Home -> RV-7 and RV-7A topic: weight and balance

Author: "Dan Checkoway" <dan@...> Time: Thu Mar 11, 2004 2:54 pm PST Link

A zillion people have been asking how much my plane weighs...1132 empty
(includes 8 qts. oil, zero fuel). I heard from Van's that they had a pool
going...one guess was 1187...nope, too high. 8^) I consider 1132 on the
heavy side as it is!

No matter what loading I throw at it, I can't get the CG out of range. I
attribute the relatively forward empty CG to:

- heavier engine (200hp IO-360-A1B6)
- counterweighted crankshaft
- honker of a prop (Hartzell C2YK-1BF/F7666A4)
- ram air system that definitely adds weight
- not priming skins (most of which are aft of the CG)
- no autopilot installed (no servos aft of CG)

Who knows. Anyway, my weight and balance data is here:
http://www.rvproject.com/weight_and_balance.xls I almost hesitate to make
it public, but I had an example to work from when I did mine, and it
simplified the process.

Hope this helps,
)_( Dan
RV-7 N714D (killing time at this point)
http://www.rvproject.com


Author: "Bob Collins" <bcollins@...> Time: Thu Mar 11, 2004 3:52 pm PST Link

You know, Dan, considering that you've practically put together the
definitive assembly manual for Van's Aircraft and, no doubt, saved
that company thousands of dollars in staff time to answer questions
from us builders, they should send you a nice big gift certificate
for your RV-10 kit.

Bob
St. Paul

--- In RV7and7A@yahoogroups.com, "Dan Checkoway" <dan@r...> wrote:
> A zillion people have been asking how much my plane weighs...1132
empty
> (includes 8 qts. oil, zero fuel). I heard from Van's that they had
a pool
> going...one guess was 1187...nope, too high. 8^) I consider 1132
on the
> heavy side as it is!
>
> No matter what loading I throw at it, I can't get the CG out of
range. I
> attribute the relatively forward empty CG to:
>
> - heavier engine (200hp IO-360-A1B6)
> - counterweighted crankshaft
> - honker of a prop (Hartzell C2YK-1BF/F7666A4)
> - ram air system that definitely adds weight
> - not priming skins (most of which are aft of the CG)
> - no autopilot installed (no servos aft of CG)
>
> Who knows. Anyway, my weight and balance data is here:
> http://www.rvproject.com/weight_and_balance.xls I almost hesitate
to make
> it public, but I had an example to work from when I did mine, and it
> simplified the process.
>
> Hope this helps,
> )_( Dan
> RV-7 N714D (killing time at this point)
> http://www.rvproject.com


Author: "Dan Checkoway" <dan@...> Time: Thu Mar 11, 2004 6:08 pm PST Link

Thanks...Van's sends me checks from time to time for the finder's fee, so I
can't complain (I wouldn't complain much anyway!).

Here's an even better version of the W&B...it's an interactive web form.
Feel free to steal this HTML file and tweak it according to your own
aircraft. http://www.rvproject.com/wab.html

It's easier to use than excel...because you can use it from anywhere with
web access. I'll have the WAP (mobile phone) version up and running soon.

)_( Dan

----- Original Message -----
From: "Bob Collins" <bcollins@...>
To: <RV7and7A@yahoogroups.com>
Sent: Thursday, March 11, 2004 2:56 PM
Subject: [RV7Yahoo] Re: weight and balance

> You know, Dan, considering that you've practically put together the
> definitive assembly manual for Van's Aircraft and, no doubt, saved
> that company thousands of dollars in staff time to answer questions
> from us builders, they should send you a nice big gift certificate
> for your RV-10 kit.
>
> Bob
> St. Paul
>
> --- In RV7and7A@yahoogroups.com, "Dan Checkoway" <dan@r...> wrote:
> > A zillion people have been asking how much my plane weighs...1132
> empty
> > (includes 8 qts. oil, zero fuel). I heard from Van's that they had
> a pool
> > going...one guess was 1187...nope, too high. 8^) I consider 1132
> on the
> > heavy side as it is!
> >
> > No matter what loading I throw at it, I can't get the CG out of
> range. I
> > attribute the relatively forward empty CG to:
> >
> > - heavier engine (200hp IO-360-A1B6)
> > - counterweighted crankshaft
> > - honker of a prop (Hartzell C2YK-1BF/F7666A4)
> > - ram air system that definitely adds weight
> > - not priming skins (most of which are aft of the CG)
> > - no autopilot installed (no servos aft of CG)
> >
> > Who knows. Anyway, my weight and balance data is here:
> > http://www.rvproject.com/weight_and_balance.xls I almost hesitate
> to make
> > it public, but I had an example to work from when I did mine, and it
> > simplified the process.
> >
> > Hope this helps,
> > )_( Dan
> > RV-7 N714D (killing time at this point)
> > http://www.rvproject.com

> Van's Air Force - World Wide Wing
> www.vansaircraft.net

> Yahoo! Groups Links


Author: "Richard & Roberta Hegy" <rhegy@...> Time: Thu Mar 11, 2004 6:08 pm PST Link

Dan,

Did you include the wheel pants and leg fairings in your W&B? What about allowance for paint?

Roberta
----- Original Message -----
From: Dan Checkoway
To: RV7and7A@yahoogroups.com ; RV7or7A@yahoogroups.com
Sent: Thursday, March 11, 2004 4:13 PM
Subject: [RV7Yahoo] weight and balance

A zillion people have been asking how much my plane weighs...1132 empty
(includes 8 qts. oil, zero fuel). I heard from Van's that they had a pool
going...one guess was 1187...nope, too high. 8^) I consider 1132 on the
heavy side as it is!

No matter what loading I throw at it, I can't get the CG out of range. I
attribute the relatively forward empty CG to:

- heavier engine (200hp IO-360-A1B6)
- counterweighted crankshaft
- honker of a prop (Hartzell C2YK-1BF/F7666A4)
- ram air system that definitely adds weight
- not priming skins (most of which are aft of the CG)
- no autopilot installed (no servos aft of CG)

Who knows. Anyway, my weight and balance data is here:
http://www.rvproject.com/weight_and_balance.xls I almost hesitate to make
it public, but I had an example to work from when I did mine, and it
simplified the process.

Hope this helps,
)_( Dan
RV-7 N714D (killing time at this point)
http://www.rvproject.com

Van's Air Force - World Wide Wing
www.vansaircraft.net

Yahoo! Groups Sponsor
ADVERTISEMENT

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Author: "Dan Checkoway" <dan@...> Time: Thu Mar 11, 2004 7:04 pm PST Link

Yep. I included the pants & leg fairings mathematically...since they sit
right over each wheel. I just weighed me on a scale, then me + pants +
fairings to get their weight.

No paint allowance...I'll re-weigh the plane after paint. May as well,
since I own the scales now. I'm not planning on painting for a LOOONG time
(so I don't want 50,000 emails asking me about it!). 8^)

)_( Dan

----- Original Message -----
From: "Richard & Roberta Hegy" <rhegy@...>
To: <RV7and7A@yahoogroups.com>
Sent: Thursday, March 11, 2004 5:35 PM
Subject: Re: [RV7Yahoo] weight and balance

> Dan,
>
> Did you include the wheel pants and leg fairings in your W&B? What about
allowance for paint?
>
> Roberta
> ----- Original Message -----
> From: Dan Checkoway
> To: RV7and7A@yahoogroups.com ; RV7or7A@yahoogroups.com
> Sent: Thursday, March 11, 2004 4:13 PM
> Subject: [RV7Yahoo] weight and balance

> A zillion people have been asking how much my plane weighs...1132 empty
> (includes 8 qts. oil, zero fuel). I heard from Van's that they had a
pool
> going...one guess was 1187...nope, too high. 8^) I consider 1132 on
the
> heavy side as it is!
>
> No matter what loading I throw at it, I can't get the CG out of range.
I
> attribute the relatively forward empty CG to:
>
> - heavier engine (200hp IO-360-A1B6)
> - counterweighted crankshaft
> - honker of a prop (Hartzell C2YK-1BF/F7666A4)
> - ram air system that definitely adds weight
> - not priming skins (most of which are aft of the CG)
> - no autopilot installed (no servos aft of CG)
>
> Who knows. Anyway, my weight and balance data is here:
> http://www.rvproject.com/weight_and_balance.xls I almost hesitate to
make
> it public, but I had an example to work from when I did mine, and it
> simplified the process.
>
> Hope this helps,
> )_( Dan
> RV-7 N714D (killing time at this point)
> http://www.rvproject.com

> Van's Air Force - World Wide Wing
> www.vansaircraft.net

> Yahoo! Groups Sponsor
> ADVERTISEMENT

> --------------------------------------------------------------------------
----
> Yahoo! Groups Links
>
> a.. To visit your group on the web, go to:
> http://groups.yahoo.com/group/RV7and7A/
>
> b.. To unsubscribe from this group, send an email to:
> RV7and7A-unsubscribe@yahoogroups.com
>
> c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.

> [Non-text portions of this message have been removed]

> Van's Air Force - World Wide Wing
> www.vansaircraft.net

> Yahoo! Groups Links


Author: "David Domeier" <davidd010@...> Time: Sun Mar 14, 2004 8:17 am PST Link

Dan,

You've raised the max gross weight your RV-7 from Van's 1800
to 1950, which of course is a builders prerogative.

Just wondering, why did you do it? At that weight, the structural
limits of the airplane are unkown.

Thanks for posting the spread sheet. I like it.

dd
RV-7


Author: "Dan Checkoway" <dan@...> Time: Sun Mar 14, 2004 3:20 pm PST Link

It's purely a legal CYA maneuver. Let's say you set your gross weight at
1800, and then you get ramp checked someday...and you happened to be
slightly over.

I have no intention of loading the aircraft beyond Van's design limits. I'm
a believer that the landing gear is the "first to go" in terms of
overloading damage potential, and that as long as (a) the CG is within
limits, and (b) the airframe isn't subjected to a load factor beyond what
the design prescribes, then it should be business as usual.

What I'm saying is that even if you happened to have 1950 pounds in the
plane...

1800 x 6g = 10800
1950 x ?g = 10800... max G at 1950lbs = 5.5

See what I'm getting at? Everybody needs to come to their own conclusions
here, but that's my perspective (for whatever it's worth).

)_( Dan

----- Original Message -----
From: "David Domeier" <davidd010@...>
To: <RV7and7A@yahoogroups.com>
Sent: Sunday, March 14, 2004 7:52 AM
Subject: [RV7Yahoo] Re: weight and balance

> Dan,
>
> You've raised the max gross weight your RV-7 from Van's 1800
> to 1950, which of course is a builders prerogative.
>
> Just wondering, why did you do it? At that weight, the structural
> limits of the airplane are unkown.
>
> Thanks for posting the spread sheet. I like it.
>
> dd
> RV-7

> Van's Air Force - World Wide Wing
> www.vansaircraft.net

> Yahoo! Groups Links


Author: Neil McLeod <bedrock@...> Time: Mon Mar 15, 2004 2:57 am PST Link

Slight correction, the maximum "aerobatic" ie. 6g weight of the RV7 is listed in my plans at 1600 lbs. Sorry to be picky Dan your info is usually right on but this could make a difference to somebody.

Neil
----- Original Message -----
From: Dan Checkoway
To: RV7and7A@yahoogroups.com
Sent: Sunday, March 14, 2004 3:56 PM
Subject: Re: [RV7Yahoo] Re: weight and balance

It's purely a legal CYA maneuver. Let's say you set your gross weight at
1800, and then you get ramp checked someday...and you happened to be
slightly over.

I have no intention of loading the aircraft beyond Van's design limits. I'm
a believer that the landing gear is the "first to go" in terms of
overloading damage potential, and that as long as (a) the CG is within
limits, and (b) the airframe isn't subjected to a load factor beyond what
the design prescribes, then it should be business as usual.

What I'm saying is that even if you happened to have 1950 pounds in the
plane...

1800 x 6g = 10800
1950 x ?g = 10800... max G at 1950lbs = 5.5

See what I'm getting at? Everybody needs to come to their own conclusions
here, but that's my perspective (for whatever it's worth).

)_( Dan

----- Original Message -----
From: "David Domeier" <davidd010@...>
To: <RV7and7A@yahoogroups.com>
Sent: Sunday, March 14, 2004 7:52 AM
Subject: [RV7Yahoo] Re: weight and balance

> Dan,
>
> You've raised the max gross weight your RV-7 from Van's 1800
> to 1950, which of course is a builders prerogative.
>
> Just wondering, why did you do it? At that weight, the structural
> limits of the airplane are unkown.
>
> Thanks for posting the spread sheet. I like it.
>
> dd
> RV-7

> Van's Air Force - World Wide Wing
> www.vansaircraft.net

> Yahoo! Groups Links

Van's Air Force - World Wide Wing
www.vansaircraft.net

------------------------------------------------------------------------------
Yahoo! Groups Links

a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/RV7and7A/

b.. To unsubscribe from this group, send an email to:
RV7and7A-unsubscribe@yahoogroups.com

c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

[Non-text portions of this message have been removed]


Author: "Richard & Roberta Hegy" <rhegy@...> Time: Thu Mar 25, 2004 7:42 pm PST Link

Just finished our W&B on our FINISHED RV-7A!!!!! Numbers look GREAT!!!. 1117 EW with a 77.19" EWCG. Every load scenario falls well within the envelope. The plane is complete with paint, interior, and full gyro panel with avionics. I weighed the pants and added extra for paint and finish of them. I have a Lyc. 0-360 A1A with Hartzell C/S prop.

Photos attached/and/or posted.

Roberta

[Non-text portions of this message have been removed]



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