JohnMcGowan
Posts: 810
Joined: 12/14/2001
From: Birmingham,
AL, USA
Status: online
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Falling,... looks like you are getting closer for sure, Its looking great, btw.
I took my ultimate out today to try and find some speed for it by trying several props. I started out with a APC look alike 16x8 that has a fake carbon fiber overlay on it , it looks like its a carbon fiber prop anyway, lol. I had stopped by the area police station located not too far from our flying field and asked if one of the officers on duty wouldnt mind stopping by later on and clock my plane for me, he said no problem. So once I arrived at the field, the policeman showed up a little later and he pulled to the side and end of the runway - (at a safe place mind you), so I took off and made a couple circuits and then showered down on the throttle. The first couple passes he clocked a 72, a 78 an 88 and an 83 mph. All this was with me flying into the appx 12 mph wind when he would clock me. My plane also has no canopy or cowling on it as of right now. So I landed, changed props to a 16x10 APC and noticed that I wasnt turning as many rpms as the first prop now- the 16x8 was turning 9200, the 16x10 was now turning 8800, so I thought this isnt going to be as good as the first runs , now that the rpms are down a little  , so anyway I made a few circuits then opened her up full bore as I flew so the local police could clock me.The first pass yielded 89, then a 91, a 96 and finally a 99 mph! If anyone would have asked me, I would have swore the 16x10 prop would have seemed slower, but I guess the radar gun doesnt lie does it? Im just wondering if I will gain a tad more mph once I clean up the drag by mounting the canopy and cowling? Me and another club member are supposed to race our ultimates next weekend, he has the ARF version and mine is the kit built one. I would say that with what I ran with todays speeds, I'm a contender for the race next weekend - I hope! 
Sorry , didnt mean to hijack your thread fallingleaf, I just wanted to share some info with you guys.
Thanks,
John
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All Forums >> RC Airplanes >> Kit Building >> RE: Goldberg Ultimate Biplane Engine 
RE: Goldberg Ultimate Biplane Engine - 
so out with some of the Great PLanes ones to complete hinging on the top wing. The wing centres are all as smooth as I can get them and will hopefully show up good. I will be fitting the tail bracing wires next. I think its still a little nose heavy so the sullivan kit I have pictured should do well with the steel wire supplied with it. There is a kevlar option but given the nose weight I will go with the steel. 
