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Flight test results

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dashvii(at)hotmail.com
Guest

Posted: Thu May 24, 2007 3:56 pm Post subject: Flight test results

Well, after doing some preliminary work on my gap seal project I'm starting 

to see some interesting results.  After working out the data for the stall 

speed tests I can report that 323AL stalled at exactly 44.2 knots with or 

without gap seals in the clean configuration.   This is as I predicted since 

there's really no slot when the flaps are retracted.  We couldn't do the 

Flaps 30 b/c of how I designed the gap seals.  Mine overlapped the flap and 

would beat against it with flaps down.  Sounded like a 727 thrust reverser 

and we were uncomfortable as to what that might be doing to the airplane.  I 

can tell you that it should go up a couple of knots with flaps all the way 

down.  I can tell you that the cruise speed from Alpha Lima went up by 

between 4-6 knots true airspeed at 2850 RPM.  We ran at about 133 KTAS or 

about 154 mph.  Nick tells me that with a different prop and once they get 

the jetting right with a prop it'll be a higher cruise speed.  The max speed 

is a little confusing to me.  We got slower max speed during the gap seal 

tests.  I can tell you that for some reason the engine was turning about 200 

rpm's less per data point than the unmodified condition.  The temp was 

warmer on the unmodified than the modified condition.  I can't really 

explain why the data come out like that.  We got a max speed at 145 KTAS or 

almost 170mph at about a 7,400 foot density altitude, but that was at only 

3160 RPM's not the 3300 rpm that the engine is capable of with the right 

prop pitch setup.  Now on to the climb and glide stuff.  Hopefully I'll see 

something interesting there too.  Enjoy, Brian W.



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EAFerguson(at)AOL.COM
Guest

Posted: Thu May 24, 2007 6:27 pm Post subject: Flight test results

Brian - and everybody else,

  

 Results sound great to me! I was concerned about the possibility of  increased stall speed since I'm flying Light Sport, but that isn't a problem. If  I can get +2 or 3K at 2750 it would be great, and I'll still be LSA legal. That  might just eliminate one fuel stop on my coast to coast record run. It will  surely increase my max range and give me more margin on the long  legs.

  

 So - - What do I have to do to be able to install the gap seals? 

  

 I will need to get a weight for the materials since I'm bumping the 500 kg  limit now. 

  

 Earl Ferguson

 N17EF



See what's free at AOL.com. 

  [quote][b]

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dashvii(at)hotmail.com
Guest

Posted: Fri May 25, 2007 5:45 am Post subject: Flight test results

Earl,

   There were two types of gap seals that I applied.  The wider (6 inch?) 

and the not so wide 2 inch duralar.  I attached it simply by measuring the 

gaps, then using carpet tape, available at any walmart.  I then added speed 

tape on top of that just to make sure that it stuck, but I think it would've 

been fine without that.  the widest strips went over the flaps and underside 

of the aileron.  The other went on the top of the ailerons and the bottom of 

the elevator.  I also had rub strips so that they wouldn't scuff the paint 

on things like ailerons and elevator.  I bet that you wouldn't add any more 

than a pound, but I think that you'll just need to get the supplies together 

and weigh it.  We had to leave flaps up in our design, but if you took and 

just covered the flap gap, leaving a small hole as to not touch the flap in 

the raised position then I think you'd get the benefit plus the use of your 

flaps.  This is bound to do something for your fuel consumption, however we 

did not test for that.  The climb and glide should both go up, but I haven't 

worked through all of that yet.  When I do, I'll post the results.  Faster 

climbs mean that you get to altitude quicker and burn less fuel at altitude. 

  This sounds like it'd be perfect for your record attempt.  Brian W.

From: EAFerguson(at)aol.com

Reply-To: lightning-list(at)matronics.com

To: lightning-list(at)matronics.com

Subject: Re: Flight test results

Date: Thu, 24 May 2007 22:27:05 EDT



Brian - and everybody else,



Results sound great to me! I was concerned about the possibility of

increased stall speed since I'm flying Light Sport, but that isn't a 

problem. If  I

can get +2 or 3K at 2750 it would be great, and I'll still be LSA legal. 

That

might just eliminate one fuel stop on my coast to coast record run. It will

surely increase my max range and give me more margin on the long  legs.



So - - What do I have to do to be able to install the gap seals?



I will need to get a weight for the materials since I'm bumping the 500 kg

limit now.



Earl Ferguson

N17EF



************************************** See what's free at 

http://www.aol.com.



_________________________________________________________________

PC Magazine’s 2007 editors’ choice for best Web mail—award-winning Windows 

Live Hotmail.

- The Matronics Lightning-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Lightning-List

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