|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

11-27-2011, 07:17 PM
|
|
|
|
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
|
|
Quote:
|
so it acts in pitch, not yaw
|
That explains why I have to use up-rudder on takeoff.
__________________
Actual repeat offender.
|

11-27-2011, 07:52 PM
|
|
|
|
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,090
|
|
This looks like a great project. This is what experimental aviation is all about. I wish the builder the best of luck!
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
|

11-27-2011, 07:57 PM
|
|
|
|
Join Date: Mar 2005
Location: Bellevue, NE
Posts: 686
|
|
Quote:
Originally Posted by johnny stick
Jim,
I do not want to hijack thisd thread, but p-factor says the downward blade has more pitch therefore it produces more thrust on the one side, The OWT forgets this is a spinning propeller so it acts in pitch, not yaw. Helicopters and propellers share the same physics.
|
I understand what you're talking about...that is when one applies a force to a spinning object, the resultant movement is 90 degree later in rotation (spinning bicycle tire proves this well)...as does rapidly raising the tail in a conventional aircraft. However, helicopters rolling left because of retreating blade stall like descending propeller blades with more angle of attack (assuming positive aircraft pitch) providing more thrust than the rising propeller, does not follow that behavior. Still not convinced P-factor is an OWT.
And to keep it RV-6A reborn as a JAG-2 related...I sure hope all these aerodynamic forces stay in harmony for this project.
-Jim
|

11-27-2011, 09:24 PM
|
 |
|
|
Join Date: May 2005
Location: Santa Barbara, CA
Posts: 1,324
|
|
A little History...
http://en.wikipedia.org/wiki/Wing_Derringer
John Clark ATP, CFI
FAAST Team Representative
EAA Flight Advisor
RV8 N18U "Sunshine"
KSBA
|

11-27-2011, 09:56 PM
|
|
|
|
Join Date: Feb 2005
Location: Minneapolis
Posts: 2,473
|
|
I'm with Peter....this just makes me go "hmmm"...I have sorta the same reaction to the Tripacer I saw with a T-Craft wing scabbed on the bottom of it a couple years ago - and yes, it still had it's top wing!
I guess I can't say too much without being sort of a hypocrite since I'm building something about the size of an RV with 500hp engine (that also hasn't been built for 50+ years) on the front!
Cheers,
Stein
|

11-27-2011, 10:03 PM
|
|
|
|
Join Date: Nov 2005
Location: KRTS
Posts: 1,798
|
|
I've never heard my dad say ANYTHING good about his Corvair. Never heard anyone say anything good about a Corvair motor. Who would want to fly behind one? Let alone between TWO?!?
__________________
Next?, TBD
IAR-823, SOLD
RV-8, SOLD
RV-7, SOLD
|

11-27-2011, 10:16 PM
|
 |
|
|
Join Date: Jun 2007
Location: Fairbanks AK
Posts: 758
|
|
Quote:
Originally Posted by SteinAir
I'm with Peter....this just makes me go "hmmm"...I have sorta the same reaction to the Tripacer I saw with a T-Craft wing scabbed on the bottom of it a couple years ago - and yes, it still had it's top wing!
I guess I can't say too much without being sort of a hypocrite since I'm building something about the size of an RV with 500hp engine (that also hasn't been built for 50+ years) on the front!
Cheers,
Stein
|
Stein Please elaborate! 500HP and the size of an RV?
-david
__________________
RV-7 N87DX Built, Flown, and Sold!
|

11-27-2011, 10:20 PM
|
|
|
|
Join Date: Dec 2008
Location: Los Angeles, CA
Posts: 301
|
|
p-factor last words I'll say
retreating blade stall causing a roll is also a OWT IMHO. I believe both these things are mis understood. There are other things that cause the right foot on climb out, the yaw when the tail is lifted, the reported roll with retreating blade stall (never experienced this in a heli either until I hit control limits), etc Everyone has their own ideas, I don't think I will change peoples minds, lets just leave it at that. By the way, it is only 90 degrees for helis. For a rigid attachment aka propellers, the precession force is more like 70 degrees, so there is some yaw, but a whole lot of pitch. The math is published in a book written by an old time Lockheed (Burbank) engineer.
Sorry to hijack this thread. Please start a new thread or PM me if anyone wants to discuss further.
Nice twin, I give him kudos for trying to do something different. I think we will all benefit from his experience and experimentation.
|

11-27-2011, 10:29 PM
|
|
|
|
Join Date: Feb 2005
Location: Minneapolis
Posts: 2,473
|
|
Quote:
Originally Posted by Flyguytki
Stein Please elaborate! 500HP and the size of an RV?
-david
|
The MULLICOUPE
Though it usually doesn't garner the same reaction as a Twin Wing Tripacer or Twin Engine RV!
Cheers,
Stein
|

11-27-2011, 10:50 PM
|
 |
|
|
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,766
|
|
Quote:
Originally Posted by Sig600
I've never heard my dad say ANYTHING good about his Corvair. Never heard anyone say anything good about a Corvair motor. Who would want to fly behind one? Let alone between TWO?!?
|
I built many of these years ago for street and track. Actually a pretty robust design if you pay attention to detail and use a few modern parts. There are many flying now and with the 5th bearing installed to take the prop bending loads properly, they have been quite reliable.
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 06:47 AM.
|