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Knight Twister
Specifications

The first Knight Twister flew in 1929 with a used 45 horsepower Salmson radial engine purchased for $350 -- they wanted to put a NACA streamlined cowl on it but didn't have the $10 to buy a used one! The plane flew just fine, however, operating out of a small, slightly-uphill sod field runway. Landing speed was 45 mph, with the total weight at 550 lbs. Wing loading was 9.17 lbs./sq. ft. and the power loading was 12.2 lbs./hp. All in all, they were quite pleased with the little plane. Originally, the design used a "knee action shock system" but as this provided poor ground handling, it was changed immediately.

The wings are fully-cantilever and are stressed to 9G without wires. Wires were added before WW2 simply because the public wanted to see wires on their biplanes. After WW2 they were removed again.

SPECIFICATIONS:

NOTE: As these are experimental, amateur-built aircraft, every example will be built somewhat differently. Therefore, you will see significant variations in performance between aircraft. The figures below are our published examples generally based upon the performance of the prototype aircraft as listed by the designer. Some figures may be adjusted based on our "real world" experience. We make every attempt to provide accurate, honest, and conservative performance numbers. However, due to variations between aircraft and other factors beyond our control, we cannot guarantee that a particular aircraft will be able to match these figures. They are intended mainly as a guide for comparison purposes.

KNIGHT TWISTER SPECIFICATIONS
Imperial Holiday Acro Coed Notes
BASIC DIMENSIONS
Length ft 16ft 1.5in 16ft 1.5in 16ft 1.5in 17ft 5in Approximate: will vary w/ engine/prop/spinner installation
Height ft 6ft 8.75in 6ft 8.75in 6ft 8.75in 7ft 8.5in Fuselage in level position
Wing Span (Upper) ft 17.5 19.5 15.5 22.5
Wing Span (Lower) ft 15.5 17.5 13.5 20.5
PAYLOAD AND ACCOMODATIONS
Seats 1 1 1 2
Fuel Capacity US gal 30
Baggage Capacity lb 50
DETAILS
Upper Wing Airfoil M-6 ** M-6 M-6 M-6 Acro has same wings as KT-85.
** Original Imperial (N5DF) used NACA 21 airfoil.
Lower Wing Airfoil M-6 ** M-6 M-6 M-6 Acro has same wings as KT-85.
** Original Imperial (N5DF) used NACA 21 airfoil.
Total Wing Area sq ft 76 81 56 130
WEIGHT
Empty Weight lb
Acro Weight lb 840 (Racing wt. shown for Imperial)
Gross Weight lb 1000 972 900 1610 (X-Country wt. shown for Imperial)
Design Load g 8G (9G
w/ wires)
7G 9G
Ultimate Load g
Wing Loading
(@ Acro Weight)
lb/sq ft 11.05 ** ** Racing Wt. shown for Imperial
Wing Loading
(@ Gross Weight)
lb/sq ft 12 16.07 12.38
POWER
Engine (Typical) hp 135-150 125 125-150
Power Loading
(@ Racing Weight)
lb/hp 6.2 (135hp)
5.6 (150hp)
Power Loading
(@ Gross Weight)
lb/hp 7.4 (135hp)
6.7 (150hp)
7.8 12.9 (125hp)
10.7 (150hp)
FLIGHT PERFORMANCE
Stall Speed
(@ Gross Weight)
TAS/mph 50 45 63 55
Cruise Speed TAS/mph 131 150 145
Max Speed
(Level Flight)
TAS/mph 175 149 172 165 Imperial N5DF w/ NACA 21
airfoil flew 185+ in Reno races
Never-Exceed Speed
(Dive Speed / Vne)
TAS/mph 184 210
Maneuvering Speed TAS/mph 102 116
Rate of Climb (Initial) ft/min 1600 1400-1600
MISCELLANEOUS
Plans Price US Dollars $200 $200 $200 $225 Plus shipping and handling
Purchase Plans Online!
Component Availability Some Some Some Some
Fun Factor 10 10 10 20 Wheeeeeeeeee!!!

Knight Twister 3-View Drawings
Model Small Medium Large Printable
KT Imperial 400 x 656 800 x 1312 1917 x 3145 400 x 656
- Side 800 x 600 600 x 800
- Top 800 x 600 600 x 800
- Front 800 x 600 600 x 800
KT Holiday 400 x 609 800 x 1217 2114 x 3217 400 x 609
KT Acro 400 x 705 800 x 1411 1822 x 3213 400 x 705
KT Coed 400 x 570 800 x 1140 2115 x 3013 400 x 570

KT Prototype (1933) 400 x 492 800 x 984 1403 x 1725 600 x 738
KTD-2 (1935-6) 400 x 378 800 x 757 2170 x 2053 600 x 634
KTD-2 (1938) 400 x 379 800 x 758 1056 x 1000 800 x 758
KT Junior (1949) 400 x 584 800 x 1169 2237 x 3268 600 x 877
KT-85 (1949) 400 x 571 800 x 1143 1041 x 1487 560 x 800
KT-85 400 x 548 800 x 1095 2301 x 3151 584 x 800

Note: There are many other images (including excerpts from early construction plans) within our collection of Knight Twister articles which complement these 3-views. In particular, check out the series of articles that Vernon Payne wrote for Popular Aviation in the 1930's.
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