Most modern deign R/C helicopters use a similar starting system. An electric starter drives a starter extension with a 6mm ball hex driver end that engages into a 6mm hex "cup" that is bolted to the start/clutch shaft. The majority of current helis have a one-way bearing in the system that lets you release the button on the electric starter and remove the starter shaft from the now-stationary hex starting cup. Most kits require that you buy the starter shaft (and of course the electric starter) separately. We stock several, but above are the two best selling versions.

Bottom image in ABOVE photo is the Mavrikk 3801D 6mm Hex start shaft. At under $15 it's the cheapest starting shaft we can get, and has a VERY good hardened end. You need to leave the starting cone and rubber cup on your electric starter, and care needs to be taken that he start shaft stays firmly in the spinner cone while in use.

The JR Start Shaft, above, lets you EITHER insert the big end into a spinner cone (as above) OR you can toss the spinner cone in the trash and just clamp the JR shaft directly to the output shaft on your electric starter. We much prefer the latter option. The JR Hex Starter Shaft sells for around $25. The ends are not very hard and wear out faster than the Mavrikk units.

Note, NEITHER of the above are suitable for helis that do not have a one-way bearing in the starter system. For those you need a start shaft that has the one-way bearing built in. Our Favorite is the Mavrikk 239 (blue base, top photo) which is not only about half the price of the KSJ unit, but also clamps very firmly to the asian starters (Hobbico, Mavrikk, Magnum etc) with no plastic shims. It will also clamp on to the output shaft of the sullivan starteres IF you drill the threads out. The actual start shaft pulls out of the one-way bearing base, which is nice for transport. EXCELLENT unit!

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