Builder_Title
Super Lazy Ace Biplane

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  This model was purchased from Vic Mazura several years ago. Plans were purchased from Sky Master Industries. 2440 Colonial Parkway, Fort Worth, TX 76109
This model was specifically designed to be a gentle, easy-to-fly biplane. It is supposed to be able to slow down to a walk and make three point landings the norm. Standard size servos can supposedly be used on this model, but we'll use servos in the 90 to 120 in oz torque range.
The specs are awesome:
  • Wing span 96-inches
  • Wing Cord 15-inches
  • That's 20 square feet of main wing area!
  • Fuselage Length 74-inches
  • Power Q35 - Sachs 3.7
  • Advertised Weight 21 - 25 lbs.
  • That makes the wing loading 16.8 - 20 oz per sq ft
  • A Zenoah G-62 will be used 4.5 HP (if we can get it running again!)
fuselage Like most projects, we started out using the triple beam balance. Note the ultra light spackling compound (DAP Fast 'N Final) used to finish the wood fuselage. This stuff is great. A credit card was used to spread the thin coats of spackle. This stuff doesn't shrink much and sands easily (wear a dust mask when sanding).
The fuselage weighs 2616 grams (5.75 lbs) as received.
G62_test_Stand The Zenoah G62 engine on a test stand. This is a 3.6 cubic inch gasoline two-cycle engine. This particular engine was tached at 9100 RPM with 20x10 prop on a tuned pipe in the air!
The engine was to be used as one of three for the Reno style T6 races. The racing never happened and the engine was retired until now!
The engine is being restored to operation. It is rated at about 4.5 HP.
Gussets.jpg The entire fuselage was cleaned up using a tacky wipe and re-sanded.
Just to be on the safe side 1/16 - inch aircraft grade plywood gussets were added across all of the fuselage glue joints. Existing glue joints were scraped and sanded smooth. Then the plywood gusset was cut using the band saw and glued with CA adhesive.
A total of 9 gussets were added to each side.The structure is noticably more rigid.
The fuselage, with the bottom covered with 21st Century Fabric, now weighs 2696 grams (5.94 lbs).
Firewall Also, 10-24 blind nuts were added for mounting the vibration isolation mount for the G62. 1/4-20 blind nuts area also installed for mounting a Quadra Q35.
Spacers were added to the engine mount for the G62 to get the engine prop driver to protrude by 1/16-inch from the fuselage. The Quadra will protrude by 1/2-inch, but is not expected to be used initially.
The t-nuts or blind nuts are epoxied into the firewall.
Light red 21st Century Fabric covering is being applied to the fuselage.
fuselage_cover2 The fuselage is taking shape. The side is covered with Light Red 21st Century Fabric. This covering material is nice to work with. We have our iron set to 250 DEGF for this material. We're still learning covering technique, but using patience, stretching, cutting tabs to help stretching and heat work far better than heat and pressure.
We still need to add supports in the horizontal stabilizer for the two elevator servos. The servo wiring and pull-pull cable system for the rudder will be finished before the other side is covered.
The finished product The plane has been completed to the point of the maiden flight. The engine power was way down, but the plane flew great. Lengthening the header for the tuned pipe 5 inches fixed the problem with the G62 performance. The static on-the-ground engine speed is now tached at 7250 RPM with a 22x10 prop. Not bad!

Last updated: 10/19/00

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