Hi Jim,
Before getting certified scales I've done a weights and balances using 3 bath
room scales.
Step 1: Calibrate the scales by getting a known weight and recording what the
scales read with known weights.
I used 4 plastic drums each with 20kg in them to record the weights
for 20, 40, 60 and 80 kg for each scale.
Step 2: Get the plan level in the flying attitude and weigh the aircraft (I
weighed it empty and with me in it so a got a semi accurate pilots arm length)
Step 3: Repeat step 2 twice more switching the scales around to confirm/average
your readings.
Setp 4: Using the readings for each wheel, correct values using the
calibrations, average them out and use the average values to calculate your C
of G.
Using the above method I got 0.2kg variance between scales when weighed on each
wheel.
SPECIAL NOTE: I made timber blocks with chocks to sit on the scales to ensure
the load was central and always in the same place.
I haven't yet confirmed my C of G with certified scales, I hope to do this soon.
Regards
Barry Kruyssen
Cairns, Australia
RAA 19-3873
[email protected]
http://users.tpg.com.au/barryk/KR2.htm
----- Original Message -----
From: JIM VANCE
To: krnet
Sent: Monday, December 13, 2004 9:04 PM
Subject: KR> Weight and Balance
I have a standard conventional geared KR-2 powered by a 1915 cc GP VW with a
rear drive. I have the battery mounted on the firewall at this time.
I'm ready to weigh it, and would like to have it close to the right c of g
before I rent the scales. Right now, when I bring the tail up to flight
attitude, I have almost no weight on the tail. Is this an indication that it
is nose heavy? Should I move the battery to behind the seats before I bother
with weighing?
I would appreciate input from those who have gone before.
Thanks.
Jim Vance
[email protected]
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