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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Tue Jun 03, 2008 8:32 pm Post subject: 1/8 inch windshield |
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Today I removed an 1/8 inch windshield from a Tiger. It's the first thin windshield I''ve ever seen in an AA5x. THe one thing I noticed right off was how light it was. This one will need a weight and balance update.
Does anyone know what the weight is on a thin windshield? I'm assuming the 1/4 inch windshield is the one that shows up on all of the factory weight and balance lists.
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Gary
AuCountry Aviation
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jbowman90
Joined: 30 May 2008
Posts: 3
Location: Bellbrook, OH
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| Posted: Wed Jun 04, 2008 1:49 am Post subject: 1/8 inch windshield |
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| Quote: | Does anyone know what the weight is on a thin windshield? =C2-I'm assuming
the 1/4 inch windshield is the one that shows up on all of the factory weig
ht and balance lists.
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How thick is the thick one? 3/8", 1/2". I can't remember. The weight ratio
should be pretty close to the thickness ratio. I would think that's close
enough for weight and balance updates. I think the actual weight would be
higher than this estimation because I believe the thicker windshield adds
material to the inside dimension, which occupies a smaller volume. Or you can
stand on a bathroom scale with and without the windshield. The difference is
the weight of the windshield.
Jason
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flyv35b(at)minetfiber.com
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| Posted: Wed Jun 04, 2008 4:53 am Post subject: 1/8 inch windshield |
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I don't recall if the windshield is even on the equipment list. Compare an original equipment list for a 75 Tiger with one for a 77 or later and see if they are the same.
Cliff
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aa1bflyboy
Joined: 23 May 2008
Posts: 30
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| Posted: Wed Jun 04, 2008 5:35 am Post subject: 1/8 inch windshield |
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Gary, I don't recall what the numbers were exactly but LP Aero drop shoipped
the windshield and canopy I just had installed on my B model. Seems the two
and four place used different thicknesses. The two place were 1/8" and 3/16"
with the 1/8" being stock. I believe the four place numbers are 3/16 &
1/4... Call LP they have all the data. In fact in might even be on their
website, I forget.
We shall not cease from exploration.
And at the end of all our exploring
Will be to arrive were we started
And know the place for the first time - T. S. Eliot
Steve Roberts - AA-1B N641HY (at) ILG
----Original Message Follows----
From: teamgrumman(at)aol.com
Reply-To: teamgrumman-list(at)matronics.com
To: teamgrumman-list(at)matronics.com
Subject: 1/8 inch windshield
Date: Wed, 04 Jun 2008 00:30:13 -0400
Today I removed an 1/8 inch windshield from a Tiger. It's the first thin
windshield I''ve ever seen in an AA5x. THe one thing I noticed right off
was how light it was. This one will need a weight and balance update.
Does anyone know what the weight is on a thin windshield? I'm assuming the
1/4 inch windshield is the one that shows up on all of the factory weight
and balance lists.
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923te(at)att.net
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| Posted: Wed Jun 04, 2008 7:09 am Post subject: 1/8 inch windshield |
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Gary,
I think the 1/8" is around 4 to 6 lbs
One year at Oshkosh I ask the LP Aero guy who gave a talk at the AYA forum "Can you sell me a 1/8" thick windscreen for my Tiger?" He said he could only under the owner produced part regs....I ask how much it weighed and he gave me you're an idiot look and said 1/2 of what the 1/4" thick windscreeen weighs...
next time I'm at the hangar I'll weigh my old 1/4" windscreen and get back to you.
The number that I've heard is between 8 and 12 lbs so one would save 4 to 6 lbs.
I decided that the increased structural integrity was worth that weight and did not pursue the 1/8". I think the Tiger windscreen has a lot of stress on it when the canopy bow is used for egress and the thought of hitting a bird in the Sabertooth at 160kts with 1/8" makes me think the 1/4" might be the way to go
however, if it was an all out race plane 1/8" would be the way to go......
WHAT CONDITION WAS THE 1/8" THAT YOU REMOVED?
I could only find the specific gravity of the lexan which is 1.20. One could calculate the weight from that number....
LP Aero Tiger lexan
http://www.lpaero.com/cgi-bin/Mfr_Make_Model.asp?SubmitType=Last&Manuf=82&Make=Tiger&Model=AA%2D5B
Care of Lexan
http://www.lpaero.com/CAREINS.html
GE Tech sheet:
http://tws-plastics.com/technical-data/lexan9034.pdf
Interesting comment on allowable variation in thickness...this was mentioned to me by the LP Aero guy ....he said they get thin ones and thick ones and he could pick out a thin one for me....
Q. Is my 1/4" plastic really a 1/4" thick, and if not, how come?
A. It often depends on the type of plastic you buy. For example, most mechanical plastics like Delrin® and Nylon plate and rod are either planned or centerless ground to standard industry or ASTM tolerances. Most always, these materials will be oversize; -.000" / +.025", since the material will be machined down to the correct size. Some materials, are sold unplanned or ungrounded, or are molded and sold "as is". These products can be greatly oversize, and no specific stated tolerance exists other than the material is "sufficiently oversize to allow for machining."
In the case of acrylic (Plexiglas®) and polycarbonate (Lexan®, Tuffak®) sheet for example, these items are usually sold in "metric" gauges. For example, 6mm thickness acrylic sheet is sold as 1/4" thick material (the actual thickness is .236"). Other examples are listed below*: 1/10" = .098" thickness 1/8" = .118" thickness 3/16" = .177" thickness 7/32" = .220" thickness 1/4" = .250" thickness 3/8" = .354" thickness 1/2" = .472" thickness * The thickness above may also have a "tolerance-range" which may leave the sheets oversize or undersize.
from: http://www.modernplastics.com/techtalk.htm
[quote] Does anyone know what the weight is on a thin windshield? I'm assuming the 1/4 inch windshield is the one that shows up on all of the factory weight and balance lists.
[b]
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Wed Jun 04, 2008 11:10 am Post subject: 1/8 inch windshield |
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I have scales at the airport for weighing my new cowling. I hadn't thought about that. Missed that one entirely. If the weigh is half, that would be pretty significant. We'll see. Thanks
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Gary
AuCountry Aviation
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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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| Posted: Wed Jun 04, 2008 11:15 am Post subject: 1/8 inch windshield |
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The windshield I removed was in pretty bad shape. It's likely it was original. If not, it's been there a long time. For a race plane, that 4 to 6 lbs may be significant. Especially in climb.
Gary
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