|Jul 24, 2012, 06:40 PM|
supermarine S6B T. Nijhuis design
For those that are interested I thought I would start this and see what happens. I have almost finished building my first scratch build RC plane. Its not the first plane I have started but it will be the first one I finish.
The plans call for a 46 glow engine, but I have decided to go electric. I have an OS 750kv motor with a 12x8 prop and a 12x10, (see which is better) running off 4S 3600mah battery. AUW will be around 3kg.
I have custom made the floats from fibreglass (plans show balsa construction) and the fuselage is balsa and glass.
At this stage its 90% complete, with 90% still to go!
The day came and it was time to get it in the air. Have a look and read my first flight review and some more pics.
Video now up in the blog.
Well all good things must come to an end. Flight #2 everything ready to go, throttle up and off she goes along the grass. Lift off, nose up, severe roll to the right, over correct, roll to the left, over correct, roll to the right, stall and nose straight into the ground from about 30 feet up..
Damage report: pretty much a complete right off, engine and electronics salvageable as with the wing. One float OK. The rest hmmmmmmm.
To make the rebuild easier I'm now forming a plug for the fuse so I can make it out of Fibreglass.
Finally got around to checking to see if the motor and electronics were OK. Good news all OK. Prop shaft is straight and no vibration, just broke the prop. One good thing about having long floats sticking out the front I guess.
|Jul 24, 2012, 06:51 PM|
some more pictures
|Jul 24, 2012, 09:34 PM|
Thanks Jp for taking the time to do the blog.
Love the photos and the build; hope to talk to you about it one day.
|Aug 19, 2012, 02:38 AM|
Well the day finally came, not quite ready but good enough to have a go any way. After some taxiing trials on the very wet grass and submerged cricket pitch and a little high speed hop (that proved flight was possible) And the thought that its got to fly some time.
I had spent most of yesterday finishing and fitting the ailerons and servos, getting the battery sort of secured and balancing the plane. I know I could keep fluffing around forever finishing stuff, but I woke up today to some overcast sky and a slight breeze. Off to PP first thing to find a few of the regulars that have been following my progress with this project. After a few words the taxiing trial, I thought it was time to give it a crack.
There are over 200 hrs in building this thing, as its the first scratch build I have done and mostly finished, and several hundred dollars in materials and components. I was nervous to say the least. Time had come, no turning back now. Plenty of people standing around offering encouragement with their cameras at the ready for the before and after shots.
Throttle up and away she goes, take off was pretty messy to say the least, (don't think I'll post the video) but it was up and flying. several clicks of down trim as the nose kept wanting to go up, even with the CG almost all the way forward 73mm. Did quite a few circuts and some quick stall tests, no really bad vises. In a stall it just dropped the nose. The hard thing was getting used to having 30% of the weight of the plane hanging under the wing and also creating a ton of drag. The floats add quite a pendulum effect, so turns need to be smooth and flat. I found it was very easy to get the plane porpoising, also need to add some expo into the controls.
That was all good, now time to land. Coming in on approach a bit high, luckly, as the wind had done a 180 on me. Go around again. Throttle back but she just wants to keep going, hmmmmmmmm. Go around again, throttle back and push the nose down. Contact and back on the ground with a couple of little bumps and hops. Still in one piece and a very relieved pilot
There is still a bit of tweaking to go, tidying up the lead on the front of the floats, painting the floats, etc, etc.... Then the challenge, real water instead of water logged grass and puddles.
Thanks to all those that have helped and given advice.
|Aug 19, 2012, 03:36 AM|
still f mad i missed it looks great j.p you did a great job mate.you should be proud of youself!you've put heaps of hours realising that project and seeing it up must have been very satisfying!good job mate!
|Aug 24, 2012, 08:55 AM|
Joined Mar 2009
Wow... I have been working on this for ages.
Adrian Whiter, treasurer of our club (Yarra Valley Aeromodellers) built this years ago. His finished model weighed 9 Lb or thereabouts. The maiden was a disaster. Write off.
He rebuilt it and it now hangs in a mates garage.
I have been lightening mine where I can. Going to I/C power it.
Where abouts are you JPM1?
|Aug 24, 2012, 09:08 PM|
Thanks for looking me up again. I fly at the Police Paddocks off Stud Rd. Mine ended up at an AUW of 3200gms. Not sure what that is in the old measurement.
I took some of your example with the wing construction and ended up covering the wing in flim rather than compltely in balsa. It flys well but I still need to trim it properly. The floats do add quite a pendulum effect. I also need to dial down the elevator and ailerons as I had no expo and was flying straigt off the sticks. I tried to contact Tony Nijhuis, as I have bought some of his other designs. I haven't heard back from him yet. I would like to know what he suggests for all the control measurements etc....
I look forward to seeing yours finished and to compare notes.
|Aug 29, 2012, 05:45 PM|
video thanks to Dale. The first part was taxiing around to get a feel for it. The take off was pretty messy, but once up in the air it flew quite well. Landing not much better than the take off, but it's still in one piece!
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