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KRCM

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Topics - Deerslayer

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16
General Discussion / Inside a Drone Factory
« on: September 19, 2017, 08:52:09 AM »
Another great item posted on the FLITETEST forum. This also gives a great insight into what one of China's great cities and manufacturing hubs is like - not really what many folks imagine.

https://youtu.be/jHRb5OkN2E4

17
This will pull together and replace a couple of items which may be of help to someone trying to figure out how to post their product.

18
Plans, Projects, Building and Flying Tips / MOVED: Aerobatics
« on: September 14, 2017, 08:15:50 AM »

19
Lost And Found / Introduction to Lost and Found
« on: September 07, 2017, 10:57:48 AM »
Please post a description of the item(s) in here.

In the case of a lost aircraft, tell us what kind and colour the plane was and  try to describe landmarks which may enable someone else to track it down.

For example:
"Standing at the Clubhouse door, look toward the second Flight Station. I think the plane may be a long way out, past the first tree line. We saw it go down".

OR, perhaps:

 "Joe X. saw it go down from where he was standing." (That way ,Joe can point out to others more specifically what he saw).

21
This is a new but widely used and well respected Transmitter targetted for multi-rotors. I bought it as an experiment to see if it would work on airplanes. It did the basic job but lacked certain features that I require. (It looks like there are some Open Source efforts underway to modify it for more general purpose use, but no updates yet.)


https://www.rcgroups.com/forums/showthread.php?2761109-Turnigy-Evolution


- Evolution Transmitter, with originally included Receiver
 - 2 additional receivers
 Original value, over 100$CDN.
 Make a reasonable offer!

22
General Discussion / 2017 Record ClusterHuck
« on: August 28, 2017, 05:48:12 AM »
Lots of posts surrounding the HuckFest this past weekend! In here is the video of the ClusterHuck - new record, 14 in the cluster! KRCM was well represented by Brad, see if you can spot his plane in there ...

http://rccanucks.com/showthread.php?2073-The-Great-Canadian-Huckfest-2017/page35

Wouldn't it be fun if we could entice the group to come down here some weekend? Folks would be able to see and learn about top notch 3D and regular sport flying, as well as the intricacies of the most advanced technology in our sport from some of the best in the field.

23
General Discussion / Real action!
« on: August 27, 2017, 08:35:28 AM »

 Now, that's what I call FUN!

https://youtu.be/T62WIbIC3lY


24
General Discussion / STEM
« on: August 21, 2017, 12:11:38 PM »
The Filtetest guys are really  great bunch and have brought some terrific ideas and products to the RC world. Perhaps more than any other individual or group, they have been responsible for attracting and keeping more young people in particular.

STEM  (Science, Technilogy, Engineering, Math) is being emphasized in schools in Ontario, as well as in may other jurisdictions. The future - of society and our hobby!

The following video is a great example of what the FT guys have been up to and what young students can accomplish. Enjoy!

http://www.fliteteststem.com/

25
Buy, Sell, Trade or Give Away / For Sale - Senior Telemaster
« on: August 20, 2017, 07:32:44 AM »
 This is the large version of the classic Telemaster. It is legal for, and has been flown at, several Giant Scale events.

 An extremely docile aircraft, yet it is fully aerobatic. Takes off and lands in almost zero length.This would be an excellent entry level plane for anyone wishing to try giants.

 It was built from a kit, with several modifications, including 2-piece wing and detachable tail for easy transportation in a small car. The design calls for a .61 size engine, but this one sports a dynamite OS 120 4-stroke engine (could be easily converted to electric). It has fully independent Flaps and Ailerons, plus a servo and dual purpose release mechanism suitable for banner or glider towing. Candy drops? - it's a natural! All servos are high quality, high torque metal gear. Any radio of 6 channels or more can be used (receiver is not included in this sale).

It flies well on wheels or skiis (snap-on Coroplast ones provided). Rear fuselage has been strengthened in critical area for possible float attachment.

For $200, it is yours!  ;D

26
 Thank you, Wilf, Harold and Terry for your assistance during a very interesting series of tests. Here is the product of your efforts - the Ups and Downs of flight testing this bird. Having video is very useful, as I can run it in VLC, slow motion and stop it, to see what happens during the most critical second or two of a launch, for instance.

 There may or may not be more flying of this machine, as it has undergone some sessions with the glue gun and the foamboard itself is getting sort of punky due to the paper detaching. I think that we may have gone past the Flypaper Golden Ratio of hotglue:foam, so this may be the end of my work with this one. The next one is radically different, still a taildragger wing, twin-engined, vectored thrust but much simpler. It will be much easier to get going, due to my experiences and learnings to date, plus the extensive programming of the DX9 which will be essentially unaltered for the new machine.

 Meanwhile, rumour has it that there may be one of these beauties incubating in the fevered mind of Flypaper, or it may already be on the operating table! Go Gord, Go!

So, here is the whole sordid affair:

https://youtu.be/YebpBz2wan4

27
FPV at KRCM / New FPV Camera from Lemon
« on: August 15, 2017, 09:39:45 AM »
 Very interesting! This was just announced.

 For those who are not familiar with Lemon, they have a lot of great products. I have a number of their DSMX receivers, receivers with integrated stabilizers including the latest Stab+. Testing done by outside RC and electronics experts have shown them to be unmatched in range. A number of others in the Club are also Lemon users.

 The designer is from Vancouver and has terrific support, which he reciprocates, amongst the Lemon user community. He normally provides samples of the latest items to a select few to thoroughly test and document. The Lemon manual for the original stabilizer and the Stab+ were both developed by a a pair of flyers - one in the Ottawa area, another in New Zealand - and have addressed all comments and concerns throughout the lifespan of the products, with the developer's total support. In fact, when you order one, you are provided with the link to that manual and other information on RCGROUPS.

  This tiny FPV setup will undoubtedly live up to the standards of all previous offerings. (I already have too many things sitting in boxes, awaiting installation in carious flying things, so I hope that someone else bites on this so I can at least see one!) 

http://www.lemon-rx.com/index.php?route=product/category&path=80

https://www.rcgroups.com/forums/showthread.php?2940390-The-official-Lemon-4-1g-VTX-Camera-thread#post38105806

29
 Have you ever seen a YouTube of an aircraft (or anything else, for that matter) and wanted study or to to build something very much like it? Perhaps this can help:

You may just want to see some detail about how the structure, or some component or subsystem, is built. Or, you may want to view various control actions in stop motion. Then again, you might just want to get some approximate measurements, such as the wing's aspect ratio tail and nose moments, powerplant placement, or to figure out what airfoil is used.

 There are several tools which can make this happen, and they are FREE! You can used them from a PC, an Android tablet or Android phone.

 One good YouTube downloader that is available is http://www.clipconverter.cc/  which takes the YouTube URL and converts the video online to your selected format (I selected MP4) and saves it to your device.

 Now that you have an MP4, you need a good viewer.

A few years ago, I discovered VLC. It is available free for PC and Android. I initially put it on my desktop PC, a laptop PC and my Samsung Note (Android) tablet and eventually on my Samsung (Android) phone. It is a terrific piece of software! My first use was to take  the videos which my Mobius camera had recorded aloft on various models and simply view them. You can alter the speed of playback, pause at any time, grab a frame as a snapshot. etc.

So, now that you have found a really good YouTube that depicts the various things that interest you, do the conversion to MP4 and bring that result up in VLC. Run it, slow it down, find suitable frames, snapshot them and print them out.

If this all works out well, you can sit down with a pencil and suitable drawing instruments and begin to mark up and scale the drawings. In the case of something I am working on right now, I wanted a plan view, side view and some details on vectoring motor mounts of a VTOL plane. As well, I ran through in slow and stop motion certain aspects of his flight to see what he was doing in the combining of elevons and motor vectoring during takeoff, cruise and landing.

Even if you are not in the building mood, this overall approach can provide some interesting information on various things. For instance, every once in awhile some "amazing" video shows up which purports to show an unbelievable action  :o. Wow! The internet goes bonkers, the thing gets passed around a gazillion times and the crowd is awestruck  :o  :o . Sort of like some of my, and Flypaper's, incredible achievements in aviation?  8)) However, if one cares to take the time to grab off said video into an MP4 and run it through VLC, the fakery can be easily spotted. One that comes to mind from awhile back is the large aerobatic airplane losing one wing and yet landing sideways :o :o :o :o (Yah, like that could really happen ...  :(



30
Let me tell a tale or two and offer something that may help someone else.

I have limited experience with twin-engined planes. My first was a Corroplast contraption, inverted V-tail, two OS LA15 engines. I created this to learn something about twins at lowest possible cost and minimal pain. It worked out very well, I spent many hours flying and hovering my effort. All I had ever heard about twins was that it was SO important that they be synchronized at all times! Well, it ain't all that easy, even if you break out 2 brand new engines, run them a couple of minutes (my normal break-in procedure), strap 'em onto somethin' and go flyin'.

In this case, the engines had very different histories. So, I fired them up and began to play. I could get them to fast idle reasonably close and even reach near synchronization at high end. I could either try to get them matched in mid-range or at the other two ends, but not across the whole range. It turned out to be of little issue, as I had designed the machine with great rudder (ruddervators, actually) authority in order to strongarm out of any unwanted yaw due to mis-matched power systems. It turned out that even that wasn't a big deal. What happens is that the engines seem to approach closer to sync under flight loading.
Good stuff!

On to electrickery! My first twin electric was/is my own design - Tailsitter Mk.1 and Mk.2 The concept is a VTOL flying wing with twin engines, not using a Flight Controller, just relying upon my DX9, brute force and dumb luck to get the job done.

In my flight testing of these 2 Tailsitters, I had very hairy vertical takeoffs, and hovering or vertical landings were way beyond their capabilities.  Hand-launched horizontal takeoffs were OK. I knew what the problem was, but not the root cause. At cruise, everything was fine and you could hear that distinctive tone of well-synched motors along with no rudder requirements. (There are no rudders, yaw is controlled by differential thrust of the motors, as mixed from the Throttle stick). Changing from a low or medium speed to higher Throttle caused severe yawing, due to unwanted differential thrust from the motors.

How do you know if 2 engines are in synch? Use a tachometer, or perhaps just listen. You will learn to detect the beat frequency when two sources are out of synch; it gradually decreases as the sources approach synchronization, and disappears if the frequencies match. On the ground, you can use a tach. Or, as I also did, mount your plane on a turntable and see how it responds to Throttle inputs. I have a turntable from an old microwave oven; an old phonograph turntable would be great, as well.


The big problem here was that the 2 engines would not respond identically as they are run up. I went through a lot of effort to to understand what was going on. ESCs? identical. Props? as identical as can be claimed.   It should have been obvious. Some dumbass had two slightly different motors on the thing! Now, I wonder who that could be?They were both 2208-14 motors and looked pretty much identical. Finally ... finally ... I realized what was wrong. One was a Cheetah 2208-24 (laser engraved onto the rotor) while the other was a BHP 2208-14T (it said so on a little sticker on the rotor). The former responded quicker  and more smoothly to power change than the latter. D'oh!


As part of this effort, I set out to test motors. In hindsight, I would do this before installation on an airplane, as I always do for my servos.

Here is the simple approach:
1. Bolt the motors down onto a piece of wood or your workbench, with suitable props attached.
2. Power the two ESCs via a Y-connection from a common LiPo.
3. Use a Y-connector to join the Throttle leads from the ESC. In my airplane(s), I avoid Y-connectors like the plague and on a twin you want/need separate channels for your throttles.
4.At some point, pull the Positive (RED) wire out of one of the connectors and tape it back out of the way. This is very important, both for the test setup and in the airplane.
5. Connect your servo tester to this common Throttle. Mine has a digital read-out of pulse width and a potentiometer to control that output. Mine can provide outputs of the typical range - 1000 through 2000 microseconds - which represent -100% through +100% on most systems.

Now, you have a means to control, hold and record RPM at any point in the power range while you check and record the two motors' RPM with your tach. As well, you can listen for synchronization (no beat frequency) or imperfect synch.  As others have discovered, even if you buy identical motors and ESCs, there may be some minor variations between the two systems. You could also measure current at various settings if you have an ammeter setup handy.

In my case, the Cheetah motor was very smooth in acceleration and held its RPMs close to constant at any setting. Not so for the (cheaper) BHP motor - it accelerated unevenly and wandered quite a bit. These motors are AC but  NOT synchronous motors.
 
The End
(at last)
   

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