Some specs for J-3 Cubs with 3C-65 engineI acquired the following sheet when I had to make a weight & balance calculation for the Cub. I have tried to reproduce it as close to the original as possible.
A-691 - THE NEW PIPER AIRCRAFT, INC. Model J3C-65
October 1, 1997
The New Piper Aircraft, Inc.
2926 Piper Drive
Vero Beach, Florida 32960
IV. - Model J3C-65 (Army L-4, L-4A, L-4B (Navy NE-1), L-4H, L-4J (Navy NE-2)),2 POLM, Approved July 6,1939.
See NOTE 7 regarding conversion to 2 PCLM.
Army L-4 (previously Army 0-59) is the same as Model J3C-65. Army L-4A (previously Army 0-59A) and Army L-4B are the same as Model J3C-65 except for transparent turtledeck enclosure, revised rear seat with seat back belts, addition of rear shelf and rear floorboard. Army L-4H is same as L-4A except for G.F. radio equipment and revised method of installing the transparent cockpit enclosure. Army L-4J (Navy NE-2) same as any L-4, L-4A, L-4B and L-4H except for installation of propeller, Item 1.
Continental A-65-1 (See Item 311C for optional engines)
73 minimum octane aviation gasoline
For all operations, 2350 r.p.m. (65 hp)
Airspeed Limits (CAS)
Level flight or climb ... 90 mph ( 78 knots)
Glide or dive ... 122 mph (106 knots)
Static r.p.m. at maximum permissible throttle setting (No additional tolerance permitted):
(a) With A-65-1 engine: Not over 2300, not under 2000.
(b) With optional engines (Item 311C) and propeller Item 2 or 101:
Not over 2300, not under 1950.
Diameter: Not over 81 inches, not under 69.7 inches (with fixed pitch wood propeller).
Not over 74 inches, not under 72 inches (with propeller Item 2).
(+10.6) to (+22.7)
See NOTE 3 for restricted limits on certain Serial Nos. below 4502.
Empty Weight C.G. Range
If placard "Solo flying in rear seat only" is installed (See NOTE 2):
(+8.5) to (+20.3)
When empty weight C.G. falls within range given, computafion of critical fore and aft C.G. positions is unnecessary. Range is not valid for non-standard arrangements.
Serial Nos. 7842, 7845 through 7883, and 7912 and up are eligible for 1170 lb. These airplanes are also eligible for 1220 lb. maximum weight provided the landing gear is revised in accordance with Piper Dwgs. 31472 and 31423.
Serial Nos. prior to 7912, and not listed above, are eligible for 1100 lb. maximum weight. These airplanes are also eligible for 1170 lb. maximum weight provided the lift struts and attachments are revised in accordance with Piper Dwgs. No. 12352, 13233 and 21642 and for further increase to 1220 lb, upon revision of the landing gear in accordance with Piper Dwgs. No. 31472 and 31423.
Serial Nos. 10339 and up and 2356-A and up of Model J3C-65 eligible for 1220 lb. maximum weight.
Number of Seats
2 (one at +9 and one at +36)
20 lb. (+49)
12 gallons (-18)
1 gallon (-29)
Control Surface Movements