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From: Miloch <Miloch_member@newsguy.com>
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Subject: Makhonine Mak-10
Date: 25 Apr 2019 06:12:23 -0700
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https://en.wikipedia.org/wiki/Makhonine_Mak-10
In the early 1930s several designers became interested in the possibility of
changing the configuration of wings between take off and fast flight. Two routes
were explored, the first primarily involving camber and hence lift coefficient
reduction and the other a decrease of wing area by span reduction at high speed.
The Schmeidler variable wing and that of the Gloster built Antoni-Breda Ba.15
were examples of the first group and the Makhonine Mak-10 of the second.
Details of the Mak-10 are sparse but its novel feature was a telescopic wing
which increased the span for take-off by 8 m (26 ft 3 in) or 60% of its high
speed configuration. The outer panels retracted into the central ones, their
inner ends supported on bearings rolling along one or more spars. The ends of
the centre section were reinforced with cuffs. The wing apart, it was a
conventional cantilever low wing monoplane, with twin open cockpits, the rear
one sometimes faired in, and faired, fixed landing gear. It was powered by a 480
kW (644 hp), three bank, W-configuration, twelve cylinder Lorraine 12Eb engine.
Role
Experimental aircraft
National origin
France
Designer
Ivan Makhonine
First flight
11 August 1931
Number built
1
The first flight of the Mak-10 was on 11 August 1931. During four years of
Mistral Major fourteen cylinder, two row radial engine which gave it a top speed
of 380 km/h (240 mph) and the new designation Mak-101.
44 years later, the Akaflieg Stuttgart FS-29 experimental high performance
sailplane also used telescopic wings to optimise both low speed thermalling and
high speed penetration performance without the added induced drag of camber and
area changing flaps.
Specifications (Mak-10)
General characteristics
Crew: 2
Wingspan: 13 m (42 ft 8 in) retracted
21 m (69 ft) extended
Wing area: 21 m2 (230 sq ft) retracted
33 m2 (360 sq ft) extended
Gross weight: 5,000 kg (11,023 lb)
Propellers: 2-bladed
Performance
Maximum speed: 300 km/h (186 mph; 162 kn)
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