SPRATT 103

Pictures

‘Click on them’

 

1) Construction of wings :

 

 

Preparation of the composite panels

specific to the Spratt 103

 

Drying of the panels

(fiberglass fabric + polyester resin)

 

Cutting with hot wire the extruded polystyrene ribs
 

Gluing the leading edge panels on the ribs and the aluminum spars
.
Gluing the intrados and extrados panels
.
Reinforcement of the leading edge
= C spar

(fiberglass fabric + polyester resin)

.
Final painting

(simply, with a roll)

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+ 4 G resistance

(remind :  this concept absorb gusts, so + 1,5 G is its real maximal effort in use)

 

2) Construction of the trike :

 

   

TIG welding of the stainless steel tubes

(standard quality and dimensions)

   

This is a simple and fast fuselage to realize !
.
Centering the C.G.

(remind : the Spratt 103 is a real pendular concept !)

 

3) Engines :

 

First tests :

Honda GX620 (20 hp) with reduction

(low power and too many vibrations due to the reduction unit)

.
 Kolher (25 hp)
in direct drive
 
   

Briggs & Stratton (23 hp)
with prototype propeller

(weak engine…)

   

Honda GX690 (22 real hp)

(perfect)

 

 

Very economic 25 hp engine

(‘2 CV’ Citroen car engine)

 

Ecologic and economic engine in development

(diesel consuming 1 liter per hour of frying oil !)

Actual engine :

Subaru EH72 with injection

Perfect !  26 hp, 2000 € and 5 years warranty !

 

4) General views : 

 

 
.
Left side view
 
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Front side view
.
Right side view
.
Paris / Le Bourget

(june 2002)

.
Amphibious version

front side view

.
Amphibious version

right side view

.
Amphibious version

(fluctuat nec mergitur !)

.
In flight

right side view

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In flight

virage

.
“Follow this Spratt !”
 

Bernard Geffray
Designer of the Spratt 103
Named ‘Robin Hood’ in one of the 37 articles in Medias page
😉