Progress slow - had to work and still waiting for fuel tank for pressurized system. Picked up vinyl tody and got aft graphics done. Had to post some progress.
Posts: 425
Joined: 1/28/2004 From: Allen,
TX, USA Status: offline
Skypilot here is some info for you on the full scale Chipmunk (If that is what you are looking for?).
Bombardier Aerospace which is a de Havilland Canada subsidiary have not manufactured the Chipmunk for over more than 30 years. Bombardier at the Canadair (which began its life as the aviation division of Canadian Vickers) plants in Montreal at Dorval manufactures the Regional Jets and the CL-415 Waterbomber, as well as supporting the Twin Otters, and the Dash 7/Dash 8 series modern transport planes.
The de Havilland Chipmunk is a tandem two seat single engined training aircraft, and was the standard primary trainer for the British military though most of the post-war years.
Designed to succeed the de Havilland Tiger Moth biplane trainer, the Chipmunk flew for the first time at Downsview, Toronto on 22 May 1946. It was the first indigenous design of de Havilland Aircraft of Canada Ltd, the main designer was a Pole Wsiewolod Jakimiuk. The prototype was powered by a 108 kW (145hp) de Havilland Gipsy Major 1C
Two were evaluated by the Aeroplane and Armament Experimental Establishment at Boscombe Down. As a result, the fully-aerobatic Chipmunk was ordered as an ab initio trainer for the Royal Air Force. Prince Philip took his first flying lesson in one in 1952. The Royal Canadian Air Force also adopted the Chipmunk as their primary trainer. British Chipmunks are notably different from Canadian ones; the latter have a bubble canopy, while British examples have the flat-panelled sliding canopy.
The RAF received 735 Chipmunks manufactured in the UK. They initially served with University Air Squadrons. A few Chipmunks were pressed into service in Cyprus on internal security flights during the troubles of 1958, and some were used for covert reconnaissance operating out of Berlin. They were still in service for ATC Air Experience Flights until 1996 when they were replaced by the Grob Tutor. The last two Chipmunks in military service are operated by the RAF Battle Of Britain Memorial Flight, to keep its pilots current on tailwheel aircraft.
Downsview built 218 Chipmunks, the last in 1951. 1014 were built in Britain. 60 Chipmunks were licence-manufactured from 1955 in Portugal for the Portuguese air force. Other users included Burma, Ceylon, Chile, Colombia, Denmark, Egypt, Eire, Iraq, Israel, Jordan, Lebanon, Malaya, Saudi Arabia, Syria, Thailand and Uruguay.
From the 1950s onward, the Chipmunk became a popular civilian aircraft, being used for training, aerobatics and crop spraying. Most civilian aircraft were ex-military.
Role Basic trainer Crew 1 or 2 (Instructor and student) First Flight May 22, 1946 Entered Service Manufacturer De Havilland Dimensions Length 25 ft 5 in (7.75 m), Wingspan 34 ft 4 in (10.47) m Height 7 ft (2.1 m) Wing area ft² 15.98 m² Weights Empty 1517 lbs 646 kg Loaded 2014 lbs 953 kg Maximum takeoff 2200 lbs kg Powerplant Engines 1 x de Havilland Gipsy Major 8 Power 145 hp 108 kW Performance Maximum speed 138 mph 222 km/h Range 280 miles 445 km Service ceiling ft 5200 m Rate of climb 900 ft/min 274 m/min Wing loading lb/ft² kg/m² Power/Mass hp/lb kW/kg
NOTE: Dynaflite used to manufacture a kit version of the DHC-1, which I believe they have discontinued
For all you Chipmunk enthusiasts out there, check out the official Art Scholl website http://www.artscholl.com
Posts: 425
Joined: 1/28/2004 From: Allen,
TX, USA Status: offline
Hey guys I just finished a GP Super Chipmunk using a Saito 1.50 and it only needed 7.5 oz. of lead mounted on the motor mount, plus a Harry Higley Heavy Hub (which looks quite scale like). The engine is mounted inverted, and the stock muffler exits out the back through the fusale cutout at the bottom of the firewal with the help of a Dubro silicone extension. I estimate the Saito 1.50 should pull this puppy quite easily. An Enya 1.55 should have no problem either, but I assure you there is no way that you are going to avoid cutting up the cowl. A Saito 1.80 or a MVVS 35 should pull the Chipmunk ballistic on the upline, with unlimited vertical, and may need less lead to balance than the smaller engines. Although this will detract from the scale flying characteristics. One of the most important points noticed by judges in AMA Scale Competitions is "SCALE" speed and performance. That means one should not expect an Eindecker E-III to cruise at 200 MPH straight up for one thousand feets. Most scale pilots practice a lot of throtle control to maintain their speed down when they overpower their planes.
The reason for this bird being tail heavy is due to the glass fuse (being heavier than balsa), and some very generous size horizontal stab, which should provide plenty of pitch stability, plus solid elevator authority. High rates settings for the elevator are only arround a max of 1" of travel . If this chipmunk flies like others I flown (Goldberg , World Models) this must be dream to flight. Roll rate I expect to be quite impressive since the ailerons are close to scale in surface area, and they even have the extension tabs at the tips. Please be aware this is not a 3D plane, but a very good scale rendition of the original, and after all is said and done a perfectly executed Cuban 8, or Lomcevack are much harder to perform than most 3D tricks. There is a big difference between Scale Flying Aerobatics and 3D.
Posts: 79
Joined: 8/15/2002 From: Grahamtexas, USA Status: offline
AirTech.......I will be installing a saito in mine as well.......could you please take a close up pic of the front of the cowling area of how it is cut out? and also did you install the stock fuel tank or did you use a larger one?
Thanks
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Bill Martin AMA 639144 If you think nobody cares about you in life; try missing a couple of payments!
Posts: 425
Joined: 1/28/2004 From: Allen,
TX, USA Status: offline
flynut007 the best way to describe the way to cut the cowling is as follows:
1. I use a piece of Mylar purchased from Hobby Lobby (the hobby projects store, not the RC web store), or any place that sells fabrics i.e. JoAnn Fabrics. This is a fairly transparent plastic, which is used for cutting permanent sewing patterns.
2. After installing the motor mount and the engine (follow the kit instruction closely) securely tape a piece of this material to the fuse, making sure to extend aft of the cowl rear edge (behind the hot air vent in the bottom of the firewall).
3. Trace the outline of the rocker covers including the pushrod tubes. Be aware the cowling at the very front has a sharper angle, so you must bend the Mylar around the top of the engine. Make the outline slightly smaller to give you some leeway when cutting, and cut the layout on the Mylar without removing from the fuse.
4. Remove the engine from the mount, and cut the Mylar outline by using a piece of wood for a cutting surface. Make sure not to dislodge the Mylar from fuse.
5. Now install the cowl more or less centered in the final location by following the Kit instruction. Try to be as close as possible to where the actual center of the motor shaft will be located, and tape it in place. Bend the Mylar across the front of the cowl and trace the outline of the cutout on the cowl by using a soft lead pencil. NOTE: Permanent Marker Ink (Sharpie, etc.) will be very hard to remove from this type of paint (possibly two part polyurethane or epoxy). You will need acetone to remove ink from this paint. For the Saito 1.50 this pattern will be located around the carburetor inlet hole.
6. Now comes the fun part. With a 1/8" bit in your Dremel cut a series of holes about 1/16" on the inside of the outline. You may use the drill bit to connect the holes and remove most of the material. Then with a small drum sander, at a slow speed carefully, and with lots of patience smooth out the cutout line. Test fit and continue sanding, and enlarge the hole until you get a good fit. I try to leave a small gap on the sides to make sure the engine does not rub against the cowl. And I like to cutout the gap between the rocker covers to let cooling air around the top of the cylinder.
Good luck with your Chipmunk, and I will try to upload a close up of the rocker cover hole as soon as I can.
Posts: 425
Joined: 1/28/2004 From: Allen,
TX, USA Status: offline
The battery (a 5 cell 2400 mAh NimH) is mounted as far forward as possible, under the fuel tank. A little tricky to install in place when the plane is upside down, but it fits through the large round hole in the second former. Make sure to use plenty of foam around the tank and battery. FYI there is also an on-board glow driver Sub-C battery behind the Rx battery under the tank.
I agree on the smoking Lomcevack, that will look impressive. Does anyone knows whatever happened to Don Harris. He used to build these 4 stroke smoker mufflers that were awesome. Hooked to one of the new volume control pump systems the 1.50 will produce weapons grade smoke screens. I will like to know if anyone have tried the smoke mufflers from Davis Diesel, are them worth the money?
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RE: New 81" GP Super Chipmunk - 
