GB-2

 

GB-2 - plan thumbnail image

GB-2 - completed model photo more pics (1)

GB-2  
by HS Sayers
from Aeromodeller
December 1941 
48in span
Tags: Rubber F/F Floatplane Multi
all formers complete :)
got article :)


This plan was found online 05/02/2018 at: http://www.hippocketaeronautics.com/hpa_plans/details.php?image_id=2926
Outerzone planID: oz9769 | Filesize: 168KB | Format: • PDFbitmap | Credit*: mikewight, rchopper56

   

About this Plan

GB-2 Flying Boat - Rubber twin-motor flying boat model.

Quote: "The desire to create a flying-boat that would ROW unassisted was aroused on seeing Mr White's flying-boat in the first Roberts Trophy competition for flying-boats, held at Danson Park Lake on July 4th, 1937, and hearing the experts say it couldn't be done. A little later Mr Suggett showed that a model flying-boat (weighing about 4 oz) could get off the water unassisted by setting up the first record for this type with a time of 9 sec. Mr Sayers' interest was in a model somewhat heavier than this, and with some likeness to the Empire flying-boats, but not quite so large and heavy as Mr White's, which weighed 36 oz. The result was G.B.1, which, on Sunday, July 24th, 1938, at 7 a.m., set up a new British record with a time of 22 sec., from the water of a paddling pool in a Crayford recreation ground. The place explains the early hour, and also the absence of thermals.

Experiment, trial and error had found a suitable position for the water planing surface and step, flying trials over land found the weak places in the hull structure, which were remedied, and October 3rd, 1938, saw G.B.1 win the Roberts Trophy for flying-boats with an average of 18 sec. G.B.1 rose to the occasion again in 1939 by winning the Roberts Trophy for the second time, with flights of 29.26 sec., 29 sec. and three delayed flights on the third round. On the last of these it drifted submerged the length of the lake, and in spite of this it flew again, but not that day.

From data and experience gained from this model, G.B.2, the model drawn and described in this article, was built, and in August, 1940, Mr. Sayers won the Roberts Trophy for the third time. This would have been somewhat of a hollow victory, for it was a walk-over, but for the fact that a new British record was set up. The first flight was less than half a second short of the record held by Mr. Lewis, of the Northern Heights, with 33 seconds. However, conditions were good, and the second flight was 42.3 sec. The model crossed the lake and returned to alight on the near bank. This was repeated on the third flight, the time being 40.8 seconds. The next flight the model made an alighting on the water.

A Fleet Air Arm rating who watched it remarked, " It's just like the real thing." The same wing was used in the record flight of 22 sec. and the three Roberts Trophy competitions, the tail and fin being replaced, but still to the original design, the only improvements being to the hull design and motor nacelles. Five hundred and ninety-five turns were used on the record flight, but the motors should stand 800, and that should increase the duration to 57 sec., so the minute mark is within reach. Although the model reached a ceiling of 200 ft. on its record flight, being over the lake, it must have been in descending currents and so losing duration. This model must be to the delight of the practical flyer and the despair of the theoretical, as it was built without any calculations, design, data or drawings, with the exception of the propellers, and it does fly..."

Update 06/02/2018: Replaced this plan with a clearer copy (patterned background removed) thanks to rchopper56.

Quote: "Hi, Here is the same file with the background removed, respliced and reduced file size. Used Photoshop to increase contrast and brightened when at gray scale - this removed most of the background. Then changed back to monochrome. Gene"

Direct submission to Outerzone.

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