More tunnell hull steering set-up ? using HS-5646WP

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riggerman

Well-Known Member
Joined
Mar 18, 2003
Messages
360
Hi all tested the P-spec W.O.F 30 yesterday i determined 45 degree servo through each direction is way to much and i will change the steering rod geometry by moving the 2 pushrods in on the steering arm . As for servo speed the HS-5646WP is rated at .2 sec /60 degrees at 6v at 157 oz torque . The Swordfish 220 amp esc bec voltage rating is 5 v . Would i be correct assuming the lower voltage the servo would be even a bit slower ? MY other concern would be on 5v bec that i will also loose more steering torque ? Would a flatter running attitude on a tunnel hull also contribute to hooking while turning? Regards Andris Golts.
 
Andris,

45 is WAY to much...

157 on an electric boat is VERY light.. to me.. not enough power

looking at the specs on the servo you will need to change your voltage output on the controller. 5V is WAY to low for this servo. The speed

Yes.. a flat running tunnel can cause hooking. Its not a rule but it CAN be problematic.

Grim

HS-5646WP Servo Specifications Performance Specifications Operating Voltage Range (Volts DC) 6.0V ~ 7.4V Speed (Second @ 60°) 0.20 ~ 0.18 Maximum Torque Range oz. / in. 157 ~ 179 Maximum Torque Range kg. / cm. 11.3 ~ 12.9 Current Draw at Idle 4.5 mA No Load Operating Current Draw 330 mA Stall Current Draw 2,100 mA Dead Band Width 4 µs Physical Specifications Dimensions (Inches) 1.65 x 0.83 x 1.57 Dimensions (Metric) 41.8 x 21.0 x 40.0 Weight (Ounces) 2.15 Weight (Gram) 61.0 Circuit Type G1 Programable Digital Motor Type 3 Pole Metal Brush Ferrite Gear Material Metal Bearing Type Dual Ball Bearing Output Shaft (type / Ømm) Standard 24 Case Material Plastic Dust / Water Resistance IP 67 Connector Gauge (AWG) / Strand Count 22 / 60
 
Mike Z. (Grimracer) once told me that many of the handling issues he's seen in OPC tunnels were because of weak servos. Told me that early on, so I've never used less than a 245+ in/oz. Servo on my P-LTD Tunnels.

Also, if you can go digital, that's better as well. They return to a more absolute and consistent center. Makes the driving more predictable.
 
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Thanks to both of you for your input i will have to up the rx voltage . I have a 2s 7.4v 600 mah 20 c lipo on the shelf would this help ? the main issue i discovered after doing more testing tonight the servo is not centering itself its slightly kicked to the left or to the right . Regards Andris Golts.
 
Thanks to both of you for your input i will have to up the rx voltage . I have a 2s 7.4v 600 mah 20 c lipo on the shelf would this help ? the main issue i discovered after doing more testing tonight the servo is not centering itself its slightly kicked to the left or to the right . Regards Andris Golts.
From what I can tell from the specs Mike posted that's an analog servo? If that's then the lower power (torque), combined with it being analog, and possibly some tension in the system do to the pushrod setup, can cause centering issues.

I'd recommend focusing on the Hi-Torque series of servos, whichever brand you choose, and get a digital. You don't need "Hi-Speed" servos on any RC Boat... especially an OPC Tunnel or a Rigger.
 
I'm going to be the odd man out here. My go to servo for this application would be a Hitec 645mg on 6v. Not digital and only 130ozin.

The servo that you are running should be more than enough. Get the voltage up to at least 6v.I would go 2c life. If it still won't center and the linkage is not binding, throw it away.
 
I'm going to be the odd man out here. My go to servo for this application would be a Hitec 645mg on 6v. Not digital and only 130ozin.

The servo that you are running should be more than enough. Get the voltage up to at least 6v.I would go 2c life. If it still won't center and the linkage is not binding, throw it away.
That would be 2S or 2 cells(3.3volt) in series. For LiFe 6.6 volt total.

2C is the load the pack can safely accept. 2 times the capacity.
 
Hi all solved my servo centering problem the Swordfish 220 amp has a bec voltage output of 4.95v removed the + pin and im using an external 2s 7.4v 600 mah 25c rx pack which gives me the full 178 oz torque this made a world of difference in the tunnel's steering .Now im considering stepping up to 5s lipo with a Leopard 1900 kv 3674 motor . Regards Andris Golts.
 
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