Adams Aeronautics Company, Inc. acquired the CA-2 design rights back in May of 2011 and we have invested a tremendous amount of time, money and effort in supporting this design and the current and previous plans owners and builders. We are the sole source for plans and support for this aircraft and the only owners of this design. If you find the Adams CA-2 or "Hummel CA-2" plans for sale anywhere else besides our website, or a personal sale of one's plans, this person or persons has pirated our intellectual property. Please help us to be able to continue providing a superior Adams CA-2 plans set and customer support by not supporting this type of illegal behavior.
We will only support plans that have been previously sold by Frank Griffith the CA-2 designer, or plans previously sold by Hummel Aviation, and of course, the Adams CA-2 serial numbers. We no longer support plans set #0029 at this point. This set of plans has been copied and sold over and over again countless times and we have had many individuals contact us for support with “plans set #29.” There is an actual CA-2 aircraft that has been built and flown with S# 0029 and this is the only set of plans with that serial number that is recognized to be the official set of S# 0029 plans. If you have a S# 0029 set of CA-2 plans you have been sold or given an illegal copy of our CA-2 plans and your set of plans will not be supported. Thank you for your understanding of this situation and for your support.
The CA-2 plans consist of 40 pages of CAD drawn 11" x 17" sheets, a 74 page construction manual, and a full size airfoil drawing. We redrew the optional, Hummel Aviation hand drawings that Morrey Hummel created and added them to the construction manual so they are no longer an optional set of plans. Here is what we added as standard to the plans set rather than optional:
Stick assembly for CA-2 with lowered seat
1/2 VW Engine Motor Mount
Optional AL Gas Tank
As you see, we have the optional canopy drawing which Morrey designed to fit a Hummel Bird canopy to the CA-2. Hummel Aviation had a canopy kit for the CA-2 but have since ceased its production. We have considered producing the CA-2 canopy kit but have not had enough interest in an enclosed version. We also include a cut-case ½ VW engine installation drawing with each set of plans for those who desire that 4-stroke sound.
We have also created a CA-2 Information Manual that you can download by clicking on this link: CA-2 Information Manual.
- Crew: One
- Capacity: No passengers
- Length: 16 ft. 6 inches (5.03 m)
- Wingspan: 26 ft. (7.93 m)
- Wing area: 117 ft² (10.9 m²)
- Empty weight: 250 lbs. (113 kg)
- Useful load: 270 lbs. (122 kg)
- Max takeoff weight: 520 lbs. (235 kg)
- Power Plant: Rotax 277, 28 hp. (21 kW)
- Never exceed speed: 80 mph (130 km/h)
- Maximum speed: 63 mph (102 km/h)
- Cruise speed: 50 mph (81 km/h)
- Stall speed: 26 mph (42 km/h)
- Range: 125 SM (203 km)
- Service ceiling: 10,000 ft. (3050 m)
- Rate of climb: 600 fpm (3.05 m/s)
- Wing loading: 4.4 lbs./ft² (21.6 kg/m²)
- Power/Mass: 18.6 lbs./hp. (0.09 kW/kg)
The CA-2 was intended to be one of the lowest cost ways of obtaining an ultralight aircraft. The desire was to design this aircraft using an all metal structure and keep it within the US Part 103 Ultralight category. These goals were met and the resulting aircraft had an empty weight of 250 lbs. equipped with a 28 hp. Rotax 277 engine.
With this set of plans and following them closely, the construction time should only require about 600 hours to build the CA-2. An experienced aircraft builder should be able to build a CA-2 in less time. The airframe is of all-metal construction using 2024-T3 aluminum sheet, extruded angles and tubing, fastened primarily with stainless steel pop rivets. The fuselage and wings are of monocoque stressed skin construction. The wings include plain flaps and differential ailerons. Each wing panel is easily removed from the aircraft by removing only three bolts. The control surfaces are made from aluminum tubing, they are fabric covered and actuated by pushrods. The landing gear is of conventional configuration with a steerable tailwheel linked to the rudder. The airframe structure is stressed to +4.4 and -2.2 g's. Special tools are not required to be purchased, construction only requires the use of normal hand tools, plus a small bending brake and a tube bender.
The prototype is powered by a Rotax 277. Heavier engines can be installed on the CA-2, however, the aircraft will no longer meet US FAR 103 weight requirements for ultralight vehicles. Other engines used include the Rotax 377, Rotax 447, 1/2 VW, Hirth F-33, Kawasaki 340 and Kawasaki 440-2A.
The CA-2 plans may be purchased for $150.00 per set plus shipping cost.
mail to Continental US:
U.S.P.S. mail to Alaska:
U.S.P.S. mail to Hawaii, Mexico, and Canada: $25.00
U.S.P.S. mail to other foreign countries: Contact us for
The plans set will be shipped out insured and placed in a padded shipping envelope for protection. You may use cash, personal checks (must clear both banks), US Postal Money Order, or Certified Check for payment purposes. Note: Georgia residents must add 7% sales tax.
If you wish to purchase online, please use PayPal as your option. This will allow you to use:
Click on the PayPal image below to go to the PayPal website. Use "contact @ adamsaero dot com" for the recipient ("To") e-mail address. Remember to add the appropriate shipping amount plus tax if applicable to the plans total. Please e-mail "klacea @ yahoo dot com" or call 404.219.7326 when you use PayPal, we have had issues with their notification process.
Information is subject to change without notice.