Green Sky Adventures, Inc.    of North Central Florida
  Toll free 888 887-5625         Cell 352 318-5625    or Email
Micro Mong
Zippy Sport
Builder Assistance
Component Pricing
Engine Package
Flight Report
Micro Mong Q&A
1. What is the airfoil section? The closest description is "Modified Rose Parakete"
2. What is the chord length? 37 inches
3 What is the thickness of the main spar? The Micro Mong uses aluminum tubular spars. They are 6061T6 extruded aluminum tube of .083 wall.  Front is 2 1/4" diameter. Rear is 1 3/4' diameter
4 Is the aircraft buildable as a true part 103  ultralight?  The orinal design proto type Micro Mong was constructed and originally flown as a "leagal" part 103 ultralight by making use of many calculation provissions of that rule.  Though theoretically possible, constructing a Micro Mong to fit within the boundaries of part 103 is not recommended.
5. How long does it take to build a Micro Mong? This depends on builder's skills and equipment. Also whether building from plans, or kit.
From Plans, figure 800 to 1000 hours.  From kit, building time will be approximately one half that amount.
6 Does the micro mong go along
    with german rules ?
 The Micro Mong has not been evaluated for any government rules.  It will fall well within the Experimental Homebuilt category for US registered aircraft.  Though it certainly would fit within regulations of many other countries it has not been officially submitted for such evaluation.
7.  I am 6Ft, 250Lbs, will i fit? Yes, But.
Empty weights have been observed to vary from 
around 350 lb to 410 lb using the Rotax 503 package as described at
If a 250 lb pilot flys a 350 lb Micro Mong there remains 50 lb for Fuel and baggage, and still remain within 650 gross weight for Normal Category operation. 
8. What is the wing construction?
  • Aluminum Tubular  Spars
  • Fabricated  aluminum ribs
  • Aluminum Leading Edge
  • Fabric covered
  • Blind Rivet attachment vs. Rib Stitch
9. What is the fuselage construction?
Welded 4130 Chrome Molly tube
10. What Engine is recommended
  • Rotax 503 Dual Carb, with type E Gearbox and 3.0 : 1 ratio. 
  • HKS 700-E (not tested as of 4/1/03)
11.Why do you warn that it is not aerobatic
  • Because it is not. 
  • The Micro Mong Ultralight was designed to fall within Utility Category (which allows spins, steep turns, chandelles and lazy eights.) at 550 lb gross weight.  That is 4.4 Gs+ . By definition, for normal, utility and commuter categories, the negative load limit is at least .4 x the positive, or in this case, 1.76 Gs-. Although it is true the EXP version of the Micro Mong has extra tail brace wires and a Landing Wire, for the sake of safety and conservatism we have not calculated these changes to increase load limits. We must however calculate weight. Finished weights of the MM EXP have varied from 350 to as much as 410 lb empty. A gross weight increase to 650 allows a 200 lb pilot to operate the MM easily within Normal category. 
  • Aerobatic category is 6 Gs + and .5 times that, or 3 Gs negative.
  • To summarize: at 550 gross, we are good to 4.4 Gs+ with at least a .5 safety factor. At 650 we're OK for 3.72 Gs+ with at least a .5 safety factor. In reality considering the relative light weight, low speed, and low inertia, it is not likely one would exceed  positive limits in positive maneuvers. Exceeding negative limits following a botched maneuver may be another story. Consequently, we continue to recommend Normal Category maneuvers only. 
12. How is the HKS 4-stroke testing in the Mong coming along? 
  • Work on three ariframes was resumed following Sun n Fun 2005. As of early June, we are about a week away from priming fuselages.  The immediate goal is to restore our original MM N913RE to flying status with the HKS installation.  Of the other two airframes, one  will constitute a skeletal example for display. The other will be a complete  inventoried kit.  Press releases will be issued, probably in late July, making note about renewed action with this kit that has been in limbo for the past eight years.