CB-1 weight and balance info needed

A forum about all aspects of the construction and maintenance of the original Hatz CB-1 biplane. Here is the place to ask your questions and get the answers from the real experts.
Ben R
Posts: 2
Joined: Mon Mar 31, 2014 2:26 pm

CB-1 weight and balance info needed

Post by Ben R »

Hello all,
I'm trying to help a friend who just purchased a CB-1. The weight and balance for the plane was lost and we are trying to create a new one. Any info on the weighing procedure, C.G. limits, or a sample weight and balance would be greatly appreciated!
Thanks,
Ben
rumbley1@yahoo.com
M Lightsey
Posts: 112
Joined: Tue Jun 15, 2010 3:10 pm

Re: CB-1 weight and balance info needed

Post by M Lightsey »

Here are the figures for NX1279 level using the lower wing l/e as the datum.
Right main 447 lbs @ -14.25"
Left main 457 lbs @ -14.25"
T/w 48 lbs @ 152.5"
Stagger 24"
L/E of MAC -13.2" (.55 x -24")
C/P limits of 18%-33% MAC = -4.2" to +3.3"
Arms:
Fuel -4.25"
Passenger -4.0"
Pilot 30.25"
Baggage 57.5"

Mark
You do not have the required permissions to view the files attached to this post.
Meadowlark
Posts: 15
Joined: Sat Jul 31, 2010 7:15 am

Re: CB-1 weight and balance info needed

Post by Meadowlark »

What is the distance from the datum to your prop flange?
Ben R
Posts: 2
Joined: Mon Mar 31, 2014 2:26 pm

Re: CB-1 weight and balance info needed

Post by Ben R »

Thanks for the reply and info Mark! What did you use as a leveling point? We were thinking the upper longeron.

Ben
M Lightsey
Posts: 112
Joined: Tue Jun 15, 2010 3:10 pm

Re: CB-1 weight and balance info needed

Post by M Lightsey »

The upper longerons were used for the leveling points. I don't know the distance from the datum to the prop flange. It wasn't a dimension required for the calculations, so we didn't measure it.
Mark
User avatar
rawheels
Posts: 76
Joined: Thu Aug 12, 2010 1:40 pm
Location: Westfield, IN
Contact:

Re: CB-1 weight and balance info needed

Post by rawheels »

Here is the info that I used to create the W&B for our Hatz: http://www.hatzbiplane.com/BratzCG.html

I've also attached a xls file that I used for a while to plot our W&B.
You do not have the required permissions to view the files attached to this post.
Meadowlark
Posts: 15
Joined: Sat Jul 31, 2010 7:15 am

Re: CB-1 weight and balance info needed

Post by Meadowlark »

Mark…… Would it be too much to ask that next time you are near your Hatz, please take a tape measure and find out what the measurement is from the prop flange to the datum? I don't need a precise measurement from leveled aircraft……. Just a measurement.

Please……. Thank you.

J/C GTF
M Lightsey
Posts: 112
Joined: Tue Jun 15, 2010 3:10 pm

Re: CB-1 weight and balance info needed

Post by M Lightsey »

It's about 66 1/2" from the leading edge of the lower wing to the front of my prop flange.
Mark
Meadowlark
Posts: 15
Joined: Sat Jul 31, 2010 7:15 am

Re: CB-1 weight and balance info needed

Post by Meadowlark »

Thank You
Post Reply