Never thought of the scale to measure poundage of thrust or pull, I may be able to do that, will ask around. Thanks again for the tips & now that you mention it never really ac-cured to me to look for MAP/RPM correlation to power/thrust output, was mainly going by feel/accell from launch & pull on the truck feels like she wants to go. David.
----- Original Message -----
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 15, 2010 5:12:40 PM
Subject: [FlyRotary] Re: Test
I know you will, David, but felt I had to speak up.
Can never be to careful at any time with this hobby, but particularly in the early part where you are still learning the aircraft and engine. Sounds like you are certainly getting plenty of RPM and good manifold pressure. I usually caution folks with adjustable props to be careful - in that you can set the pitch to get wild rpm but insufficient thrust.
A gent I was acquainted with back in the late 1990s (electronic whiz - sold modified auto ECUs for aircraft use), set his adjustable such that he got lots of rpm, but unfortunately not enough thrust to propel him safely out of ground effect. Crashed into a cactus because He could never climb out of ground effect.
But if you are getting 5950 at a load of 29.5 (WOT) then that tells me you have the engine well loaded. If it were 5950 at say 20-22 inches I would say you need to increase the bite (pitch) of the blades. However, with that high a manifold pressure things look good to me.
Now if you would just put a 1000 lb fish scale in that line you have tied to the truck, we could get some real thrust measurements {:>)
Looking forward to hearing the results
Ed
Sent: Friday, October 15, 2010 2:52 PM
Subject: [FlyRotary] Re: Test
Thanks Ed, will do. Am getting 5950 RPM, 29.5 MAP static (tied to PU truck) Ivo Prop three blade 68" elect. adjusted to fine pitch ( I think I miss-spoke earlyer, another post, prop dia. of 72", our is 68", I do have a 72" two blade, not using ). David R. Cook RV6A Rotary.
----- Original Message -----
From: "Ed Anderson" <
eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 15, 2010 11:53:11 AM
Subject: [FlyRotary] Re: Test
Enough to get the old heart a pumping - I still recall it like yesterday.
Be careful on high speed taxi - always make certain you and aircraft are ready for flight - even unintended flight. Some folks advocate NOT doing high speed taxi test due to increased risk during that phase. I recall one accident - where individual had not removed control locks - because he was not going to fly, only do taxi test, well he unintentionally lifted off - fortunately only damage to the airplane. I know you won't do that, David, but just be prepared for flight in any case.
Good luck
Ed
Sent: Friday, October 15, 2010 11:31 AM
Subject: [FlyRotary] Re: Test
Ok I'll say something;;; Insurance coverage for N655HC will be bound on the 18th of this mth. so high speed taxing will get started, are running the eng. high power w/cowel all in place testing for any cooling problems, that starts sat. or this evening, now I need to get me up to speed/airworthy. David R. Cook RV6A Rotary Lansing MI.
----- Original Message -----
From: "Tracy Hallock (RR)" <thallock2@austin.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, October 15, 2010 10:12:41 AM
Subject: [FlyRotary] Re: Test
Yep, it's quiet, but mail is getting through.
Sent: Friday, October 15, 2010 8:55 AM
Subject: [FlyRotary] Test
Test - too Quiet