Saturday, September 29, 2007
Friday, September 28, 2007
The start is from 12h00 onwards so if you want to see the gliders and lots of action, then get there at around 11h00.
Tuesday, September 25, 2007
I've been very busy finishing off a rebuild of my Mini-Phoenix. So, to keep some variety on the blog I'll write a short story of the history of this little electric model.
Problem solved but the Natal Nats were two weeks away and it was time to move up a notch and have a bash at a brushless motor setup! Picked up an old Walkera heli inrunner that fitted without any modifications to the mount, had a 10A controller lying around and invested in some good FlightPower 2 cell Lipos. Added a mean little Cam 8x6 prop and blew all the indoor plants away in the lounge bench testing the rig.
Above left: At the Nationals - round 1 and ready to go. Note the determination and confidence on that face. Above right: Great climbout for first and final flight. Climbed to a spec in a few seconds and then ... nothing. No control and straight down she came, filtering throught the pine trees before planting into the hard Natal soil.
Problem was obviously (in hindsight) the little 10A controller. It blew itself to pieces with tiny components and solder splattered all over the inside of the fuselage. Structural damage was not too bad but I was never happy with the design and decided to redesign and rebuild - of course it would have to be balsa open structure and the purple finish!
It has taken a few months but now nearing completion as the following photographs show:
Wing underside now covered - found some lovely deep yellow SolarFilm and mixed it with a bright purple - sure to brighten up the sky on a dull day. Sexy F3J wing and tailplane shape evident.
Decided to go almost full house on the wing moving surfaces. And why not with the small and reasonably priced servos available now? One servo driving both flaps from the centre and a servo for each outboard aileron.
Thoroughly enjoyed building the wing joiner system. Three piece wing has bolt down flat centre section with slight dihedral on plug in tips. Pine dihedral joiners and aileron servo mounted ready for connecting rod and then top wing covering.
Still a bit of work to be done on that fuselage but all burn marks will have to stay. Wing mounting area cut down and refilled to fit new wing section and extra layer of cloth added ouside behind the wing where fractured from the crash.
So far so good. Will post more when finished and ready to fly ...
Friday, September 21, 2007
I had my pdf plans printed out full size and being a patient sort of chap decided only to start the next day, here is the build thread thus far.
I marked out a traced template and glued together some scraps of blue foam , I no longer have big pieces so this will have to do.
Using P/U glue from alcolin I glued the pieces after wiping them with a damp cloth, the P/U glue needs moisture to cure, it tends to foam up and this is great as it fills gaps, once dry I roughly cut to shape with a hot wire bow.
I have shaped the tail fin and attached it, at this time I have decided to layup some thin cloth/epoxy and filler and finish off to a sparkle before pulling off a mould.
How is yours getting along???? Evan , Piet , Robert and many others whose names escape me, right now.
Wednesday, September 19, 2007
PS I have my own Jart plans, watch this space.
PPS better still why dont you also get some, they're free
Monday, September 17, 2007
Total launch point height from the flat fields near the farm house is 70m: 30m slight rise to the base and then 40m of full on steep slope (Google Earth stats). Red spot is the launch ledge and the photo view is from the green spot. BTW – check the very bottom left of the picture: The yellow spot marks the flat field that we propose flying the HTL final on the 2nd December.
But be warned: this is not a slope for sissies! You first have to walk from the farmhouse to the slope, then climb the slope face – and you have to land at the bottom!
over a big valley scattered with farmland and small dams.
Wind was a little gusty at the top so I opted for my little elliptical model which performed so well at Volksrust last weekend. Big aileron throw gives great manoeuvrability and helps to get out of trouble quickly - but sometimes gets you into trouble just as quickly! I bought this model from Charl Randall who says it’s a Tito but I can’t find any info on the web – anyone out there seen one before and have some info on it for me?
After some great flying with the swallows (very welcome back), all that’s left is to land it down the bottom - watching carefully for the shadow! And then the long trek back to the farm house.
Sunday, September 16, 2007
Mark had fortunately put two tow hooks either side of the fuselage, high up the side much closer to the wing. This is a good idea with big fuselages when the wing sits near the top of the fuselage. It helps prevent a lever action from pitching the nose upwards when under pull from the winch.
It's GO! GO! GO!! And suddenly you are all full of excitement. The adrenaline has your heart pounding and you knees knocking and you feel as if you are on top of the world!"
Beautiful launch! Three frames and about 10 meters, it had lift under the wings and it was flying. Straight and true!
.........IT FLIES !.........
After some initial trimming, the nerves settled down a bit and it was soon in a thermal and climbing away. It is amazing how easily these big ships fly and catch thermals. They are just so graceful and really look the part.
After about 30 minutes Mark decided to bring her down. While there was still enough height the breaks were deployed to test them and she slowed down without any pitching. Perfect!
Then the landing!
Fly around and set up for a smooth approach................
For those of you wondering what GBAF means.
It's GO BIG AND FLY!