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Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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 Posted: Tue Jun 24, 2008 10:04 pm Post subject: UK Esqual pics |
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Well she flies, some stability issues and the trim is taking some time
to set up, I have the manual trim (no servo) and it's not simpler as I
hoped, also I have to add the tabs to the elevator as the plan is
unstable in pitch.
Aside from that the rest is good, a small list of snags but nothing that
can't be fixed. Off to the airfield with my bag of spanners.
Regards, Clive
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N1BZRich(at)aol.com
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| Posted: Wed Jun 25, 2008 3:59 am Post subject: UK Esqual pics |
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Congratulations, Clive.
Great looking photos. Does the manual trim system still use the bungees? If so, that is probably why you are having "some stability issues". The bungees make you think you have pitch stability issues because as you slow down the bungee pulling for up elevator becomes "more effective" as you have less airflow over the elevator. Makes the airplane continue to want to pitch up as you slow down. At cruise speeds you have very little need for trim because the bungees kind of keep things "in trim" but you often need to trim opposite to what you would expect - meaning slowing down may take down trim to maintain level flight instead of up trim and vice versa for speeding up. Unless the "test pilot" understands the above he will think the airplane is neutral to slightly unstable in pitch. So there is really just minor trim required during cruise speeds until you lower flaps. Then you will probably need full up trim because of the pitch down moment as the flaps go down. My other complaint with the bungee trim system is that you constantly have to adjust the tension on the bungees as any temperature change results in more or less elasticity in the bungee. Age changes the elasticity as well (the bungees age, not yours).
Again, congratulations on getting you airplane in the air. It looks great.
Blue Skies,
Buz
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
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pequeajim
Joined: 03 Sep 2006
Posts: 708
Location: New Holland, PA
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| Posted: Wed Jun 25, 2008 4:42 am Post subject: UK Esqual pics |
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Very nice Clive...
Can I post a couple of pictures of your airplane on my web site?
Jim!
On 6/25/08, N1BZRich(at)aol.com (N1BZRich(at)aol.com) <N1BZRich(at)aol.com (N1BZRich(at)aol.com)> wrote: [quote] Congratulations, Clive.
Great looking photos. Does the manual trim system still use the bungees? If so, that is probably why you are having "some stability issues". The bungees make you think you have pitch stability issues because as you slow down the bungee pulling for up elevator becomes "more effective" as you have less airflow over the elevator. Makes the airplane continue to want to pitch up as you slow down. At cruise speeds you have very little need for trim because the bungees kind of keep things "in trim" but you often need to trim opposite to what you would expect - meaning slowing down may take down trim to maintain level flight instead of up trim and vice versa for speeding up. Unless the "test pilot" understands the above he will think the airplane is neutral to slightly unstable in pitch. So there is really just minor trim required during cruise speeds until you lower flaps. Then you will probably need full up trim because of the pitch down moment as the flaps go down. My other complaint with the bungee trim system is that you constantly have to adjust the tension on the bungees as any temperature change results in more or less elasticity in the bungee. Age changes the elasticity as well (the bungees age, not yours).
Again, congratulations on getting you airplane in the air. It looks great.
Blue Skies,
Buz
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
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info(at)flylightning.net
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| Posted: Wed Jun 25, 2008 7:58 am Post subject: UK Esqual pics |
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Clive,
We have done many hours of flight testing with the esqual and lighting, with
both aircraft having either the bungee trim and the electric servo tab on
the elevator. I can tell you that if your cg is good (if you don't mind
sending your numbers) than the issue is certainly with the bungee and the
current trim. Like I said we have probably got 40-50 hours of flight testing
on this subject alone and it appears to be the bungee system. Take a look at
www.flylightning.net/Owners.htm and look at section 6 for flap and trim
motor install, note the section for the electric servo operated tab, this
will certainly make your aircraft feel and fly correctly.
Nick
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Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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| Posted: Wed Jun 25, 2008 11:34 am Post subject: UK Esqual pics |
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Sure Jim, sorry the flying pics are bit fuzzy, they were taken off a
video. The best picture I have is attached though I know she needs some
stripes.
Regards, Clive
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Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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| Posted: Wed Jun 25, 2008 12:23 pm Post subject: UK Esqual pics |
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Wow thanks Buz (and Nick), I was about ready to look for a length of
hemp (for me not the plane).
I fully understand what you are explaining. I was also compounding the
problem as I was tightening the system up so the 'more effective' bit
was getting worse and the stability was getting worse. In fact the
stability issue was only mentioned after I tightened the trim up.
Tomorrow we'll fly without trim and then only add what we need.
I will, for sure, be in the market for the RC Allen system. What's the
delivery?
Thanks for the help and the encouragement, Regards, Clive...... ))
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Colin K.
Joined: 04 Sep 2006
Posts: 157
Location: Oklahoma
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| Posted: Wed Jun 25, 2008 3:33 pm Post subject: UK Esqual pics |
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Congratulations Clive. It's been a long road!
Colin K.
OK
Lightning # 52 under construction.
http://www.mykitlog.com/cojaken
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Colin K.
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pequeajim
Joined: 03 Sep 2006
Posts: 708
Location: New Holland, PA
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| Posted: Wed Jun 25, 2008 4:59 pm Post subject: UK Esqual pics |
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That will work fine, thanks!
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