I thought you might be interested to see my new slope soarer design which carries on from where I left the hobby in 1980. The repeated design/build/fly/crash, design/build/fly… cycle which dominated much of my spare time in the 70’s, culminated in this rugged 2-channel model I still have 40 years later.
My own design from the seventies
My new design uses the same boxy fuselage construction – full length thin ply sides, soft 1/4″ balsa top and bottom – but instead of 1/16″ all-sheeted wings I’ve copied the open-frame Kloudrider wing construction but with a semi-symmetrical section and higher aspect ratio.
I’ve designed things with ailerons in the past but not flaps. I rather fancied doing both this time but I’ve never really understood why control surface movements try to make different parts of the wing behave in different ways at the same time. So, I decided to go for full length flaperons (which I’ve also never done before) and to try the old ‘sliding servo’ way of mixing the controls which I heard about in the 70’s but never tried.
(By now you’ll have worked out that I’m some kind of weird old-timer who doesn’t want a foamie, doesn’t like programming, but does like a challenge!). “No wonder they used to crash” I hear you say.
The fuselage shape is influenced by the ASW 15 and 17 but I also like the way the 28 is concave on the underside of the fuselage. I also fancied having a go at a T-tail as I’ve never done one of those either. Oh and those little winglet things too – they look like fun. I decided to make the front end pretty big so I can get all four servos in and still have plenty of room for my fingers which don’t work as well as they used to. Anyway, that’s enough waffle for now. Here’s my hand-drawn plan which I’ve already deviated from slightly… (more in the next post):
My new design
Thanks to John for organising a ‘back to our roots’ slope soaring day at Black Hill last Sunday. There was a good turn out and we can see from the photos and video clips posted over on our Facebook group that members had a great time and demonstrated their skills of soaring without any power aids. Stuart Chambers has sent in some photos. Check these out on our Gallery page and the launch photo chosen to head up our home page. Thanks Stuart.
An an update on Johns 1/3 scale K7 build:
Progess on the K7 has been up and down yet quite a few more hours put in. The fin is virtually complete and covered in .4 ply and built integral to the fuz so nice and strong.
I have also finished the rudder which will be operated by closed loop and hinged with Robart Hinges. What has been apparent is the abundance of laser cut parts supplied with this short kit, comparatively little stock wood needed so far, and in the majority of cases they fit firmly together like a jigsaw. I have built nothing on the plan as the laser cut parts dictate positioning….brilliant so far!
Also nearing completion are the 2 elevators, again lots of precut parts. These will be driven by 2 wing servos in the tailplane, never be down that route before. Again the tailplane parts include a ply servo tray especially for this. As this build is so large things are made easier by big pieces that do not break in your hand and seeing what you are doing with older eyes much better. Onwards.
John has sent me an update on his 5 metre K7. It is looking impressive. I can see John looking out for volunteers to help carry this beast to a launch site. I am looking forward to adding further updates to our Gallery.
The 1/3 K7 short kit arrived from Laser Cut Sailplanes sometime in June and a while after that SLEC sent the wood I had ordered in order to begin construction. They were very quick, just a couple of days.
Progress on the fuz was reasonably quick and straight forward after some considerable plan studying had been done. Many of the pieces slot together very accurately but sanding jointing faces to the right angle before gluing was necessary at times. I did have a couple of ‘lining up issues’ but if you have a modicum of building behind you they are fairly easily overcome with patience. I have recently completed the 0.8 ply cladding and the nose skid. PTFE tube is installed in the rear enclosed area of fuz to direct the closed loop cable to the rudder. The nylon covered fishing trace slides easily inside. None of the construction so far is built over the plan, I have the fuz plan hanging from the ceiling near the bench for easy reference, however you do need space for a model this size and I am fortunate to have just enough, the wings will push things! Many thanks to Maggie for looking interested.
Chris, Martin, Mike and I went up L.H this morning. I gathered from the experienced pilots comments that finding a thermal was challenging and conditions lumpy although the weather was clear with a light NW breeze. It was good to see Martin back flying today and I just managed to capture his launch before his craft became a dot in the sky. It is our home page photo for this week. I tried to capture other launches but was too slow for their rapid assents.
Tony who own AK RC Models in Teignmouth has bought Bekra and will be reopening the shop on 4th July. Tony says that the shop has had a major refit and that there will be a greater presence of RC aircraft and cars with much more of the stock on display. Both shops will offer some common items but each will retain their specialisms.
We think that this great news for RC modellers and flyers in our region and we wish Tony all the success in his new venture.
Pete has posted a couple of cracking photos of flying as the sun is setting up at Little Haldon. I have chosen one to head up our home page. Check it out. There are also some more photos of the club’s evening flying on our Gallery page
Hi everyone, actually no one saw the sunset last night as we had by then drained our batteries or gone home. Anyway a beautiful evening on the strip with a light NE breeze. The car park was full and later double parked, a successful meeting I’m sure you will agree. Our illustrious chairman Cliff treated us to some evocative flypasts by his WW1 biplane and Tim maidened his Inside F3J, seen at the last club meeting, remember those, and deftly launched by his wife Carolyn, flew away with no issues.
One success story was the recovery of a model from 30 to 40ft up a tree. The model was recovered without a scratch early this morning by an ingenious pole and hook, very well done by a determined pilot.
Just a few flights of last winter’s KA7 scale glider build by John and the plans for a 5mtr plus K7 have been bought. I hope you are not wishing the summer away too soon John.