X 58 = 175g, 6oz?(double check my conversions, I might be off here)

It's about a 2 ounce difference for a tremendous amount of tourque, and the new power supply system might save the difference(emphasis on might....).

Does the centering resolution, in your opinion, make for a wiser choice? I doubt my piloting skills could warrant the resolution, but I'd be curious to see the comparison in the hands of an F3C competitor.

Thoughts?

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12-29-2008 03:09 AM  8 years agoPost 10
Horacio

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CA

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I thought the BLS352 might be a good choice. They aren't listed on Esprit, but listed on Tower.

SPECS: Speed: 0.19 sec/60° at 4.8V
0.15 sec/60° at 6.0V
Torque: 200 oz-in at 4.8V
250 oz-in at 6.0V
Size: 1.57 x 0.78 x 1.45" (40 x 20 x 36.8mm)
Weight: 2.2 oz (63g)
$160 plus Tower has their annual end of year discounts.

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12-31-2008 02:38 AM  8 years agoPost 11
snurre

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Sweden, Stockholm

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Hi,
I am using 3x JR DS8717, operating on 6-7VDC. Works really fine in my flybarless setup (Helicommand Profi).
Initially I had 3x Futaba BLS352, but I swapped them for the the JR-servos upon chasing mysterious oscillations in my setup. I had been reading postings about dubious performance of the BLS servos, so I wanted to rule out this as a cause of oscillation.
Afterwards I conclude that the BLS-servos was innocent of the oscillation phenomena and the heli flyed just as well on these servos as on the JR-servos, but at approximately half the current consumtion. However I am likely to stick with the JR-servos in the future, they are superb.

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12-31-2008 05:58 AM  8 years agoPost 12
ehx

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Northern Minnesota

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Any quality servo in an electric used for AP-style flying will last well over a thousand flights as long as it's not underpowered for the job. For a Maxi you need about 90 oz./inch or more torque. More doesn't hurt, but some of the newer offerings at up to ~5 times that number are just unnecessary.

As to servo models that I've put more than 1000 flights on in various standard or Maxi Jokers - the JR 8231 and JR 8311. Both more than once.

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