I’ve just returned from the flying field after what has been a delightful flying experience. You know when something is right, when it flies right, is well mannered and stress-free. A model that has been designed for electric flight doesn't need to be built to withstand the same vibration levels as for i.c. Not that this model is in anyway flimsy. It is perfectly robust in all the main areas that matter
The entire kit contents are of very high quality. The cowl is sprayed to a showroom finish. The glass-fibre components are in epoxy and are extremely light. The wheel spats are seam free. Hardware pack is perfectly satisfactory. Sadly the wheel spats will have to remain off on my model due to the rough old ‘patch’ I fly off. For those with quality flying facilities, they can only serve to enhance what is already a very attractive model. The undercarriage is the ‘Torsion Bar’ system and all the mounting blocks and holes are already built in to the wing
The fuselage has a removable top deck secured by peg and magnets. There is a long mounting plate for the battery. This allows a range of battery sizes to be utilised and the C of G can thus be adjusted fore or aft. I used a 5S, 4500mAh Tornado Pro and needed no lead. Plenty of room here for all the equipment you are ever likely to need
The wing panels are fully finished with servo mounts already installed. It is necessary to fit the aileron using the standard ’furry hinges’. The servo wiring should be installed before joining the panels. A praise-worthy point here is that the wing bolt holes have already been drilled at the factory. The blind nuts have also been fitted to the wing saddle in the fuselage. Having glued the panels together, and offered it up to the fuselage the wing bolts aligned perfectly with the blind nuts - that’s precision quality for you.
Hyperion offer a complete power train for those that wish to purchase it. This way you will be assured of a successful outcome. It is a highly commendable idea for the manufacture to offer a ’one stop shop’ for fliers especially new to electric flight. For me I use what is to hand. I have a Turnigy Aerodrive 50-55 rated at 1580 watts, from the new SK series, fitted with oversize Japanese bearings and as smooth as silk.
The motor and speed controller mounted neatly to the front of the fuselage. The speed controller screws up underneath in the exit airflow space at the bottom of the cowl. I use the Sentilon 100 amp because I have one, its cheap, the heatsink is bolted on (not held in place with heatshrink!) and it works well. The fixing lugs make it easy to install. It is possible to cut a small triangular panel out of the film covering at this location and route the battery wires back inside. Makes a neat job. There is the correct engine side thrust in the firewall and this is also moulded into the cowl.
The equipment bay is very user friendly. If you have a lighter battery, it can go quite a way forward, although it might be a little difficult to secure without fabricating some sort of partial battery box. My Tornado 4500mAh battery allowed me to fly for 8 minutes and land with 30% still ‘in the pot’. When installing the top hatch, you need to check that the magnets are actually touching, by using a thin strip of paper. Mine weren't and I had to adjust the canopy screw holes that I had drilled.
The tail end bits fitted well. The tail wheel steering shaft comes up through the fuselage to engage with the rudder. You have to bend this shaft ‘in situ’ at 90 degrees which is not the easiest thing to get right. But it all ended up ok with no tears shed. It is necessary to remove the covering over the areas to be glued The slots for the tail and fin are spot-on.
All the exit slots for the push rods are pre-cut and I encountered no difficulties setting up the linkages to the rudder and elevator servos. Throws on all control surfaces were as per the manufacturers recommendations
FLYING THE SUPER CHIPMUNK
The model takeoff on our ‘ratty’ old patch requires a ‘fist full’ of up elevator and a gentle hand on the throttle. With around 1500 watts on a six pound model, it didn't exactly hang about. It's what you need on a serious aerobatic thoroughbred.
It is a very visible model in the sky. This time of year the sun can get a bit low in the late afternoon, I had no difficulty seeing what the model was doing. The trims hardly needed anything radical to get it ’hands off’.
I flew straight & level in a slight climb for 30 seconds without any control inputs. I had exponential Available, but although the controls were sensitive without it, it cried out to be flown this way. Sort of said to me ‘’you gotta sharp plane here, boy, fly it like a man!’’ And I did , she would cruise at well below half throttle. With such nice controls you could throw a lazy flick roll and it was all so neat. Stall turns were a doddle, (and I’m not that good at getting them right). Spin and recovery were totally predictable. Inverted flight needed a little down stick, but not all that much.
Having a good reserve of power means you can turn it on when you need it and that huge fuselage side guaranteed knife edge performance. With such a light wing loading, landings were going to be very gentle. The torsion bar bent wire undercarriage should prove entirely adequate for most flying sites. I have ended up ‘raking’ the legs forward a bit as they are getting a bit stressed, but I say again that for most flying sites, they’ll be fine.
|Hyperion chipmunk 70|
still available? By Eoin
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