Boeing NB

__NOTOC__ Infobox Aircraft
name=NB


caption=Boeing NB-1 floatplane
type=Military trainer
manufacturer=Boeing
designer=
first flight=1924
introduced=
retired=
status=
primary user=
more users=
produced=
number built=ca. 72
variants with their own articles=The Boeing NB (or Model 21) was a primary training aircraft developed for the United States Navy in 1924. It was a two-bay, equal-span biplane of conventional configuration with interchangeable wheeled and float undercarriage. The pilot and instructor sat in tandem, open cockpits.

The NBs were produced in two batches; the first (NB-1) were powered by radial engines and the second by war-surplus Vee-8s still in the Navy's inventory. The original prototype evaluated by the Navy had been assessed as being too easy to fly, and therefore of limited use as a trainer. In particular, it was noted that the aircraft was impossible to spin. The NB-1 design attempted to introduce some instability, but it was soon discovered that while it was now possible to get the aircraft into a spin, it was virtually impossible to recover from one. A series of modifications were made to attempt a compromise.

Variants

* VNB-1 - prototype (1 built)
* NB-1 - original production machine with Lawrance J-1 radial engine (41 built)
* NB-2 - production machine with Wright-Hispano E engine (30 built)
* NB-3 - one NB-1 with lengthened fuselage and modified empennage to improve handling, and Hispano-Suiza E engine. Later refitted to standard NB-1
* NB-4 - one NB-1 converted similar to NB-3, but with Lawrance J-1 engine. Later refitted to standard NB-1

Operators

;USA
*United States Navy

pecifications (NB-1)

aerospecs
met or eng?= eng

crew=two, pilot and instructor
capacity=
length m=8.76
length ft=28
length in=9
span m=11.23
span ft=36
span in=10
dia m=
dia ft=
dia in=
height m=3.56
height ft=11
height in=8
wing area sqm=32.0
wing area sqft=344
rot area sqm=
rot area sqft=
aspect ratio=
empty weight kg=969
empty weight lb=2,136
gross weight kg=1,287
gross weight lb=2,837

eng1 number=1
eng1 type=Lawrance J-1
eng1 kw= 149
eng1 hp= 200
eng1 kn=
eng1 lbf=
eng1 kn-ab=
eng1 lbf-ab=
eng2 number=
eng2 type=
eng2 kw=
eng2 hp=
eng2 kn=
eng2 lbf=
eng2 kn-ab=
eng2 lbf-ab=

max speed kmh=160
max speed mph=100
max speed mach=
cruise speed kmh=
cruise speed mph=
range km=480
range miles=300
endurance h=
endurance min=
ceiling m=3,110
ceiling ft=10.200
glide ratio=
climb rate ms=2.6
climb rate ftmin=510
sink rate ms=
sink rate ftmin=

armament1=1 × trainable rearward-firing .30 machine gun (optional, for gunnery training)
armament2=
armament3=
armament4=
armament5=
armament6=

References

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ee also

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