RCU Forums - View Single Post - UMS Evolution Radial Care and Operation
Old 11-30-2019 | 01:14 PM
  #2444  
Hyjinx
 
Joined: Dec 2015
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Originally Posted by badangle
Tom, did you beef up wing ?
I'm not sure adding struts is enough...
Any changes to firewall ?
the 7-77 is heavy and i worry about strength of design of Robin Hood 99.
Hey all
Just maidened a 1/4 scale Stearman weighing in around thirty pounds auw.
Was running a 22/12 for the first flight, was tacking just under 6000 rpm.
The plane failed on climbout (can't tell exactly in video, seemed to just lose power on the way up and stalled into the wind at about 100 feet. The test pilot was able to drop the nose and right it before it went it. Miimal damage to my self constructed landing gear. Pilot is the best!
Broke the 22/12 on impact
Beefed up the gear, installed a 24/10 (max by manual), and all I had.
it flew scale but was scary in turns. Need greater air speed to fly it safelyi feel.
i am tempted to tether it attached to a pound scale and make comparisons based on a 22/12, 23/12 and 24/12s
Any initial thoughts?
I have scanned the threads on prop data, there is help there but I am really hinky on this thing.
The prop calculators are helpful. But hands on data means more to me.

Don't want to stuff this thing into the ground with this engine on the front of it.😲
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