Your RV-4 Empty Weight and Arm?

[seanRV8]

Just trying to get a feeling for an average EW and ARM for your RV-4’s if you’d care to share here.

[Scott Hersha]

EW: 981.2
CG: 69.50

O-360-A1A; Sensenich Carbon Fiber prop; fully painted and primed internally; Cloth seats; 2 screen VFR glass panel; Manual trim and flaps; Odyssey battery on the floor between the rudder pedals.

[rv8ch]

There's a DB here that has some RV-4s:

https://vansairforce.com/community/s...ad.php?t=73316

[n82rb]

O-360 metal hartzell constant speed, standard battery in standard location, vfr steam gauges, micro air radio and transponder. no paint all interior parts primed.

empty weight 995 lbs
empty cg 65.9 inches

bob burns
RV-4 N82RB

[pitts flyer]

RV-4, O-360, Catto 3 blade prop. Paint only on fiberglass parts and tailfeathers. 2 Lithium batteries.

Empty cg 69.5
Empty wt 924#

[vfrazier]

O-320-E2D; Sensenich GA Carbon Fiber prop; fully painted and primed internally; Cloth seats; 2 screen VFR glass panel; Manual trim and flaps; regular battery on the floor between the rudder pedals.

965 pounds and 59.8 arm..... NOTE: This would be a 69.8 arm using Van's current RV-4 60" from LE datum. Beware the comparisons unless you know all the facts.

Other thoughts.... having spent 35 years in lab and industry, I would be very, very skeptical of any scales that haven't been calibrated at a reasonably close weight to what you're weighing. For example, 26 years ago, this plane was weighed on bathroom scales and weighed 940 pounds. (I was poor in 1994 and calibrated scales were hard to come by!) The most recent W&B was after I'd removed the original steam gauges (some of which were radioactive), vacuum pump, and related hoses, filters, heavy tailwheel tire, etc. so the weight difference is probably even greater than it appears.

[Dayton Murdock]

WEIGHT & BALANCE DATA

Make: Van’s Aircraft
Model: RV4 Serial # 4354 Registration # N359DM

Datum= 60 inches forward of wing leading edge. (L.E.)
Design C.G. Range = 15% to 29% of wing chord, or 8.7” to 16.8 inches from L.E., or 68.7 to 77.4 inches aft of Datum.
Wing L.E. = 60”aft of datum.
Main wheel, right = 60”aft of datum.
Main wheel, left = 60.3”aft of datum.
Tail Wheel = 237.5”aft of datum.


Weight (lbs) Arm (ins) Moment (lbs. in)
Right Wheel 484 60 29040
Left Wheel 499 60.3 30089.7
Tail Wheel 50 237.5 11875
Total: 1036 70997.08

CG=70997.08/1036 / = Empty moment of aircraft 68.53” aft of datum

[daddyman]

Good question:
My total empty weight is 935.
I have IO-320 with constant speed Hartzell prop.
Been on a diet since I got it.
Process is: yank out everything you don't need.

Bought at 988lbs.

C.G 71.25 aft of datum.


Wish I could get/make a lightweight tail wheel.


Daddyman

[chrisbryanolsen]

O-360 with dual P-Mags, SkyTec 149NL starter
Whirlwind RV200 CS Prod
LifiPo4 battery
LED lights
Long Gear
Light Weight Tailwheel
Full paint / primer

Datum = 60 in forward LE
Empty: #992.4
Empty CG: 67.87

W/B spread sheet if interested: https://docs.google.com/spreadsheets...it?usp=sharing

[vfrazier]

Originally Posted by daddyman

Good question:
My total empty weight is 935.
I have IO-320 with constant speed Hartzell prop.
Been on a diet since I got it.
Process is: yank out everything you don't need.

Bought at 988lbs.

C.G 71.25 aft of datum.


Wish I could get/make a lightweight tail wheel.


Daddyman

Just contact my son, Blake, at www.flyboyaccessories.com