Graupner Glasgow drive gears.

[stuart.alexander8]

Hello. Can somebody please help me as I have a Graupner Glasgow that I purchased second hand 2 years ago. My problem is that the standard small 13 tooth drive gear has broken, the large 39 tooth gear is ok. I have tried to get replacements from Cornwall Models and Westbourne Models to no avail. Graupner will not reply to e-mails probably as they have gone belly up. Does anybody have suggestions on alternative gears to use or a company that can supply a replacement. I have been to a gear milling company this morning who advised me that these gears are far from standard and to mill a replacement will not be cost effective.
Many thanks for any advise.

[jelley_baby]

Hi Would either of these be of any use they would probably need modifying. These are links to Items I have bought in the past from Ebay both are gearboxes designed for aircraft but I have used them successfully in many model boats.

http://www.ebay.co.uk/itm/RC-Model-Aircraft-Metal-Gear-Box-with-3-Metal-Motor-Gear-for-R-C-Airplane-GB087-/271160011154?pt=US_Character_Radio_Control_Toys&hash=item3f22656992

http://www.ebay.co.uk/itm/RC-Model-Big-Size-Metal-Gear-Box-with-3-Metal-Motor-Gear-for-R-C-Airplane-GB090-/390550375592?pt=US_Character_Radio_Control_Toys&hash=item5aee9dcca8

I attached some photos of them in case the links don't work.

Graham

[peter ravenscroft]

can you measure the od of the gears if so add 2 the number of teeth and divide it ie 39 +2 divided by od that will give you the dp then you can order a spare from tecnobots or similar
hope this helps
regards
peter

[chipmonk]

Hi there, To be honest I think you are going to need to replace both geers. You can use any 3:1 ratio as long as they will fit the drive shafts. As a suggestion try looking at the S.H.G. marine web site(www.shgmodels.com). Or how about meccano chain and sprockets? I am using them on my new steam paddler.
Cheers Chris M

[bill stafford]

gday , if you have to replace the ponnion gear , go the whole way , and fit toothed belts , XL in preference , i have to my paddlers , and they go for years !!!
MXL are a bit fine , too much load, another good choice is HTD metric , bigger teeth
i have the same kit , and from new , Im fitting toothed belts
bill

[grumpysumpy]

hi
when i built my strongbow (glasgow lookalike or similar) i used a model tank motor and gearbox. this gave me independant paddle control at a speed of 160 rpm with a 12v supply. drops back to about 120 rpm with a 7.2v supply. using plan size 100mm paddles speed is true to scale and looks fabulous. can get a bit busy at times if rudder is required. rudder is the 3rd channel. ACTion electronics P96 mode 3 is probably the best option if a single throttle stick is required.

my other aft mounted sidepaddler with 180mm paddles uses T5 beltdrives and MFA 50:1 385 single reduction motors. these motors are good from 4.5v to 15v and naturally final rpm is completely dependent on supply voltage and throttle input.

hope this helps

gordon
grumpysumpy from downunder.