Jabberwock (oz2978)

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Jabberwock (oz2978) by Wally Simmers 1939 - plan thumbnail

About this Plan

Jabberwock. Class C cabin rubber model, by Midwest Models. Wingspan 31-1/2 in, projected area 135 in sq.

Update 28/6/2025: Added electric conversion article (from R/C Model Flyer, December 2003) thanks to RFJ.

Quote: "I decided to convert my Jabberwock 32 inch span FF job, to electric powered radio control. As a starting point I weighed available bits and pieces in an attempt to calculate a potential wing loading figure; this is what came out:

Mini Daisy motor/gearbox with PICO MOS 7 BEC speed controller: 35g.
3 x 3v Tadiran cells with lead: 57g.
Ikarus Mini6 Rx with full size crystal and aerial: 13g.
Pico C5 Rx with tiny crystal and 16" aerial: 7g.
RCS Technik motor and carbon prop with inline gearbox: 39g.
SuperTec PICO JP servo with Futaba style lead: 7g.

I opted to use the Mini Daisy power train; this came to me from McGregor supplied with the model, and it was they who put me onto the Tadiran Lithium batteries from Falcon Kits. The batteries can only cope with small power demands of around 0.5A. Testing the Mini Daisy motor showed me that it draws less than .5amps, so I have used these together on previous occasions. Hillcott had supplied me with the Pico C5 receiver, which I have never had a glitch with and, equipped with a couple of PICO JP servos, I was ready for action.

CONVERSION: A new nose was built for the Jabberwock, incorporating 1/16 sheet doublers to which the motor mount tray was fitted - the motor on top, the batteries underneath, held in place with a Velcro pad. The servos were located at the rear of the fuselage, screwed to crosspieces glued between the longerons. The Rx was also positioned at the back, in the bay in front of where the rubber motor peg used to be fitted, mounted on a 'sticky pad' on a balsa plate.

The CG is nearly at 50%, so she glides well, and there is enough movement to make the model sensitive, but not uncontrollable.

It is possible to fly for two hours with the Tadiran Lithium cells without a charge, but as the batteries are difficult to get hold of, I already have fitted a set of Lithium Ion cells (available from J Perkins) - the duration is superb. The model, in this configuration, has proved to be an excellent first RC model and perfect for the novice who is keen to have a go."

Supplementary file notes

Electric conversion article.

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Jabberwock (oz2978) by Wally Simmers 1939 - model pic

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Jabberwock (oz2978) by Wally Simmers 1939 - pic 003.jpg
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User comments

Please can you tell me the position of the center of gravity. Best regards
Richard - 12/02/2019
Not sure if Wally Simmers ever showed on his rubber powered designs the Center of Gravity location. My interpretation is that you need to test for the location by simple hand tossing (gliding), adjusting to nose weight until you achieve a smooth glide. Usually somewhere between 1/3 to 1/2 the wing chord for rubber powered models.
rchopper56 - 13/02/2019
Considering the large and lifting tail I suggest not less than CG position at 60% of wing cord - also, check the Double Jabberwock (oz8000), which has CG position indicated on the plan.
Pit - 13/02/2019
The Midwest Kit plans for the Jabberwock II show a CG range on the plans between 24.5 and 28.2mm from the back face of the nose-block at the fuselage front.
(Nose block dimensions may vary)
Peter Becker - 24/01/2023
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