Twin Fin (oz9820)
About this Plan
Twin Fin. Radio control sport model. An unusual mutli-sports design spanning 65in for 2.5 - 3.5cc motors.
Quote: "TWIN-FIN was designed as a simple to fly RC sports model for intermediate multi gear, with semi-scale appearance and the flying characteristics of a sports model, with particular emphasis on glide performance. There have been persistent requests for plans from numerous people who have seen it fly, so here it is.
Although the span is 65in the model is amply powered by a 2.5 cc diesel or equivalent capacity glow plug engine and while not intended to fly 'the pattern', it will easily perform all aerobatic manoeuvres on this power, with the exception of outside loops, whilst the glide is remarkably good - if there is any lift about it will stay up indefinitely. Over the last five years or so, the prototype has been flown with an AM 2.5, an OS.19, and an Oliver Tiger 2.5, the latter being particularly suitable. This is the maximum power that is recommended.
Fitted with Grundig Varioton radio, this model is well over the 3,000 flight mark which will give an indication of its durability - a recent mid-air collision which resulted in the wings parting company with the fuselage at 500 ft resulted in merely superficial damage! Only aileron and elevator controls are used, although a recently built version is now flying with three function proportional incorporating throttle control.
No difficulty should be experienced by the average modeller, normal construction methods being employed. The fuselage is a simple sheet-sided structure with 1mm ply reinforcement in the radio compartment area. The curved decking on the rear fuselage is easily applied in one piece there is no need to plank it if a fairly pliable sheet of balsa is chosen. Merely moisten one side and heat the other in front of the fire and it will curve naturally and can be cut to fit by trial and error on the job before gluing. The undercarriage fixing is unusual, being of the plug-in variety, but it has the advantage of being easily removable without the use of rubber bands..."
Twin Fin, RCM&E, July 1971.
Direct submission to Outerzone.
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(oz9820)
Twin Fin
by Dennis Thumpston
from RCME
July 1971
65in span
IC R/C
clean :)
all formers complete :)
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Submitted: 15/02/2018
Filesize: 614KB
Format: • PDFbitmap
Credit*: Circlip, RFJ
Downloads: 622
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User comments
This is a brilliant fly-for-fun design. I remember being greatly impressed by its performance when I used to fly with Dennis Thumpston in Sutton Park in the mid-sixties; in fact it was the inspiration for my Mandrake (oz9577) design, which followed the same configuration. Twin Fin can 'turn on a sixpence' but is incredibly docile and will also fly in quite breezy conditions. I have built three versions over the years, two powered by an AM25 diesel as per the original and a slightly redesigned version for electric power (400 watt motor, 3s LiPo). All fly identically to Dennis' original. Definitely my 'go to' model if I want a bit of relaxed flying - visually it looks very much like a single-engined Lancaster in the air!JeremyCollins - 03/05/2018
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- Twin Fin (oz9820)
- Plan File Filesize: 614KB Filename: Twin_Fin_RC_oz9820.pdf
- Supplement Filesize: 864KB Filename: Twin_Fin_RC_oz9820_article.pdf
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Notes
* Credit field
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Scaling
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