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KRCM

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91
The testing continues, new learnings and some conclusions being developed.

The plane is now called Taildragger Mk.1, as it rests horizontally for launch, motors vectored about 45 degrees upward, ready to drag its butt vertically, then change to normal configuration. This actually works, as some others have discovered, and it forms the basis for my new project. The existing plane has been my training wheels, and I have learned a lot. I will leave tailsitting to things like my X-VERT and do VTOL in this manner.

 Two more test flights of Taildragger Mk.1 were done over the last couple of days. One was documented with video, which I may post sometime soon.

The first one was done with a hand launch, to sort out any trim issues and have some fun. This thing is an incredibly good flyer, very stable and yet will do some wicked unusual tricks. It will tumble around its horizontal axis if you enable Thrust Vectoring and then haul back on the Elevons. It will do some sort of flat spin, combined with tumbling and who knows what, if you start in slow level flight, pull up a little  bit, crank in full Rudder (differential thrust) hammer the Throttle and monkey around with the Elevons a touch. Yet, when you release everything, it comes back to normal flight.

Yesterday, I did a direct taildragger launch from the grass, It launched OK, but immediately swerved and whumped in. No damage to the motors, servos, etc., but it ripped off the one sponson. A few minutes with the Flypaper Welder, a.k.a. hot glue gin and it should be restored.

This was a successful test! Why? Because I learned something in that 1 or 2 seconds - something that has been at the heart of some difficulties on previous occasions. It is hard, or impossible, to nail the Throttle for launch without inadvertently introducing some differential thrust via the Rudder stick motion. Due to the way in which my system has to be set up (I use 8 Mixes to accomplish all that is required), I cannot implement Exponential on the Rudder function, so it is way too sensitive. Today, I will repair and have already set up a strategy of 3 Flight Modes. In the Launch and Landing FMs, the Rudder function will be disabled; it may or may not be enabled in Cruise Mode immediately after launch until just prior to landing.

I have also concluded that the Thrust Vectoring is too sensitive during Launching and Landing. Again, since this is mixed into Elevon functions (4 mixes required), there is no way to implement Exponential, As with the Rudder function, I want/need full Travel on those channels. So, I have implemented another way to calm things down, one which might be of use to folks who love the play with Flaps. Many are unaware that on the DX9 and many other radios, you can set Servo Speed. I played with different values for the TV servos and am trying 1.0 to start with. So, when you crank in Elevons, theTV servos also respond but slower and therefore smoother. I like it!

So, hopefully one more kick at the cat (or is it the can? I forget), with this plane. Then it may be retired, as I need the hardware for the new Taildragger Mk.2 development. I plan to document the build of this very simple undertaking. Materials and construction are minor components, the real work has already been done and resides within the DX9.

The DX9 programming which is associated with this project is extensive and complex. It is well documented via spreadsheet. At least some of this would be an excellent starting point for someone who wants to try out a twin-engined aircraft of any type, not specifically a VTOL. I may even decide to post the SPM and the spreadsheet documentation.

92
FPV at KRCM / Re: Flying Crash Mystery
« Last post by Flypaper 2 on August 09, 2017, 02:59:24 PM »
Looks like it lost the RF link between the trans and rcvr. There is a spot about halfway through where the pic scrambles for a few seconds too.
Did you get the plane back alright??
93
FPV at KRCM / Flying Crash Mystery
« Last post by Wilf on August 09, 2017, 09:39:56 AM »
I was doing a test FPV flight using a FPV camera/transmitter combination on loan to me from Leading Edge Hobbies.  For the first time, I was using my red and white Canada Day mini-buckle #2 when for no apparent reason it went out of control.  I wasn't that far away, when it went in.  Maybe you can tell what happened from the video.


If yu pause the video and scroll frame by frame towards the end, you will see a few frames of what I saw at the last few seconds. About 27 seconds from the end.


Her is the link on youtube.  https://youtu.be/xQTKfJGmuQM

95
General Discussion / Re: Solar-Powered Recharging Station?
« Last post by ganguy on August 04, 2017, 12:18:52 PM »
A recent issue of the MAAC magazine described this in detail, a club has already done it.
96
General Discussion / Ideas for increasing public awareness of the Club
« Last post by General Malarky on August 04, 2017, 09:28:49 AM »
So I am wondering if it may be worth while investing some effort in to letting the public know we exist. Not only to drive up membership numbers, but to let folks know that this is a place they can bring their families for a pleasant weekend afternoon. I reckon the upcoming Giant-Scale and Warbirds events may be good ways of bringing in some looky-loo's (and additional revenue for the canteen)

I understand that there may be friction with a lot of these ideas and that there is a lot of folks still leery of letting the populace know we exist, after the break-in, but please keep an open mind. If the club is to survive, we need to maintain our growth and public awareness. I am afraid that, within 10 years, the club will dwindle in numbers and self-extinguish.

I would like to point out that our Club's name is "Kingston Radio Control Modellers" and that while an aircraft is prominent in the logo, we are not directly advertising that we are strictly an "aircraft specific" club.

Please post feedback and any other ideas you may have. I welcome an open discussion on this subject.

~ get CKWS to come out and do a segment for their 5:30 show, both prior to the event (to let folks know it is happening) and after (to let them see footage of what we do)
~ Host a regular canteen on the weekends. Nothing fancy, pop/water and BBQ fare.
~ More signage at high-traffic intersections leading to the club
~ Is there an "Official" club social media presence? (someone to post event notifications to facebook, etc? Them youngin's eat that stuff up. It is like the world outside of social media doesn't exist, to them.
~ Provide a "Google Maps" link with directions to the field, on the main page of the Club's website?
~ From my understanding, Leading Edge Hobbies' RC Car Club is without an off-road course. We could open up membership to them and provide space opposite the road from where the Drone FPV area is proposed to go in. (it would also be pretty neat to see more of them RC tanks in action)
~ Finish the FPV Drone area and start letting folks know it exists and we may get more drone-users out flying.
~ Strong-arm family members in to coming out. Host your (as in Club member) family's event out at the field, show them around and how nice it is.
~ Host "Free Trying out Flying" events. How many of us have FliteTest planes that are collecting dust and could be donated to the cause of getting folks interested in flying? Have kiosks with information about various aspects of the hobby, etc.
~ Set up a kiosk at community events at parks in town. Bring down some computers with RC flight sims installed and let folks try that out. Have other various information about the club available.
97
General Discussion / Solar-Powered Recharging Station?
« Last post by General Malarky on August 04, 2017, 08:47:51 AM »
So I got to wondering, the other day; "Could we set up a small solar panel on the roof of the club to charge a car battery to be made available to members as a means to recharge batteries?"

I do not know much about electronics (other than red to red/black to black and that blue smoke is what makes things work and if it gets out, they stop working) but would it be overly difficult and/or costly to set up another solar panel (like the one powering the weather station) to charge a car battery (or two) to act as a power bank for folks to recharge their batteries from? Maybe set up a pair of dedicated outlets?

With more folks flying electric, as opposed to liquid-fueled, I was wondering if there could be an addition to the flying lessons curriculum to cover proper Lipo handling practices?

Pros:
~ More people might come out to fly if they are able to charge their batteries at the field.
~ Ease of access to charging services may result in more planes being in the air.
~ Folks will not have to have their vehicle batteries drained, risking getting stranded (small risk, but still)
~ Possible reduction in noise/air pollution by saving folks from having to run generators (and also save them money)
~ Charging devices closer to the flight line are more likely to be heard and monitored, than those in the parking lot. (I often hear chargers ringing along the parking lot line while folks are sat opposite the clubhouse, oblivious to their chargers. No judgement, just saying it happens)

Cons:
~ Expensive and a possible theft-risk (pretty much the clincher)
~ Difficult(?) to set up and regulate.
~ Risk to the clubhouse of people leaving batteries charging unattended.
~ Over-use/output. Will it be able to supply enough power to meet demands on a busy day?

Any thoughts on the subject?
98
Plans, Projects, Building and Flying Tips / Re: Fun Cub Gear Mount
« Last post by General Malarky on August 02, 2017, 04:42:12 PM »
Marvin and I will get around to assembling one of these, someday... Likely the day after our monstrosity of a landing gear attachment dies (naturally!)

Thank you for sharing, though. We have the plans printed and ready to go, just need the gumption to get moving on it.
99
Plans, Projects, Building and Flying Tips / Re: Hinging of Foamboard
« Last post by General Malarky on August 02, 2017, 04:40:05 PM »
And bookmarked for future reference, thank you for sharing!

Think I'll try this on that Typhoon :)
100
I set up my  2 Cheetah 2208-14 motors for testing. As I cranked them up and down quickly in speed, they sounded great. When I did the same thing slowly and then paused at various speeds, particularly in the under 4000 rpm range which is most critical to my use in the VTOL plane, here was no audible beat and the tach showed that they were perfectly synched! Good little fellows, methinks  ;D

This takes one possible variable out of my earlier concerns that the manufacturing tolerances in ESCs can lead to synchronization issues  ;D
I do think it is a good idea to use the same brand and model ESCs on any twin, if for nothing more than piece of mind - especially if you ever get into re-calibrating one or both of them, either deliberately or accidentally.

Incidentally, I had one good APC 8x4E prop. The other was the same but had tip samage, so I chopped off about 1/4 inch (the Flypaper Method for Propeller Modification/Improvement). Despite this disparity, all went perfectly well!

A couple of precautions:
1. When doing any kind of bench testing with props installed, make absolutely sure that your test system is totally secured and that the associated wires are kept well clear.
 
 2. As you may, like me, be operating a servo tester and a handheld tachometer  and ammeter while checking their readings, it would be very easy to get distracted or careless and ... enough said!

3. Do the testing outdoors. The 60 Hz lights inside will render your optical tach useless.

My test setup is a square chunk of wood large enough to bolt the motors onto, with about an inch or so of clearance between prop tips and clamped  in a Workmate type of stand.
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