RDH, roll drive system, is featured in significant new models such as the Rotmilan and Freestyler 4. It allows a clean installation using a conventional linkage mechanism not to be confused with RDS, which is rotary drive system. RDH is more of a conventional pushrod system which we are all used to, just done very well! It has to be as using small arms and horns puts a much bigger load on the linkage system, which great servos like MKS can take but all a bit wasted if you linkage system bends or distorts! Problem is RDH in new models is designed with a 2mm pin located in the flaps or ailerons instead of a horn which is no big deal to replicate but...We developed a brass adapter to use conventional 2mm pushrods (super duper 303 grade stainless steel ones preferably!) and your existing horns! It's 2.4mm thick much more than a normal horn which is usually 1.6mm. So now these super strong arms, which incidentally only fit MKS splines, can be used installations without major surgery on your existing horns and where a really short arm length is beneficial. They come as 5 and 6mm and easily the strongest solution for this kind of arm size. Take a look at the movement possible without binding and it can be used in conjunction with the Fu-Fix external bearing kit too for an incredibly strong installation!
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| over 100 degrees travel |
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| Bearing kit shaft fits! |
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| The adapter has other uses! |
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| Instead of 90 degree L bend! |
The adapter is also a great solution for using small arms when clevises are just to big or you don't fancy grinding away to make them fit! The other solution and previously the only way to do this was to use a 90 degree L bend. Not easy to do with stainless steel push rods and certainly not adjustable. This way is! Its tighter to the arm too, so reducing some of the side load forces. The adapters (have to think of a better name for these!) are available now and so too, the RDH arms.
Adapters are £10 for pack of 10 and RDH arms are £11.99/ pr.
RDH, roll drive system, is featured in significant new models such as the Rotmilan and Freestyler 4. It allows a clean installation using a conventional linkage mechanism not to be confused with RDS, which is rotary drive system. RDH is more of a conventional pushrod system which we are all used to, just done very well! It has to be as using small arms and horns puts a much bigger load on the linkage system, which great servos like MKS can take but all a bit wasted if you linkage system bends or distorts! Problem is RDH in new models is designed with a 2mm pin located in the flaps or ailerons instead of a horn which is no big deal to replicate but...We developed a brass adapter to use conventional 2mm pushrods (super duper 303 grade stainless steel ones preferably!) and your existing horns! It's 2.4mm thick much more than a normal horn which is usually 1.6mm. So now these super strong arms, which incidentally only fit MKS splines, can be used installations without major surgery on your existing horns and where a really short arm length is beneficial. They come as 5 and 6mm and easily the strongest solution for this kind of arm size. Take a look at the movement possible without binding and it can be used in conjunction with the Fu-Fix external bearing kit too for an incredibly strong installation! 
Tony, in the "instead of 90 degree L bend" image, how is the adapter attached to the servo arm i.e. what's the silver screw looking thing ?
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