• Hi Guest! Forum rules have been updated. All users please read here.

Grumman Design 30 - "Single Seat Fighter (Tractor)" 1937

overscan (PaulMM)

Administrator
Staff member
Joined
Dec 27, 2005
Messages
12,587
Reaction score
3,888
From Tommy Thomason.

I redrew this from an ancient Grumman diazo print which was too big to copy/scan. It was provided to me by the Grumman Aviation History Center. The title is General Arrangement Single Seat Fighter (Tractor). I'll provide a drawing of the Pusher in a week or two. They may yet find the twin-Allison engine powered proposal, but I wouldn't hold my breath.

As noted on my three-view, it is dated 16 December 1937. Also on the drawing:

Weights
Wing Group 690
Tail Group 92
Body Group 570
Landing Gear Group 366
Power Plant Group 2,260
Fixed Equip Group 443
Weight Empty 4,421

Crew 200
Fuel (110 gal.) 660
Oil (9 gal.) 69
Armament 287
Equipment 136
Useful Load 1,351

General
Wing Area 237
H.P. 1,000
Wing Loading 24.4
Power Loading 5.77

It doesn't say so on the drawing, but it is clearly a V-1710 powered study with the engine aft of the pilot as on the P-39. However, the pilot is located well forward, which would be good for carrier landings. The landing gear is obviously the original Grumman system. There's no indication of wing fold, but this wasn't a firm requirement for fighters or dive bombers at the time.

I don't know if a design number at Grumman is the equivalent of a model number elsewhere. At Bell Helicopter, design numbers were assigned by Engineering to keep track of studies. Model numbers were assigned by management and only when an aircraft was being formally proposed or had been released for development.

Francillon identifies the G-30 as a "proposed two-seat Navy fighter powered by an Allison V-1710." Same for the G-29 pusher. The drawings that Grumman sent me are both of single-seaters, as you might expect for a fighter with a single Allison engine.
Best regards,

T
http://tommythomason.com/
 

Attachments

  • Grumman Design 30.jpg
    Grumman Design 30.jpg
    127.9 KB · Views: 447

Antonio

ACCESS: Top Secret
Staff member
Senior Member
Joined
Jan 22, 2006
Messages
3,515
Reaction score
249
That's pure gold to me.

Thanks a lot!!

Antonio
 

Justo Miranda

ACCESS: Top Secret
Senior Member
Joined
Dec 2, 2007
Messages
4,457
Reaction score
2,404
Website
www.amazon.com
Good finding !
It looks like the Koolhoven FK 55 ...
Source "Koolhoven" by Theo Wesselink & Thijs Postma
Unieboek bv, Bussum 1981
 

Attachments

  • Escanear.jpg
    Escanear.jpg
    102.7 KB · Views: 360

lark

ACCESS: Top Secret
Senior Member
Joined
Feb 17, 2006
Messages
1,806
Reaction score
77
A Grumman unknown,a real delight :p
 

nugo

ACCESS: Secret
Joined
Feb 2, 2006
Messages
337
Reaction score
11
Hi All.

If it is possible show Grumman Design 25--proposed Navy High-altitude Fighter with two Allison V-1710 engines.
 

Vahe Demirjian

I really should change my personal text
Joined
Mar 1, 2013
Messages
617
Reaction score
273

Similar threads

Top