About this Plan
Stampenezer. Free flight all-sheet sport model.
Quote: "Ebebezer variant for 0.5 cc power. Stampenezer, by David Boddington.
lan Jupp's comment - That's not an Ebenezer, the glide is far too good! - was made when I was enjoying myself flying the second of my Stampe versions of the Ebenezer theme - the same couldn't be said about the Kometnezer (Me163), which didn't get as far as the glide! For biplane lovers and free flight advocates, this simple model is a good introduction to the delights of all-sheet Ebenezer models; it is a little larger than some of the models, which helps to keep the wing loading down and also helps with the good flying characteristics. There are plenty of colour schemes to choose from, both simple ones and more complex decorations, such as those used by the Rothmans Team. Let's get started.
PLAN AHEAD: The drawings for the Stampenezer are on both sides of the centrespread. I suggest you take an A3 photocopy of these pages, including one reversed of the wing panels, so you don't have to cut up the magazine.
You must space the beech bearers to suit the engine used - I have an MP Jet Classic .04 diesel (no longer made) in the prototype and a DC dart in the second. Both engines are equally suitable.
Perhaps producing your own lite-ply (0.8mm ply outer skins and 1/16 balsa core) may seem to be 'gilding the lily' but it is these small things which make for a more practical model - the ply/balsa cabane structure is certainly necessary.
The flying surfaces are all from 3/32 balsa sheet, the LE of the wing is reinforced with 3/32 x 1/8 spruce. I didn't fit anti-warp strips across the chord of the wingtip, but you can fit them if you think the wings will warp without them. The centre section of both wings is flat and the outer panels glued at the appropriate dihedral - the lower wing has more dihedral than the upper wing. Reinforce the wing joints with bandage and PVA glue, or lightweight glasscloth and epoxy. Small diameter bamboo sticks form wing locators matching the edges of the wing platforms on the fuselage - flatten one side and glue them to the centre section surfaces (bottom for top, top for bottom). Cut out the trim tabs from the surfaces - it looks neater than fitting ali tabs at a later date.
The fuselage uses 1/4 in balsa sheet, reinforced with 1/16 x 1/4 spruce, or very hard balsa, over the rear outline, a 1/8 x 1/4 spruce centre spar and 0.8mm ply either side of the nose. The wing platforms are also laminated, this time from 0.4mm and 1/16 balsa, although you could substitute hard 3/32 balsa instead. The cabane strut is fitted before the ply nose doublers - note that the tops are notched into the platforms.
If you are feeling particularly lazy, you can fit a simple, unsprung undercarriage, sewn to the fuselage, but the sprung one shown is more forgiving during test flights. Bend the 16 swg piano wire legs as shown, remembering to fit the length of brass tube before making the bends on the second side. Bind and solder the 18 swg top leg pieces to the legs - the tops are curved to take the shock-absorbing rubber bands. I use orthodontic rubbers for this purpose, feeding them through the fuselage with a small hook. Bind and epoxy the tube to the 1.5mm ply undercarriage plate and glue this assembly to the underside of the reinforced fuselage.
Note that the underside of the lower wing centre section is strengthened at the LE with a piece of 1/8 dowel. The tailwheel strut is sandwiched between two pieces of 3/32 balsa. All the flying surfaces are held in position with rubber bands.
Interplane struts are entirely optional, they are of hollow construction and a piece of shirring elastic is taken through one strut, through the hole in the top wings, down the other strut and the ends tied under the lower wing ie the struts are permanently connected to the wings.
Finishing Ebenezer style models is covered in the accompanying article (pages 26 to 28, this issue) - just remember to keep the weight to a minimum. Balance the model at the rear of the top wing centre section and go fly, but watch the fuel level, the Dart 0.5 cc provides ample power."
Direct submission to Outerzone.
Quote: "Stampenezer: A profile 'Stamp-like' free flight biplane from David Boddington. Probably from around the year 2000 but no date given... The plan was very crammed in to fit the magazine centerfold pages rather than being a separate pull out so I've straightened and joined the fuselage and reorganized it to be a bit more user friendly (this explains the strange angled labels.) All the best,"
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