Today's Message Index:
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1. 09:20 AM - trim system (Tex Mantell)
2. 09:24 AM - trim question #2 (Tex Mantell)
3. 09:39 AM - Re: trim system (Brian Whittingham)
4. 02:02 PM - Re: trim system (N1BZRich@aol.com)
5. 02:10 PM - Re: trim system (N1BZRich@aol.com)
Message 1
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Buz, very interested in the trim system. I would like to know what the
square inches of the tab is, and what about cutting out the elevator
and making a normal type tab? Would take some work, but would look real
nice. When you get a chance to fly the new set up, see if you can over
ride full up trim with the stick. This is a major problem with the RV's.
A run away trim and your in the toilet. Tex
Message 2
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| Subject: | trim question #2 |
Buz, also when you see the new trim system, see if they are still using
the bungees as a counter balance on the elevator. Tex
Message 3
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Tex,
I believe that Nick already said that he could easily override the full
trim with stick forces. I'm sure it would wear you out more, but in a ligh
t aircraft it's generally pretty easy to overcome. It shouldn't be too har
d to wire a trim disconnect though. Flying Piper Seminoles and Arrows we a
lways had a trim cutout switch and had to use it quiet often in one aircraf
t in particular! I think that adding a new trim system though will make th
is aircraft even more appealing to the masses. I personally liked the sens
itive and quick trim of the old system, but I can see where a lot of pilots
might want a stable, quick, and cheap cross country plane and would want a
more conventional system. The best thing is that it is adding a little co
mplexity, but is decreasing maintenance on the system. Brian W.
From: wb2ssj@earthlink.netTo: Lightning-list@matronics.comSubject: Lightnin
g-List: trim systemDate: Sat, 22 Mar 2008 12:17:41 -0400
Buz, very interested in the trim system. I would like to know what the squa
re inches of the tab is, and what about cutting out the elevator and makin
g a normal type tab? Would take some work, but would look real nice. When y
ou get a chance to fly the new set up, see if you can over ride full up tri
m with the stick. This is a major problem with the RV's. A run away trim an
d your in the toilet. Tex
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Message 4
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In a message dated 3/22/2008 12:22:07 P.M. Eastern Daylight Time,
wb2ssj@earthlink.net writes:
I would like to know what the square inches of the tab is
Tex,
I will have to measure it for you tomorrow as I am back in the motel
after flying three flights today - one in the prototype and two in 31BZ
evaluating a new prop. Also flew the prototype yesterday and it only took that
one
flight to decide that Nick has hit another home run. The new trim system is
definitely the way to go. It is better in all flight conditions and provides
accurate feed back. Nick has already made the tab on the new Demo larger by
2 square inches. The reason for the increase is to provide more nose up trim
when very slow or when the flaps are down. I did quite a bit of checking
that yesterday and found that full nose up trim is "trimmed flight" for 20
degrees of flaps at 80 mph, 10 degrees of flaps is good to 70, and no flaps is
good down to 60 mph. So you can see that putting the flaps down will require
a
larger tab to be able to trim the forces off when using the flaps.
Tomorrow or Monday I will add some area to the prototype's tab and see how much
better that will be.
Nick's plan all along has been to make the tab integral to the elevator
itself like you described. But he is doing it the smart way by using a
separate tab first until we determine the total area of tab that will be needed.
Doing it this way allows us to add or subtract area as called for by the test
flights. Once Nick knows the size, then it will be cut out of the elevator.
To answer your other questions, yes you can over ride full up or full
down trim tab travel. The amount of stick force required to do this obviously
depends on your speed - note the numbers above talking about full up trim
travel and the speeds and conditions that they have the airplane trimmed at.
And No bungees are used with the new system - Yeah, I like that. Those things
are a nuisance. I now have 431.6 hours on 31BZ now and I can't begin to tell
you how many times I have adjusted them. And when you do get them adjusted
it will change with the weather, the temperature, and which Thursday of the
month it is. Heck, might even have to do with a person's "white count".
Hope this helps,
Buz
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Message 5
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In a message dated 3/22/2008 12:40:15 P.M. Eastern Daylight Time,
dashvii@hotmail.com writes:
It shouldn't be too hard to wire a trim disconnect though.
Brian, I will have to ask Nick where on the Lightning's electrical system he
got the electrical power for the Ray Allen trim servo. Might also be good
to know the mean time between failure for these units as well. But as you
say, it should be easy to isolate the circuit and "kill it" by pulling a circuit
breaker or have the circuit "switched".
Buz
**************Create a Home Theater Like the Pros. Watch the video on AOL
Home.
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