Thanks for the interest....glad to see others are interested in SPAD's and GYRO's at the same time.

The hub I machined from a plastic called "Black Delrin". We commonly use it for low speed bearings or grippers for handling machine parts etc. It machines dimensionly very accurate with a great finish while having good strength to weight ratio (perfect for SPAD's). I have used it in the past for my firewall's on my Dogfighter and DasPlastic. I'd say it's heavier than a wood/ply rotor...but is way more robust (crash survivability!!!). I hope to pre-spin the rotor for ROG using a cordless drill (I hear 400-600) should be right). The cone is store bought and adapted to my bearing retainer. I had to raise it above the flapping stops for clearance. This rotor is a near copy of Emilo Cabezas DC Gyro published by RCM (plan 1244). All I've done is convert wood to plastic (the SPAD way).

I figure the plans might be a bit old and things have progressed some since. My question was about the rotor design and the flapping range of motion. The drawing called for -1 to +10 dergess of travel. I read a post that up to +20 is better. Also there is talk of +15 degrees of blade advancement at the tips....was wondering if the blades set square to the root will be fine as well for know?

I've included a picture (a little blurry...sorry) of the rotor. Let me know if you'd like any others.


Splinter.