|Electric Ducted Fan Comes Indoors!|
This model, together with a Mig 15, is available from the USA - see web site at www.fan-tasticmodels.com. They retail at $70 but shipping to the UK might be a bit extra. If you are interested, drop them an e-mail, my e-mails were responded to within 24 hours; they even shipped the model to my hotel whilst I was in Chicago.
Both models have been designed around the amazing miniature fan unit from GWS (GWS 50) and it is a perfect fit in the model. The kit is moulded foam, similar to the material in chip-trays. The fuselage shells came pre-joined and the wings, tail and fin need to be cut out from their sheets; all the components are exceptionally light. In addition there are a number of elegant ABS mouldings and a very lightweight clear canopy, which can be fitted out with the supplied pilot's head/shoulders. There is some wood included in the kit - just for the traditionalist; the tiny horn for the all-moving tailplane and the servo mounts that are laser cut together with the piece of 1/8th dowel for the wing leading edge. These servo mounts push into ABS mouldings that are then glued into the fuselage - very nifty idea. There is also a sheet of high quality stickers to apply to the finished model and these set it off a treat. Topping it all off is the fine instruction booklet which contains numerous photographs and does a grand job of explaining the construction process
The model is a joy to put together and incorporates some very crafty ideas that are real weight savers; some of these will eventually appear on many indoor models I'm sure. For construction I used the left over glue from the GWS Tiger Moth; the instructions suggest using very small quantities of epoxy, but remember this is like adding lead to these models and the secret of good performance comes from making every effort to keep the weight down. I read somewhere that each additional gram reduces flight time by 1 second. I'm not sure if this is true but it is a good maxim to work to.
An alternative would be Zap-a-dap-a-goo, which sticks anything to anything; remember whatever you use, go sparingly and check compatibility on a piece of scrap foam first. I promised Pete (the face behind this web site) that this wouldn't be a traditional kit review as the instructions are perfect and are very through. However, I will highlight what I thought were the novel aspects of putting the Sabre together.
The wing leading edge is 1/8th dowel. This is simply attached to the foam and extends through the fuselage sides where an ABS moulded clip snaps onto them and anchors the lot in place; the wings are then permanently attached to the fuselage with your favourite glue. Niftily the strap to hold the battery in place hooks around this clip, very well thought out and does the job perfectly.
The tailplane is all-moving and this is achieved by bonding an aluminium tube to slots in each half; the characteristic slight v-tail of some versions of the Sabre is then easily obtained by gentle upward pressure on the tube.
The ailerons, which I hinged with diamond tape, are controlled by a closed loop system (all of which is supplied in the kit). This is a very clever way of getting these to work perfectly with no hassle and again no appreciable weight gain.
The fan unit is attached to a moulded duct with masking tape and then pushed into the fuselage as far as it will go. It is then sealed in place with masking tape - hence easily removed with minimal disruption if need be in the future.
Loads of detail is moulded into the foam so that when you spray it and add the stickers the model comes alive. I sprayed mine with Humbrol silver enamel, which is foam safe, but if in doubt check on a bit of off-cut first.
Putting the Sabre together gave the impression that all aspects of the construction process had been very well thought out by the designers.
The radio components I used were as follows: -
All of these are readily available at most local model shops and are reasonably priced. The location of these as indicated in the instructions resulted in the CG being spot on. Control movements were set up as per the instructions. The total all up weight ready to fly was 179g (this is less than my Tiger Moth which came out at 210g), all good signs prior to the first flight.
As our indoor season has not started yet I chose a calm day (wind 7/10 mph according to the Met Office) for the first outing. On the bench the fan unit appeared to be putting out adequate thrust and from a gentle hand launch the model went away with authority. Minor trim changes resulted in the model flying tight circuits and figures of eight at low altitude. This model will fly exceptionally well indoor, I have no doubts about that but the elevator trim will likely alter from the outdoor setting if the experience with the Tiger Moth repeats itself. Subsequent flights have shown that a gentle hand launch is best, no need for javelin throws. Flight times are in the region of 3 to 4 minutes and the speed is more than adequate, not like a turbine model but enough to look impressive.
To date I have had 12 flights on 3 different occasions and can't wait to try it in the sports hall. It has gone well at all times and there have been some exciting moments. When I taped the aerial along the wing, to hide it away a bit more, I was getting some horrendous glitches. My advice is to leave it dangling as there is no problem then. Two of the launches have been exciting; one was with the nose pointing 45 degrees down (excuse - hand stuck to model due to glow fuel on fingers) and the other at knife-edge (excuse - slipped on grass because the field had just been cut and the clippings not collected). The fact that I got away with them both speaks volumes for the model - it is a real cracker and never fails to generate attention.
Several people have tried to buy it from me there and then, having seen it go, which is always a sign that you have made a good choice of model.
COMMENTS TO ACCOMPANY
Indoor Flight Report
Luckily their was no damage to the model, and the Sabre was up and flying around again straight away.
There was no trim change between indoor and outside and once away from a hand launch the Sabre could go around very well at half throttle. This allowed flight times of 5 mins plus which is more than enough as the level of concentration needed is a little more than that required with the GWS Tiger Moth. I managed about 6 flights in total and it generated a tremendous amount of interest.Space needed is a minimum of 2 basketball courts - any smaller and it would be a real challange.
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