[rebel-builders] Rebel Questions: tail wrap; engine fit; riveter modificati
Posted: Sun Feb 19, 2012 11:38 am
Here is some interesting reading on VGs.
http://www.stolspeed.com/content.php?id=5
I use the landshorter.com (Harrison Designs) on my Rebel, and they lowered
my stall speed by about 10 mph, which surprised the heck out of me when I
did my first stall with them. No adverse handling effects and no change in
cruise speed. I didn't need them anywhere on the tail. I positioned mine at
10% chord and spaced them 3 inches apart.
On floats they did add more drag on my take-off (more lift = more drag, I
guess) if I started off with full flaps. As a result, I had to modify my
take-off technique to start with no flaps and then add full flaps after
building up some speed on the step, and then it pops right up.
I think an 0360 would help overcome that take-off drag, and could probably
utilize more float angle, too, with the VGs, to help further with the float
take-offs.
And not that a stock 0320 Rebel is any slouch on floats. But if you want the
ultimate...
Walter
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Bob
Patterson
Sent: Friday, January 26, 2007 3:23 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Rebel Questions: tail wrap; engine fit;
riveter modification, W&B
Hi Rick !
I agree with everybody ! :-) Leave the shot - but be careful on
that first flight ! You will likely find you can fly at very steep
<angles>
(nose up) - but speeds may not be too much different .... just be
careful, and get used to it "up high" ....
I wouldn't bother with VG's on the fin - the Rebel has LOTS of
rudder already, and you don't need the drag. If you want to try
VG's on the horiz. stab, be sure to put them on the BOTTOM,
in front of the hinge line. This way, they give a bit more effective
up elevator, for a nicer landing. I flew one where they were
incorrectly installed on top - just more drag !
If you decide to try them on the wings, use a removeable
adhesive first - positioning is critical, and i've flown one Rebel
where the VGs just ruined the handling qualities !! You might
want to chuck them !
Definitely do not add VGs until after you have tried it out
with the cuff .... one big change at a time is enough excitement !
Have fun on that first flight !! ..... and BE CAREFUL !!!! :-)
(NO spot landings .... ;-) )
--
......bobp
http://www.prosumers.ca
http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com
-------------------------------orig.-------------------------
On Friday 26 January 2007 22:00, Rick Harper wrote:
[quote]G'day Bob, Wayne, Ken & others !
just to put in our 2
http://www.stolspeed.com/content.php?id=5
I use the landshorter.com (Harrison Designs) on my Rebel, and they lowered
my stall speed by about 10 mph, which surprised the heck out of me when I
did my first stall with them. No adverse handling effects and no change in
cruise speed. I didn't need them anywhere on the tail. I positioned mine at
10% chord and spaced them 3 inches apart.
On floats they did add more drag on my take-off (more lift = more drag, I
guess) if I started off with full flaps. As a result, I had to modify my
take-off technique to start with no flaps and then add full flaps after
building up some speed on the step, and then it pops right up.
I think an 0360 would help overcome that take-off drag, and could probably
utilize more float angle, too, with the VGs, to help further with the float
take-offs.
And not that a stock 0320 Rebel is any slouch on floats. But if you want the
ultimate...
Walter
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Bob
Patterson
Sent: Friday, January 26, 2007 3:23 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Rebel Questions: tail wrap; engine fit;
riveter modification, W&B
Hi Rick !
I agree with everybody ! :-) Leave the shot - but be careful on
that first flight ! You will likely find you can fly at very steep
<angles>
(nose up) - but speeds may not be too much different .... just be
careful, and get used to it "up high" ....
I wouldn't bother with VG's on the fin - the Rebel has LOTS of
rudder already, and you don't need the drag. If you want to try
VG's on the horiz. stab, be sure to put them on the BOTTOM,
in front of the hinge line. This way, they give a bit more effective
up elevator, for a nicer landing. I flew one where they were
incorrectly installed on top - just more drag !
If you decide to try them on the wings, use a removeable
adhesive first - positioning is critical, and i've flown one Rebel
where the VGs just ruined the handling qualities !! You might
want to chuck them !
Definitely do not add VGs until after you have tried it out
with the cuff .... one big change at a time is enough excitement !
Have fun on that first flight !! ..... and BE CAREFUL !!!! :-)
(NO spot landings .... ;-) )
--
......bobp
http://www.prosumers.ca
http://bpatterson.qhealthbeauty.com
http://apatterson2.qhealthzone.com
-------------------------------orig.-------------------------
On Friday 26 January 2007 22:00, Rick Harper wrote:
[quote]G'day Bob, Wayne, Ken & others !
just to put in our 2