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  #1  
Old 03-11-2018, 06:04 AM
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uk_figs uk_figs is offline
 
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Default Flyboys Lighweight Tailwheel

My Vans stock tailwheel bearings have given up the ghost after 10 years and I am installing the Flyboys lightweight tailwheel on my -7 and wondered if anyone has already calculated the W&B impact? i.e over that long an arm is the weight difference significant enough to add to my baseline W&B formula and the aircraft logbook?
Figs
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  #2  
Old 03-11-2018, 06:48 AM
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Carlos151 Carlos151 is offline
 
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Talking Ounces

Talking just a few ounces less weight. Do you really want to drain your fuel tanks and put your airplane on a set of scales for this? A pair of travel chocks in your baggage compartment would have a bigger influence IMHO. If it makes you feel better then by all means change it out and weigh it. The rest of us will be flying that day.
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  #3  
Old 03-11-2018, 08:21 AM
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Ironflight Ironflight is offline
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Default

From a piloting standpoint, you won’t notice the difference. From a bookkeeping standpoint, measure it, weight the two wheels, do the calculation, and update the numbers so that you don’t get behind as you make changes to the airplane. Several years down the line, you’ll have made numerous small changes, and you’ll be far enough behind you’ll have to pull out the scales....which you might do anyway....
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  #4  
Old 03-11-2018, 08:49 AM
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DanH DanH is offline
 
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I second Paul. Weigh both tailwheel assemblies. From there it's just subtract a moment for the old one and add a moment for the new one.
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  #5  
Old 03-11-2018, 10:36 AM
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mfleming mfleming is offline
 
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Thumbs up I agree with Paul...

...just do the math and update the books. That's how its done in the certified world unless theres a major modification that needs re-weighing.

Here's a link to a weight and balance calculator for just about any RV
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Joseph, OR
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RV-7 Slider #74572
Started 11/2016
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Ailerons and flaps completed 3/2017.
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  #6  
Old 03-11-2018, 06:35 PM
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RV8JD RV8JD is offline
 
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Exclamation

Quote:
Originally Posted by mfleming View Post
Here's a link to a weight and balance calculator for just about any RV
I would caution anyone using someone else's W&B calculator to check it thoroughly before trusting it.

For example, on the RV-8 W&B program linked in the quoted post, I noticed a few things right off the bat after a quick cursory look.

1) It written for RV-8s with the "Dash-One" wing, which have a 1600 pound aerobatic GW. Aerobatic GW for RV-8s with the Non-"Dash-One" wing is 1550 pounds .

2) Each baggage area (Rear Floor, Rear Shelf, and Forward Baggage area) have their own weight limits (50, 25, and 50 pounds, respectively).

3) The RV-8 is stressed for Utility Category load factor limits between the Aerobatic gross weight (1550 or 1600 pounds, depending on the wing) and the Maximum gross weight (1800 pounds). The linked W&B calculator does not reflect this properly.

There may be other inaccuracies as well.
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Last edited by RV8JD : 03-11-2018 at 06:42 PM.
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  #7  
Old 03-11-2018, 09:55 PM
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mfleming mfleming is offline
 
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Default

Quote:
Originally Posted by RV8JD View Post
I would caution anyone using someone else's W&B calculator to check it thoroughly before trusting it.

For example, on the RV-8 W&B program linked in the quoted post, I noticed a few things right off the bat after a quick cursory look.

1) It written for RV-8s with the "Dash-One" wing, which have a 1600 pound aerobatic GW. Aerobatic GW for RV-8s with the Non-"Dash-One" wing is 1550 pounds .

2) Each baggage area (Rear Floor, Rear Shelf, and Forward Baggage area) have their own weight limits (50, 25, and 50 pounds, respectively).

3) The RV-8 is stressed for Utility Category load factor limits between the Aerobatic gross weight (1550 or 1600 pounds, depending on the wing) and the Maximum gross weight (1800 pounds). The linked W&B calculator does not reflect this properly.

There may be other inaccuracies as well.
Yes, your absolutely correct to be careful with any W&B sheet.
I should have put a disclaimer in my post (the W&B sheet isn't mine).


On the data sheet, the proper figures can be inputed with whatever figures one knows to be correct.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017 (sans fiberglass)
Started on QB fuselage 01/2018
Donated 2017
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  #8  
Old 03-27-2018, 05:44 PM
Rbb469 Rbb469 is offline
 
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Default Flyboys

Props to those guys! They truly know what customer service means, which has unfortunately faded in today’s times. They make a great product and have extremely fast shipping. I will definitely promote buy from these guys!
Ricky
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  #9  
Old 03-28-2018, 05:56 PM
49clipper 49clipper is offline
 
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Default 49clipper

since no one answered your question, I did the same change on my Stock O-320 powered -6 and it moved it .25" forward. Do the math like Dan said and log it. No job is done in aviation till the paperwork is done.
JS
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  #10  
Old 03-29-2018, 06:15 AM
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uk_figs uk_figs is offline
 
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Default Updated the W&B

I updated the W&B spreadsheet and the change is not insignificant as it is a 240 lb change due to the arm. In any -7 with a lightweight prop any positive CG impact helps
Thanks for the inputs.
Figs
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