Lazy Ace - Radio control sports model. 76in span, 1800 sq in area (plus lifting stab), for .60 power and 4 channels. Model # pl-706. Designed by Chuck Cunningham. Featured in RCM 11-77.
Quote: "2,150 square inches of giant biplane ...just right for flying on a lazy Sunday afternoon. Almost quarter scale to a full size bipe. The Lazy Ace is just pure fun to build and fly.
The Lazy Ace is an airplane that is just what its name implies. It is for flying on a lazy Sunday afternoon when you want to fly and fly and fly. In fact, it is one fine flying machine. I have had more pure fun flying the Lazy Ace than from any other aircraft that I have ever designed, or flown, for that matter. The Lazy Ace was designed to be a super biplane, and it is. It was designed to fill the need for a really good flying, realistic looking big biplane, and it is.
The Lazy Ace is a big airplane, just about quarter scale size of a home-built, although it is not a scale model of anything. On the other hand, a light plane builder could scale the Lazy Ace up and come out with a very fine full size experimental aircraft. My wife keeps wanting me to do this, but I have resisted so far. But, back to the model.
As I mentioned it is a big bipe, the total wing area is just a bit over 1800 square inches! Both wings span 76 in and the fuselage length is 57 in. It has a lifting horizontal stab for a reason, and this area, coupled with the wing area, gives it almost 2150 square inches of lifting surface. It is a big bipe to satisfy that urge to build a big aircraft and yet it flies perfectly on any of the powerful .61 engines like the Max .60 FSR or the Webra Speed .61. The normal .60 engines will fly it well, but the Schneurle engines really make it perform. You don't need a chain saw engine or a power transmission for this aircraft because, even though it is big, it is light in weight. My Lazy Ace tips the scale at only 9-1/2 pounds, which gives it a wing loading of just a bit over 12 ounces per square foot. This means that the aircraft is flying on the wing rather than just on the engine as do so many of todays pattern aircraft.
The construction of the Lazy Ace has been patterned a bit after the manner in which I have been building and beefing up Old Timers and Antiques, and so far this structure has proven to stand up to any strain. And last weekend, old friends Jim Simpson and Gerry Krause, seemed to be trying to take the wings off of it with outside spins, crazy maneuvers that ended in long power dives, etc but then you know what its like when you're flying other peoples aircraft. Or, at least until I told Jim that I had finished drawing the plans so it wouldn't be too hard for him to rebuild it! But, nothing came un-glued, and we flew a gallon of fuel through the engine just having a lazy afternoon of fun flying.
I, as yet, have not found any bad tendencies with the Lazy Ace. It can be slowed down until you just know that it is going to fall out of the sky, and yet it doesn't. It can be bounced in for a hard landing, and yet when full throttle is fed to it, it has no desire to torque over and die. Landings are a dream - it can be stowed down to a walk with the tail down for a three point landing, or can be brought in fast for a wheel landing with the tail high. The take-off run is true and lift off is in about twenty five feet, ail without any urging from up elevator.
Now, to the point about the lifting stab As many of you will remember, I have written several times that the way to make smooth take-offs with a tail dragger is to get the back end of the aircraft up and flying as soon as possible. With the lifting stab on the Lazy Ace, as soon as you feed in high throttle, the tail lifts off of the ground and the aircraft assumes a perfect take-off attitude. As a matter of fact, on the very first flight of the Lazy Ace, it made this type of a take-off run and soared majestically into the sky, climbing out just like a full scale aircraft at the hands of a competent pilot. A large cheer went up from those who came out to the field to witness the first flights. Just about the only thing that had to be done after the first flight was to get the engine to throttle back to a normal idle. Everything else was perfect. The angles of incidence, in this case, top and bottom wing set at zero, stab at zero, and engine at several degrees downthrust, were perfect.
In fact, if you think that I am high on this aircraft, I really am. It is the best that I have designed and really the easiest to fly. The flat bottom wing allows this aircraft to fly just like its big brother would if it had a big brother, and yet the Lazy Ace can be flown inverted from horizon to horizon with very little down stick. The only place that the flat bottom wings show up to a disadvantage is in the outside maneuvers. I have yet to do a really good outside loop, as it is a bit tough to tuck under, but other than this, the flat bottom wing makes up for any sacrifice by being so darn flyable, and yet so for-giving that I would not want to put a semi-symmetrical airfoil on it, and cer-tainly not a symmetrical section.
The structure of the Lazy Ace is strong, and yet very light, and it is super easy to build, It does take a good amount of balsa wood, and about four or five rolls of MonoKote to cover it..."
Direct submission to Outerzone.
Update 03/04/2015: Replaced this plan with a clearer copy, thanks to Balsworkbench.
Article pages, text and pics, thanks to hlsat. Also, previous scan version.
Did we get something wrong with this plan? That happens sometimes. Help us make a correction
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2018.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.