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A while back I got the bug to convert one of my 600 size electrics to a three blade setup. Without being able to see these rotorheads up close I had to just take an educated guess about what might fit, looking at things like where the Jesus bolt is placed etc. So I took a chance and bought a JR MB-331 rotorhead kit with blades from RC Japan. It is made for the JR 550 size electric heli.
What seemed like the perfect heli to try it on is the Beam Avantgarde. When I received the package I had a look at the swash that comes with it which is a 140 degree layout and trying to fit that onto the Beam would put the linkage at some strange angles as the Beam is 120 degree. One nice thing about the Beam is that the swash comes apart very easily and I opted to have a spare inner swash part drilled and tapped for the three blade head.
Many thanks to Trev (Dillwacker) who volunteered to help get the mods done and soon I had the inner swash back with two new holes at 120 degrees for the three blades. Fitting it was a no brainer as it just threads on so I fitted it onto the swash, (and it came with a set of link balls as well so I didn't have to touch the original part or rob anything from it, if I want to go back to the two blade head it's as simple as just popping the other swash inner piece back on).
I managed to get three links from the swash to the grips, once again I didn't want to alter the ones I was using on the two blade head so I rounded up some links that almost fit, they're just slightly too long so ideally if this works well I'll find some a bit shorter but they'll do for now I just adjusted the pitch curves down at mid stick to get zero degrees again.
Sooooooo, it is now ready to fly. I did a quick test hover in the garden and all is well. The JR head looks totally at home on the Beam because it has the red and black colour scheme.
Here's a few pics:
What seemed like the perfect heli to try it on is the Beam Avantgarde. When I received the package I had a look at the swash that comes with it which is a 140 degree layout and trying to fit that onto the Beam would put the linkage at some strange angles as the Beam is 120 degree. One nice thing about the Beam is that the swash comes apart very easily and I opted to have a spare inner swash part drilled and tapped for the three blade head.
Many thanks to Trev (Dillwacker) who volunteered to help get the mods done and soon I had the inner swash back with two new holes at 120 degrees for the three blades. Fitting it was a no brainer as it just threads on so I fitted it onto the swash, (and it came with a set of link balls as well so I didn't have to touch the original part or rob anything from it, if I want to go back to the two blade head it's as simple as just popping the other swash inner piece back on).
I managed to get three links from the swash to the grips, once again I didn't want to alter the ones I was using on the two blade head so I rounded up some links that almost fit, they're just slightly too long so ideally if this works well I'll find some a bit shorter but they'll do for now I just adjusted the pitch curves down at mid stick to get zero degrees again.
Sooooooo, it is now ready to fly. I did a quick test hover in the garden and all is well. The JR head looks totally at home on the Beam because it has the red and black colour scheme.
Here's a few pics:
Attached Files
and a platinum star 
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