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Old Jan 10, 2012, 07:43 AM
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Quote:
Originally Posted by phil alvirez View Post
ungn is talking about 6400T.
what he says makes sense:

i just checked 6400L, which has a little bit longer servos: 4.92

and just in case, i checked weights of the original 6400: 3.90

by the way, the brick on the champ weighs the same: 3.90-although it is de-tuned to develop less power, as confirmed by horizon.
i did bench tests on both (detailed figures somewhere in my blog).
Phil, your scale is off.

Depending on the wire length, a Champ/J-3/PKZ3351 brick weighs between 3.60 and 3.75.

The difference between it and the AR6400 and the Champ brick are the 3 plugs soldered to it.

The AR6400L weight listed is correct.

I have a couple nib, one weighs 4.21g, the other 4.23g.

Also, the T has the longer servos of the L, so Horizon should have named it LT.
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Old Jan 10, 2012, 01:38 PM
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checking weights again


Quote:
Originally Posted by UNGN View Post
Phil, your scale is off.

Depending on the wire length, a Champ/J-3/PKZ3351 brick weighs between 3.60 and 3.75.

The difference between it and the AR6400 and the Champ brick are the 3 plugs soldered to it.

The AR6400L weight listed is correct.

I have a couple nib, one weighs 4.21g, the other 4.23g.

Also, the T has the longer servos of the L, so Horizon should have named it LT.
ok. it is not the scale. i checked again-several times-and got this:
champ brick: 3.90
original 6400 brick: 3.90
longer servos 6400: 4.08
all same wire lenght.
so, i don't know if there are variations of those models. sometimes during manufacturing they just change something and don't tell. but again, these are the weights i got.
the 4.96 i had was with an extra connector that i overlooked when weighing. i already corrected it on the post.
Old Jan 10, 2012, 02:01 PM
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Are we all agreeing on weights now?
Old Jan 11, 2012, 03:01 PM
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plank n shankbone pilot
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Spek AR6400LBL 7.8g
TechOne C05 3400kv motor for 2s 5.5g
ThunderPower 1s160mah 5.0g
Last edited by red_z06; Jan 17, 2012 at 06:22 PM.
Old Jan 15, 2012, 04:39 AM
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carbon fiber rods


1 meter long (40 in.):
0.5mm---0.36 grams---(0.009 grams/inch)
0.6mm---0.42-----------(0.011 " )
0.8-------0.80-----------(0.020)
1.0-------1.25-----------(0.030)
1.5-------2.90-----------(0.074)
Last edited by phil alvirez; Jan 15, 2012 at 04:45 AM.
Old Jan 15, 2012, 12:02 PM
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fiberglass cloth


ultra-thin fiberglass cloth 18 grams per sq meter (PRODUCT ID: GF-003MQS)
(ideal for lightweight reinforcements with epoxy or whatever) found it here:
http://www.hobbyking.com/hobbyking/s...dProduct=10905
Old Jan 16, 2012, 01:22 PM
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carbon fiber veil


carbon fiber veil: 6.7 gr/sq meter

aka mat, tissue, from cst, about $16
on post 9, Andy asks for use of this: for cowlings or nose cones, i carve the piece from soft foam, cover it with saran wrap, epoxy, then the cf, and saran wrap again,well stretched. when cured, remove the wrap and add microbaloons mixed with epoxy. let cure, sand and cover with shrink covering or paint. remove from the core. look at my stick and tissue models on my blog-somewhere on page 2 or 3.
Last edited by phil alvirez; Jan 19, 2012 at 12:34 AM.
Old Jan 16, 2012, 01:32 PM
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Some foam weights I just measured:

Selitac 1 mm 80 gm/m^2

Selitac 2 mm 81 gm/m^2

Proformance 1 mm 58 gm/m^2

Now, the 2 Selitac samples were both quite inaccurate in thickness, being 1.67mm and 2.77 mm, respectively. Obviously, the "closeness" in my density calculations is due to differences in the absolute densities of the differing batches they came from. My scale is accurate to 0.01 gm, less than 0.25% of the weights measured. (My Ohaus calibration weights are accurate to 0.04% at 5 gms (ASTM Class 6, e.g., 2 mg/5gm).
Old Jan 18, 2012, 10:14 AM
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EPP foam, white


1.3 density:
6mm: 124 (g/sq meter) >>>(this 1 is shown on page 2 but with no density)
9mm: 183

1.9 density:
6mm: 183
9mm: 275
Old Jan 26, 2012, 04:55 AM
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esaki black tissue, pre tusnami. 3.4g a sheet (17.5 X 23.5)
or 1.19 gram/square foot
Old Feb 25, 2012, 09:29 PM
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I think the hk-5320 is mislabeled as a 5230 in the original post.
Old Feb 26, 2012, 05:22 PM
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Fixed
Old Feb 29, 2012, 01:06 AM
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Dollar tree foam board without paper: 76.90 g/m2
With paper: 34.91 g/m2
Old Feb 29, 2012, 01:41 AM
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I assume that you have that backwards.
Old Feb 29, 2012, 02:20 AM
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Oops! Yep that's backwards.


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