Search on Google "Ultrasport UniCopter".

Date: 13-Dec-01 23:26 ~ Author: CA BEATY ~ Subject: UltraSport

As an engineering exercise Gary, this machine is state of the art and thoroughly professional. I understand the design team was mostly moonlighting Boeing engineers.

The rotorblades are built around a carbon fiber "D" spar with syntactic foam core and Kevlar skins over a milled Nomex honeycomb afterbody. Expensive.

A purpose built planetary gear reduction drive. No bicycle chains but again, expensive.

The feathering bearings are music wire torsion packs encapsulated in polyurethane.

Whether a Hirth engine and an overhead stick are appropriate is a matter of some controversy.

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Date: 14-Dec-01 11:10 ~ Author: John Uptigrove ~ Subject: Reduction

I heard that a guy with one of the highest time machines (couple hundred hours I believe) has swapped out his transmission for a home made cog belt drive reduction after getting tired of dealing with it.