Twinnrexx

[therocket1978]

Hey there fellow helicopter flyers
I have a Twinnrexx with a 3 blade head
I am struggling to get finished
Any help or advice and knowledge would be greatly appreciated and with transmitter setup

[teamdavey]

Not enough info there to really help much.

Are you using the mixer unit that can be bought as an option or using an FBL to drive four servos?

There is a fair bit of info around both here https://www.helifreak.com/showthread.php?t=902245 which is my approach and has been duplicated with success.

There is more here https://www.scalerchelis.com/phpBB2/...ic.php?t=20246 with links to more detail on the set up.

A couple of comments:

There are only two FBLs that support 4 servo tandem as far as I know - the Brain an the Special version of the demon. Otherwise you need some form of special mixing electronics to enable using a conventional FBL unit to drive 6 servos.

Be vary wary of running rigid three blade heads - yaw control will be marginal and there is a finite risk of throwing a blade eventually due to overstress of the feathering axles.

Jim Davey