Canadian Flag Blowing In The Wind Ron Leclerc Zenith CH701 Construction Log


Zenair CH701 STOL Aircraft...
CH701 STOL

Winnipeg

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Metric Converter

mm
ft
in

Note:
1 in = 25.4 mm
1 ft = 304.8 mm
1 ft = 12 in

 
 
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Question:
What about the VW Type 4 Engine... a lot of people have never heard of it?
Answer:
The Type 4 refers to an engine type which was original equipment in the Volkswagen 411 and 412 model cars, late 1972 to 1979 VW Buses, 914 Porsches and the 1976 Porsche 912. The VW Type 1 engine we are all familiar with was used VW Bettles and VW Buses(up to late 1972 - Type 2). After late 1972 the VW Bus Type 2 engine became a Type 4 engine - but still was called The Type 2 engine! So all late 1972 Bus engine parts are Type 4 parts!

Although the Type 4 engine is similar in appearance and design to the VW Type 1 Beetle and VW Type 3 engines, virtually none of the parts are interchangeable.

In fact, everything about the VW Type 4 engine components are much stronger than those of Type 1 engines, making the VW Type 4 the perfect power plant for high torque and big horsepower applications. The VW Type 4 engine case is cast from #319 all aluminum alloy and heat treated to improve the machinability and strength. The alloy is much stronger than the magnesium alloy used in the casting of the standard VW Type 1 style cases. The VW Type 4 case is also designed to withstand many more times the stress of the standard magnesium VW Type 1; however, the extra strength is gained at the cost of increased weight. The typically stripped VW Type 4 engine case weighs approximately 44 pounds, about 20 pounds heavier than a VW Type 1. Now the VW Type 1 engine case is prone to cracking behind the #3 cylinder and did not hold torque very well. It was common when doing and engine job to find that some of the case and head bolts were loose could be turned out with the fingers!

VW Type 4 cases usually don't require align bore machining except where there has been extreme abuse or the case bolts have loosened or broken. The VW Bus and Vanagon 2.0 liter cases usually show the most signs of wear and should be carefully examined.
 

Question:
Does the longer extended wing 29.5' work better for the 701?
Answer:
Yes... is the short answer! That is a good question, and the long answer is - the 701 wing was designed in 1984, for the original much lighter 2 cycle Rotax engine. Since then the gross weight was increased to 1100 lb as a result of the heavier Rotax 912 engine... but the wing never took into account the increase in wing loading. This shorter wing has to work much harder carrying the increase in weight... so increasing the wing length was a no-brainer. The idea was proposed by JG at - StolSpeed along with many other modifications... the main being the removal of the Slats and the addition of VG"s(Vortex Generators).
 

 
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