Tiger Moth (oz13406)
About this Plan
Tiger Moth. Radio control scale model biplane. Wingspan 70 in, for 50 to 80 engines and 4 functions. Scale is 1/5.
Direct submission to Outerzone.
Quote: "Yo, one that shouldn't be lost to history. 70 in Tiger Moth from David Boddington. 70-120 engine, flies great on a 91 4st. Note this is a used plan, so is a bit rough, but it's all we have at this time. As this is quite an intricate build anyway, this will not produce any hardship for an experienced builder."
Note this plan needs cleanup. There is quite a lot of distortion here. It would be a lot of work, to straighten out this one out. Advise caution for builders.
Update 31/10/2021: Added article, thanks to RFJ.
WE VERY QUICKLY get used to the idea and appearances of larger models and there is no doubt that the average size of scale models has increased considerably over the past five or six years. The days when 1/6th scale was the norm have gone and modellers are looking to one size up, no doubt because the larger model looks more impressive on the ground and in the air. I would guess the limiting factor these days is not related to engine capacities but more to the problems of storage and transport.
The 1/5 scale Tiger Moth, in keeping with today's trends, is large enough to look good and behave well in the air and to take detailing without increasing the wing loading excessively. It also makes a nice stable companion for the 1/5 scale Gypsy Moth already in our Plans Service (RSQ1566).
You will find descriptions of the ubiquitous Tiger elsewhere in this magazine, plus photographs and plenty to whet your appetite for colour schemes. The plans show all the basic airframe which I have kept in a form suitable for the 'Sunday Flier'. However, I know by experience that some of you will go on to detail your model and make it look absolutely superb - much better than I could. The model is reasonably accurate in outline and section (I am not convinced that a truly accurate model of the 'Tiggie' has been constructed - that should bring the letters!) But I haven't included all the details such as Air Speed Indicators, Fuel Gauges, static tubes, venturis etc. I would suggest that you buy the scale drawing (3066 Price £7.45 including postage) for assistance in modelling any details you may wish to add. It will also give you an excellent idea of how the rigging wires are located.
Construction: Have a good 'read' of the plan and make sure you understand the methods of construction. There are no hidden problems (or shouldn't be) it is intended to be an easy to build, easy to fly, biplane. The two prototype models were built by Bert Smith and Tony van Geffen without the benefit of any instructions and only minor queries cropped up and these have been made clear on the drawings.
Sort out your engine fitting so that the engine mounting plate is correct, you will probably find it easier to install a four-stroke engine, simply because it is easier to cope with the exhaust/silencer in the cowling. Incidentally, it is not too difficult to construct a cowling from plywood and balsawood but, if you prefer, the old Complete-A-Pac 'large' Tiger Moth cowl will fit.
Fully operating closed loop control linkages are shown on the drawings for the rudder and elevator surfaces and these are to be preferred to pushrod linkages. Because the one piece wings have inherent strength the wing bracing wires do not have to be structural. On the full-size aircraft the RAF flying wires are oval in section and it is up to you whether you wish to emulate these or are satisfied with a round section (an easy, if not very scale, way out of the rigging is to use hat elastic). For streamline sections try 'mangling' small section plastic tube and slipping this on the bracing wire.
The undercarriage shown on the plans is a plain, unsprung affair, relying on the slight spring in the wire and the airtrap wheels to provide the shock absorbing. This is quite adequate for sports flying but if you prefer a really sexy fully sprung undercarriage you should follow Sid Hazell's design from the Summer issue 1986 of RCSA (Photocopies can be supplied, price £1.50 from ASP Photocopy Service at Hemel Hempstead, mention 'Undercarriage for a 'Tiggie' pages 45 to 47). Sort out your best quality light balsa, cut accurately and go easy with the adhesives and you will be rewarded with a delightful model with good flying manners.
Although 1/5 scale accessories are only just beginning to come on the market Pete's Pilots are selling 1/5 scale civilian torsos which are ideal for this 'Tiggie'. I have also received a set of floats from Len's Floats in the USA and we hope to be fitting these to one of the models and giving a full product report in the issue after next of RCSA.
Wings: As usual with biplanes you have to build four wing panels and in this case, two centre sections. Because the sweep back and dihedral is different on top and bottom wings do make sure that you use the correct wing panels for the right centre sections at the stated dihedral - it is difficult to get it wrong - but.
Ailerons are on the lower wing only, which considerably eases the problems of control linkages. A centre servo and pushrods are indicated but you can use mini-servos in each wing panel if you prefer. Do try to arrange for differential aileron movement (more up than down) as the ailerons are not over effective, although better than the full-size, and you will be using quite large movements. Equal aileron movements up and down will almost certainly give you adverse yaw.
Whether you fit the upper wing slats, fixed or operative, is you decision but there is an article describing working slats in this issue.
Wing panels are built flat on the building board in the conventional manner, remember to angle the root ribs of the outer wing panels to the templates shown. The wing tip sheeting is curved to give an impression of undercamber when viewed from the side. Note the positions of the top and bottom leading edge riblets and do fit the 1/16 vertical grain webbing as this adds considerably to the rigidity of the panels. Build the ailerons with the lower panels and then cut free.
When the panels are constructed and sanded they are joined to the centre sections, propping up the tips to the dihedral indicated and ensuring that the root ribs mate accurately (a misalignment at this stage will cause a permanent mis-rigging). When the glue (PVA can be used for most of the construction) has dried remove the wings from the board, mark the positions of the dihedral braces and cut the slots with a razor saw. Slip in the dihedral braces and, using a slow drying glue, permanently position them, putting the wing assembly back on the packing pieces to once again ensure accuracy. Fit the wedge shaped reinforcement pieces...
Supplementary file notes
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User commentsWow! I’ve been looking for this plan for years. It was lost in the Nexus Traplet move. Never to be seen again until now. Thanks for returning it to the community.
Dave Pentland - 31/10/2021
Whoa... a rarity for Boddo, who usually designs small models to cater to the preference of UK modelers (and probably his own preference too). He seems to have put out a whole family of Tiger Moths 3 or 4 sizes. Nice!
RC Yeager - 01/11/2021
Indeed this is a great find as the plan is unavailable from any other source!
By the way this is a 1/5 scale version but Boddo did produce also a 1/4 scale one that is close the same design, although that is currently available from "Flying Scale Models" magazine.
Jesus Cardin - 11/11/2021
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