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EZ Fun Flyer?

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Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,300
Location
AMES, IA USA
Does anyone know what happened to the Ez Fun Flyer a Lazair knock-off using 120cc Honda/Clone Engines?

Details: EZ Fun Flyer

Blue Yonder Aviation, Inc.
Box 12, Site 9, RR 5
Calgary, AB T2P 2G6
Canada

Phone: 403-936-5767

http://www.ezflyer.com
ezflyer@ezflyer.com

CATEGORY:
TypeFixed-wingSport-Pilot CompliantNo
StatusCurrent
CategoriesUltralight
PERFORMANCE:
Max Speed (mph)Service Ceiling (ft)12000
Cruise Speed (mph)50Rate of Climb (fpm)400
Stall Speed (mph)17Takeoff Distance (ft)300
Range (statute mi)100Landing Distance (ft)350
POWERPLANT:
EngineRakett 120
Design Horsepower14H.P. Low Range
Fuel Capacity (US Gal.)6H.P. High Range
DIMENSIONS AND WEIGHT:
Empty Weight (lb)251Useful Load (lb)349
Gross Weight (lb)600
Wing Area (ft2)146Length (ft)15
Wingspan (ft)34Height (ft)7
DESIGN:
Wing DesignHighFolding WingsNo
No. of Seats1TandemNo
Cockpit Width (in)26
Landing GearTailwheel
MaterialsMetal
KIT AND PLANS:
Kit AvailableYesQuick-build AvailableNo
Plans AvailableNoIncludes EngineYes
Beginner Build Time (hrs)160Number Built & Flown1
Kit Cost ($US)$13,999Plans Cost ($US)$
Build Cost Range$14,000 - $
COMMENTS:
 

n3puppy

Well-Known Member
Joined
Jun 25, 2019
Messages
148
Does anyone know what happened to the Ez Fun Flyer a Lazair knock-off using 120cc Honda/Clone Engines?
Seems like they shut down the website in 2016
Blue Yonder Aviation - Wikipedia

More info on the "EZ Fun Flyer"
Blue Yonder EZ Fun Flyer - Wikipedia

The link you provided to the Kitplane article won't open for me because I don't have a subscription
Therefore can't see what you saw about adapting Honda/Clone engines to the original design.

The original design was built around two Radne Raket 120 engines used as paramotors.
It's a - 14hp engine weighing only 16lbs (7.2kg) WITH Redrive
Raket 120 Aero RD

With dual engines - Raket vs GX390 (12hp,70lbs)
28hp vs 24hp
32lbs vs 140lbs
251 vs 389 empty weight

So right away at 389lbs using clone engines- would be overweight for US Far 103 (254).


Even if you managed to hot rod a GX120 from 3.5 to 14 hp - you would still be over weight since they are 29lb each - compared to 16 of the Raket. Would put you 23lbs overweight with two engines

A715EECF-5D4D-4494-BF05-8811A2C16F01.jpeg8887481C-1E75-482D-BCB9-550EDA6E2D58.jpeg
 
Last edited:

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,300
Location
AMES, IA USA
Seems like they shut down the website in 2016
Blue Yonder Aviation - Wikipedia

More info on the "EZ Fun Flyer"
Blue Yonder EZ Fun Flyer - Wikipedia

The link you provided to the Kitplane article won't open for me because I don't have a subscription
Therefore can't see what you saw about adapting Honda/Clone engines to the original design.

The original design was built around two Radne Raket 120 engines used as paramotors.
It's a - 14hp engine weighing only 16lbs (7.2kg) WITH Redrive
Raket 120 Aero RD

With dual engines - Raket vs GX390 (12hp,70lbs)
28hp vs 24hp
32lbs vs 140lbs
251 vs 389 empty weight

So right away at 389lbs using clone engines- would be overweight for US Far 103 (254).


Even if you managed to hot rod a GX120 from 3.5 to 14 hp - you would still be over weight since they are 29lb each - compared to 16 of the Raket. Would put you 23lbs overweight with two engines

View attachment 98869View attachment 98870
===============================================

The "EZ Fun Flyer" is/was a Lazair knock off with a Higher MTOW, Lazair 450 lbs vs 600 lbs EZ Fun Flyer. The Lazair had an Empty Weight: 210 lbs (95 kg) with (2) Rotax 185UL's. The Honda/Clone Type GX200 4 Stroke Engines have been successfully used to repower a Lazair making 14-15hp@5000rpm and stayed under Part 103 254lbs. A $99.99 Predator is 212cc. The engine needs about $300-400 in Upgrades for Plane use to turn 5000rpm. With a Simple 1.8 Ratio Belt Reduction Drive, it would be fairly cheap. There are over 20+ Honda/Clone Brand Name Engines out there with lots of HD Racing parts for them. I've never heard of Raket Engines myself. The Rotax 185UL's probably aren't as light as these Raket 120 Engines so they must have really Beefed up the Airframe for that 600 lb MTOW. With Avg, pilot weights at 180-225 lbs even if the Airframe at Part 103, 254 lbs + Pilot 225 lbs + Gas 30 lbs = 509 lbs. 510 lbs need 31hp. 500 lbs need 30.4hp.

Be nice to see a Set of Plans come out for this design. I believe the Series GX200 to GX270 uses the same Case, Cylinder, Head, just use different Bore & Strokes. So the Predator could be Big Bored also for more CC. At 5000rpm you're going to see an Avg of about 3x the Stock Power at 3600rpm with the Upgrades.

GX200 5.6hp x 3 = 16.8hp@5000rpm (68mm x 54mm) 196.1cc
Predator 6.5hp x 3 = 19.5hp@5000rpm (70mm x 55mm) 211.7cc
GX270 9hp x 3 = 27.0hp@5000rpm (77mm x 58mm) 270.1cc

For the Lazair & EZ Fun Flyer, these Engines above are about as big as you can use and stay under Part 103.

Poor Marketing Skills are what kills off most of these Kit Planes. Even $14,000 for a complete Kit isn't to bad a price today for a Legal Part 103. Even a Predator upgraded for 15hp at $500ea + an ACE Belt Drive $669 Shipped = $1,169.00ea x 2 = $2,338.00.

ACE Belt Drive = 2.75 kg or 6.062705 lbs
Predator 212cc = 17 kg or 37.5 lbs Shipping Weight, so lighter when Converted.
 

n3puppy

Well-Known Member
Joined
Jun 25, 2019
Messages
148
Don't know where the 500lbs needs 30.4hp number comes from - but certainly doesn't match the Ez Fun Flyer specs previously posted (or those of numerous other aircraft)
Ez Fun Flyer - 600lbs MTOW requires only 28 hp (14x2)
Aerolite 103 - 600lbs MTOW requires only 28 hp (Hirth F33)
Aerolite 103 Specifications

Even the original Quickie at close to 500lbs (485) only needed 18hp (Onan)
Rutan Quickie - Wikipedia

500lbs /30 hp = 16.7 lbs per hp.
Like the others - Lazair does way better than that
450/19hp (9.5x2) = 23.7 lbs per hp. (42% better)

500lb requiring 30.4hp must be based on a really draggy/inefficient design.
The old Quicksilver MX fits that description -
Wire braced, single surface wing, no fairing etc.
490 MTOW - 30 hp Cuyuna
Eipper Aircraft Quicksilver MX
 
Last edited:

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,300
Location
AMES, IA USA
Don't know where the 500lbs needs 30.4hp number comes from - but certainly doesn't match the Ez Fun Flyer specs previously posted (or those of numerous other aircraft)
Ez Fun Flyer - 600lbs MTOW requires only 28 hp (14x2)
Aerolite 103 - 600lbs MTOW requires only 28 hp (Hirth F33)
Aerolite 103 Specifications

Even the original Quickie at close to 500lbs (485) only needed 18hp (Onan)
Rutan Quickie - Wikipedia

500lbs /30 hp = 16.7 lbs per hp.
Like the others - Lazair does way better than that
450/19hp (9.5x2) = 23.7 lbs per hp. (42% better)

500lb requiring 30.4hp must be based on a really draggy/inefficient design.
The old Quicksilver MX fits that description -
Wire braced, single surface wing, no fairing etc.
490 MTOW - 30 hp Cuyuna
Eipper Aircraft Quicksilver MX
==============================

On any Aircraft, there is a minimum hp needed and an Ideal Hp per Weight. You can overpower any aircraft, but that usually means a Heavier Engine and a more expensive Engine. The original Lazair used (2) 5.5hp Chainsaw Engines, Yes it flew on 11hp, but terribly! Soon upgraded to (2) Rotax 185's supposedly 9.4hp@5000rpm, equals 18.8hp! Many People still weren't Happy with it's Performance and upgraded to (2) Solo 210's which were 15hp ea. Using the 1kw for each 10 kg Power to Weight Rule. The Lazair had a Max. takeoff weight: 450 lb = (204.1166 kg) / 10 kg = 20.41166 kw needed = 27.37249 hp needed!

The Original Rutan Quickie had a Max takeoff weight: 485 lbs = (219.9923 kg) / 10 kg = 21.99923 kw needed = 29.50145 (30hp) needed. It used a Onan opposed four-stroke piston engine, 18 hp (13 kW) at 3,600 rpm! Which was soon upgraded to 22hp! Many People still weren't happy with the Onan's Performance, so People put just about every Rotax at the time on one, 377UL, 447UL, 503UL, even a Skidoo 583.

Quickey with the 583.


No, the "Aerolite 103 - with 600lbs MTOW requires only 28 hp (Hirth F33)". Will it Fly on 28hp, Yes, but it won't perform as well as it should.

Aerolite 103 with the Hirth F-33 is 245 lbs + Gas 30 lbs + Avg Pilot is 180lbs - 225lbs so say 225 lbs = 500 lbs = 226.7962 kg / 10 kg = 22.67962 kw needed = 30.41387 hp needed! You could probably tweak it with just a Bigger 36-38mm Carb, maybe modify the Muffler.

600lbs = 272.1554 kg / 10 kg = 27.21554 kw needed = 36.49664 hp needed! That's Why many people use the Hirth F-23 (50hp) with the BRS Weight Exemption.

The F-33 (28hp@6500rpm) is 313cc and uses 9.5cr with a 34mm Carb and a Muffler.
313cc turning 6500rpm making 28hp = 58 % VE and 42 cfm.

313cc/7cc = 44.7hp@6500rpm if using 11.5cr and a Good Tuned Pipe and proper size Carb. Remember now a Rotax 277 268cc uses a 36mm Carb and 11.8cr. I would use at least a 38mm on the Hirth.

Hirth's F-33 Power graph. You can see where it starts losing hp shortly after 5500rpm. The muffler is probably too Restrictive!
HIRTH F-33 POWER BAND.jpg
 
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