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>> Home > Forum > Hobby Chit Chat! > Twin screw
Twin screw
(434 views)
Author Message
georgeo5664
(Lieutenant)





Forum Posts: 62
7th Aug 2018 10:18  
>> Permalink
mdlbt.com/44768

Hoping I might find out some advice I have a smit zweden and one motor seems to be running faster then the other anyone got any ideas?

RNinMunich
(Fleet Admiral!)





Forum Posts: 2483
7th Aug 2018 14:28  
>> Permalink
mdlbt.com/44779

Hi George,
Had this snag with my Graupner Graf Spee as well. In my case the stbd prop tube was misaligned 😲 Major surgery 😡
First off; it's unlikely that the motors are perfectly matched, but if the difference is that noticeable I would suspect the cause lies in propshaft resistance and / or dry motor bearings!
I would disconnect the prop shafts, oil the motor bearings and run them in a bit off load for a few a minutes. See if you notice a difference there at low speeds.
Also; remove both shafts; clean and oil. Clean the tube end bearings with a pipe cleaner and some light machine oil.
Squirt some Teflon grease into the tube from the prop end. I use a small plastic syringe for that.
Before reassembly check as far as possible that neither shaft or tube is bent at all🤔
If all seems straight reassemble and run the motors at medium speed a minute or two then slowly and see if you can still detect a difference.
Reduce the throttle gradually until the motors stop. If one stops significantly before the other that suggests extra friction in that drive train; misalignment somewhere! Thrust washers too tight?
BTW: which motors? One ESC or two?
Hope this helps!
Cheers, Doug 😎


Young at heart - slightly older in other places 😉 Cheers Doug
georgeo5664
(Lieutenant)





Forum Posts: 62
7th Aug 2018 17:25  
>> Permalink
mdlbt.com/44784

Thanks Doug for your response I will try everything you mentioned I have decaperm motors and dual esc from action electronics.
Cheers George

RNinMunich
(Fleet Admiral!)





Forum Posts: 2483
7th Aug 2018 18:29  
>> Permalink
mdlbt.com/44788

Hi George,
Good setup for a tug, mighty meaty👍
With or without gearing?
I had one in my Sea Scout but the performance was 'sedate'🤔
Pic shows the old and the new !

For a tug they should be ideal though, lots of pull😊 How big / heavy is your tug?
I also have the P94 dual ESC from action. Was going to put it in my Southampton tug but now think it would be more useful in my 53" destroyer because of the rudder mixer!
Hope some of the tips solve your snag, fingers crossed😉
Cheers Doug 😎


Attached Files - Click To View Large


Young at heart - slightly older in other places 😉 Cheers Doug
georgeo5664
(Lieutenant)





Forum Posts: 62
7th Aug 2018 18:56  
>> Permalink
mdlbt.com/44789

Doug thanks again for all your help not sure if my motors are geared or not but they look exactly the same as yours. My tug is 1/24th scale I think lol
Cheers George


Attached Files - Click To View Large

RNinMunich
(Fleet Admiral!)





Forum Posts: 2483
7th Aug 2018 19:14  
>> Permalink
mdlbt.com/44791

Hi George, if they look the same as mine then they are geared! Good for a tug. The gear box is the bulge at the business end 😉
Might pay to apply a little Teflon grease to the gears!?

BTW: The P94 has a rudder mixer built in to assist with turning!
It might be that you are chasing a ghost😲
If the rudder trim is a bit off centre it might affect the motor speeds?
Effect depends a bit on the Mode you selected on the P94. Especially in Mode 3!
Nevertheless; the above tips are good maintenance routines.
Have fun, cheers, Doug 😎


Attached Files - Click To View Large


Young at heart - slightly older in other places 😉 Cheers Doug
onetenor
(Fleet Admiral!)





Forum Posts: 461
8th Aug 2018 02:34  
>> Permalink
mdlbt.com/44817

I use silicone grease. Looks like Vaseline. Works great.🤓👍
Can't open the PDF Doug. I have Adobe ????👍

RNinMunich
(Fleet Admiral!)





Forum Posts: 2483
8th Aug 2018 07:08  
>> Permalink
mdlbt.com/44824

Mornin John,
pdf works fine for me!
Left click on the icon so that the larger one appears in the 'Media Gallery' window.
Then left click on [Download] in the top left corner of the window.
Windows then asks you if you want to Open or Save the file.
If you're using a phone - DON'T!!
Cheers, Doug😎


Young at heart - slightly older in other places 😉 Cheers Doug