Hi Ustas,
Thanks for you reply. To day Ispoke with Alan of Weston UK and have ordered the RCV 90-sp with 3 different props an 2,3 and 4 blade.
I will see which one will preform best.I prefer the sp version this design fits betterin a cowl. Oninternet you can findmanybuilding threads ofhandmade Balza cowlsforaFourstars 60.
The in-cowl exhauste from Genesis (silencer) I wanded to order with the engine, will be supplied after I have finishthe cowl.
Important is, toknow the remaining space to fit the silenser. Next, this silencer willinprove an300 rpm to the prop. See this site
http://www.westonuk.co.uk/westonuk2_226.htm
If youare interestedabout myprogres I willplace some images.
Kind regards
Hans