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Messages - Deerslayer

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1
Buy, Sell, Trade or Give Away / OMP 60" Sbach Electric For Sale
« on: April 24, 2018, 04:54:52 PM »
I am posting this on behalf of Dan. I have the plane in storage here.

Here is a video which shows what this plane in the hands of a good pilot is all about:
https://www.youtube.com/watch?v=kO_dxrwom1E&feature=youtu.be

Here is an RCGROUPS thread:
https://www.rcgroups.com/forums/showthread.php?1845114-OMP-60-Sbach-Assembly


Note from Dan:

Ohio Model Products (OMP)
60” Electric Sbach
Converted to e-Flite Power 60 (470KV)
80 Amp ESC
Spectrum Rx
Hitec Servos
Spectrum Servo for Rudder (needs installation)
Airplane is in good shape. It had 1 hard landing that knocked the gear off and put the wheel-pants through the bottom covering of the wing. No damage to the wings at all - just the covering.

If you are interested, contact me (Gary) and I can put you in touch with Dan.

2
Buy, Sell, Trade or Give Away / Aeroworks Pro X260
« on: April 24, 2018, 03:31:05 PM »
This is it:

https://www.greathobbies.com/productinfo/?prod_id=AWK01011A

This plane of Dan's has seen less than a  dozen flights.
Ready to go, it has:
OS 55AX engine, only run twice!
High quality metal gear servos - HiTec 645MG.
Spektrum receiver.
Wing covers.

While capable of 3D and generally wicked sport flying, this plane is rock steady and can also be handled well by a low time pilot. It has no trickiness, great in high winds and turbulence, high visibility and looks good in the air and on the ground. High quality workmanship, durable, as expected in an Aeroworks plane.


This is what it can do!
https://www.youtube.com/watch?v=HBocIiFpVdo

Let's talk!

3
As you know, Walter has a new one and we were talking about them. A  small number built in WW1 and they only entered service in the very last couple of months of the war, so battle experience was low.

They were blazingly fast for the time!

Brian Coughlin built a replica twenty some years ago. It was featured inthe EAA magazine. He was a really young guy, living right near Old Rhinebeck. I saw it fly just a few days after it s first test flight. What a machine, quick and agile.

4
Buy, Sell, Trade or Give Away / Carbon-Z Scimitar for Sale
« on: April 23, 2018, 07:02:11 PM »
Check this out. These have had a strong following and lots of complaints when Horizon stopped production. I am willing to part with it for a very flexible, negotiable price.

This has retracts, independent rudders/airbrakes, vectored thrust. The plane can be flown with all of this stuff operational, using 7 or 8 individual channels, or use fewer channels by Y-connecting the nosewheel steering and rudder servos, etc. It is not hard to fly, yet can be quite exciting to really wring it out. I flew it on 6-cell battery.

https://www.horizonhobby.com/products/carbon-z-scimitar-bnf-EFL10180

5
Very nice, D!
I hope she flies as well as she looks ... and she probably will.

Interesting camouflage paint scheme on those birds, isn't it. Looks a tad "girly", don't ya think? (Of course, once that big machine gun starts to rattle away at your Englander butt, it may not look so girly, I suppose!)
 

6
General Discussion / Re: Swap meet update
« on: April 18, 2018, 10:09:17 AM »
Sorry to hear that, Wilf.  Thanks for trying.


7
I have owned the DX9 for about a hundred years (as my late friend Flypaper would say!) and am still discovering what certain things do and can be used for. Here is one situation that presented and which a simple combination of Flight Modes and Digital Switch Setup functions provided the solution. This is applicable to any of the DX-series, later generations of transmitters, which run the common Airware operating system.

The problem was, the Vector flight controller/stabilizer in my plane has a large selection of Modes. You can select up to 5 Vector modes (not to be confused with Flight Modes, which pertains only to the transmitter setup.). These can be assigned to one or more switches, commanding a specific channel which is connected from the receiver to the Vector.
Setting up 3 conditions on a 3-position switch is easy, but I wanted to use 6 position across two of my switches. As well, I wanted settings of these two switches to be mutually exclusive.

First, you need to understand the Vector's Mode protocol. They look at the Mode channel and enable 1 of the 5 possible Modes depending upon what is the pulse length. Don't worry about how you figure out how to convert Pulse width to the % values the transmitter shows, I will explain it later on.
Here is the table showing which Mode the Vector is in, as determined by the Pulse width
1 < 1250 microseconds
2 1250 - 1400
3 1400 - 1600
4 1600 - 1750
5 > 1750

Now, a word about Flight Modes. I have a very simple set of Flight Modes for this aircraft - only 3, so it only requires one 3-position switch. they are 1,2 an 3, which I call Normal, Cruise and TO/GA (takeoff/go around). Certain control mixes may, or may not, be enabled when each Flight Mode is selected. When I establish the Mixes for my two 3-position Vector Mode switches, I select which Flight Mode(s) will enable that switch and, therefore, the 3 Vector Mode settings allowable within that Flight Mode.

I use the GEAR channel for my Vector Mode. As with all my aircraft, a Channel Assign moved control of that channel away from the default A switch, as that is my Throttle Cut; I assigned the Gear channel to the F switch.

Now, I have already created the 3 Flight Modes, so it is time to set up the Mixes. 
1 = Normal   No Controls mixing
2 = Cruise    No Controls mixing
3 = TO/GA   Lots of Controls Mixing (for Crow, etc.)

Next, comes the Digital Switch Setup. Digital 2-position and 3-position Switches by default have  +100, 0, -100% as their command outputs, Digital Switch Setup allows you to change each of these individual positions to anything from 0 to 150%. I want my switches to operate in the Normal and Cruise Flight Modes, as follows:

Switch E -
Pos 0  = Vector Mode 1 = Loiter
Pos 2  = Vector Mode 2 = 3D Heading Hold
Pos 3  = Vector Mode 3 = OFF
Switch F -
Pos 5  = Vector Mode 5 = RTH TEST
Pos 4  = Vector Mode 4 = 2D Heading Hold
Pos 3  = Vector Mode 3= OFF

So, within the Digital Switch Setup, I have set Switch E to have 0, -45 , -100 as its three positions and Switch F as 0, 45,100 as its states. (I have already translated the requires Pulse widths to determine the +-45% settings.

Then, we set up two simple Mixes:

Switch E is mixed to GEAR  with its default 100,100 values,  active in Flight Modes 1 (Normal) and 2 (Cruise), disabled in 3 (TO/GA).

Switch F is also mixed to GEAR exactly as with Switch E.

Now, in either the Normal or Cruise Flight Modes with both Vector Mode (E & F) Switches in the Down position, the Gear channel is outputting  the "0" or Centered command, so the Vector is in its OFF Mode. In TO/GA Flight Mode, these two Switched are inoperative and the Vector is in OFF. This means that, at any time, pulling both E and F back will turn the Vector OFF, regardless of Flight Mode.

This is simpler than it may sound. This particular need and the specific settings of Switches is just one example of what can be done with two very powerful functions on Spektrum and other systems, once you get the basic idea. I have done a lot of Mixing, etc. across many aircraft of different types and with varying setups, yet I am still learning new stuff all the time.

If this gives anyone some ideas or questions, please let me know. I may be able to help you, or at least point you in the direction of someone who knows a lot more about it and is very patient and willing to assist.

----------------------------------------------------------

Addendum - Translating % to Pulse Width

Spektrum defaults to Pulse Width range of 900 to 1900 as -100% and +100%, respectively.  You can set Servo Travel to as high and low as -150% and 150%, respectively. Pulse Width = 1500 is 0%, or Center, regardless of the range setting. For my Vector control example, I Ieft them at the defaults.

My test setup consists of a receiver, digital servo tester and servo attached to a degree wheel. The latter is just for interest, only the receiver and digital readout on the servo tester is required. For this test, and in the eventual aircraft setup, make sure that there is no unwanted Mix or Trim settings lurking in the background to interfere with your required operation. (Experience speaking here!)

Pulse Width = 1500 is 0%, or Center, regardless of the range setting.

I set up my test channel such that it was on the Throttle, as that enables more precise adjustments which stay in place while taking various readings. In the Trims menu, I had set Throttle Trim to "0", to ensure that I got clean readings, with only the stick movement. From there on, it is simple:

1. Go to the Monitor screen on the transmitter.

2. Set the throttle stick in various positions, taking readings of both the % on the transmitter and the Pulse Width microseconds on the servo tester. If you are really interested, as I was, plot them and convince yourself that they are linear, and/or  have your servo degree wheel hooked up and watch it wiggle around. Do not worry if the digital readout is slightly different from expected; mine read 17 microseconds high at the Center and the endpoints, I do not know why, but it is a trivial error.

3. My Vector modes required it seeing the following Pulse Widths:
1 < 1250 microseconds
2 1250 - 1400
3 1400 - 1600
4 1600 - 1750
5 > 1750
So, via Digital Switch Setup, I set Switches E and F to have "0" at their same position, pulled fully back. That gives Mode 3 on both.
Then, I set Switches E an F to be at -100 and +100, respectively, in their furthest forward positions. Modes 1 and 5 are now taken care of.
Mode 2 and 4 are the ones where you need to know the correspondence between % and Pulse Width, as these activate within narrow ranges of values. I found that +-45% values were fairly centered within these required values, so those will be the Switch midle positions.

Therefore, my Digital Switches are set up as E = 0, -50, -100 and F = 0, 50, 100.

The servo tester with a digital readout is my most valuable gadget in the shop or at the field. This is one example where it was essential. I use it to check out every new servo immediately after purchase and every servo prior to, and immediately after, installation in an aircraft, or when a malfunction occurs or is suspected. Get one for yourself!

8
FPV at KRCM / Some FPV Ramblings
« on: April 14, 2018, 11:36:18 AM »
Attached is a summary of some FPV-related stuff I have been doing. I hope it give someone some ideas, or can start a discussion.

9
It surprises me that Flypaper never showed up with one of these ... or did he?

https://youtu.be/p1d1eQ2GhPA

10
VIDEOS and PICTURES from KRCM Events and Activities / Levin's Hotts
« on: April 12, 2018, 08:38:46 AM »
Harold and Levin have been at it again! They dug out what is claimed to be a Hotts sport airplane from way back in time, cleaned it up and fitted a new ASP .46 engine.

Back some 30 years ago, the Hotts was  at the top of the heap of fun flyers. Dan Santich designed the original one, followed by the Hotts II (two) and Midwest kitted it as one of their superb Success Series offerings. I had one of those and it was the most enjoyable kit I ever built, before or afterward. It was a terrific flyer and I would love to find on of those original kits to build again.

There were many variations of the Hotts that were created over the years, several of which even showed up in our Club. Giant scale, intermediate, biplane, SPAD, foamy, too many to recall.

This particular plane most be scratch built, as i has foam sheeted wings, no plywood sides or turtle deck and its fuselage shape differs from the angular slab facets of the original Hotts. The wing tips do not have the end plates which were very critical to taming the behaviour of the original Hotts II. But, who cares, let's call it a Hotts and see how it flies!

I was pleased to take it for the test flight. Wow! this thing really rocks and brings back some memories! After a quick try, I cranked in about 50% expo on the Ailerons and Elevator, eventually bumping it up to 60% on both after we did the second flight. We called it quits, as the wind was howling. I left Levin with a couple of suggestions, such as relocating the battery to move the C of G further back.

As this was the first flight for this plane and engine, in our hands, and it was a very windy and gusty day, I did the takeoff and the eventual landing. Levin took over in the air, once we got a bit familiar with it. He will have to be very careful, as it is a step change from the average airplane that scoots around these days but he is very capable of handing it. 

11
Some of you may know Levin, a.k.a. Flight Kid.

Apart from hanging out with us and flying, he leads a very challenging academic life. Recently, he participated in the regional Science Fair at Duncan Macarthur Hall.

Harold and I were privileged to obtain a sit-down VIP visit with Levin at his display. We were unable to stump him with our questions; he really does know what he is talking about!

Levin's project was the laser CNC system which he designed, built, programmed and documented. His dad helped with the cutting of the wooden components and perhaps in the de-bugging associated electronics, but L learned/utilized the GRBL programming language and all of the other associated technological aspects. The device works, although he was not allowed to activate the laser at the Fair, due to safety requirements, quite understandable, even though he currently has only a 5mw or such laser from a CD drive. He plans to purchase a higher powered laser and be able to cut foam for ... guess what ... flying machines!

I suggested that he bring his travelling road show out the to field sometime this summer (perhaps at the FDFF) and display it.

Harold and I were really impressed with the tremendous efforts and variety of projects at the Science Fair. We walked away feeling really positive about those who will be the future Engineers and Scientists and leaders. Great work and Good Luck to all of them!

Perhaps our guy will choose to comment in here, with more explanation, if he ever gets some time!

Meanwhile, here are a few pictures taken at the event.

12
Well, guess what I found out at the Toyground! (Pictures attached.)
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Grasscutter was rootin' around with a digger that he "borrowed" from ... don't ask! So, what is he up to? Well, he started out strip-mining an area just east of the building (there is only one building now). He seems to have hit bedrock before encountering any gold or human remains.

You never saw a guy so happy as this fellow playing around in the dirt. By the way, who would have guessed that there is actually some high quality soil between the grass roots and the rock around here? Look at the giant pile!

His next step was to call in a load of crushed stone and start filling the hole up again.

So, what is he really up to?

This is the first step of expanding the dining/observing area. A concrete pad will be poured and, if the money doesn't run out, the clubhouse overhang will be extended over it.

This will provide a very nice shelter for the Peanut Gallery, as well as a place to set up or work on planes, as well as to prepare food and eat it.

KRCM owes Marvin a hearty thanks for scrounging up the excavation equipment and knowing how to use it.

As I was leaving, Mike was on his way out with a surveyor's level so that Marvin could begin the levelling and tamping of the stone. (It looked to me that a couple more loads would be needed to establish the base for the 5 inches of concrete to cap it off, so he may be at this for awhile yet.)

Marvin - how about an update?

13
When do Training Nights start this year?

14
General Discussion / Classic Canadian Test Pilot Documentary
« on: April 05, 2018, 07:15:26 AM »
This is a superb film, produced by the National Film Board with Fred Davis as the reporter. Some may recall Fred from his days as host of Front Page Challenge. DeHaviland's chief test pilot is featured. It is hard to realize that some of the air work overlooks the farmland area way out at Downsview (it was sort of Canada's Area 51)! In the segment on the water, you can pick out the old Five Roses (I think it was) grain elevator and the Toronto Island ferry scooting across the harbour. Some of us can, at least dimly, remember seeing some of these state of the art aircraft at places like the old Trenton Air Show. Fine viewing, hope you enjoy it!

https://www.nfb.ca/film/test-pilot/

15
I use hot glue, it works well, especially on the balance charge leads.
As for connectors, I bought those little plastic servo lead locks from HK, they cost a few pennies and are great!

New subject: have you been able to find PolyCrylic in small cans? They want $23 for a quart here. Do you wipe both sides of a sheet at the same time? (remember my warping problem)
Reg


I used to use hot glue years ago but found that I was fooling myself. It did not really adhere well to the connectors (at least with the standard connectors and in a glow fuel environment where it is possible to get contamination from pulling the connectors apart and reinstalling them. Any of the 3 components in glow fuel will release the weak mechanical bond of glue to the connector and/or wiring. Also, the hot glue is rather inflexible to use as a strain relief, whereas RTV has flexibility. That is why it is often used in industrial settings. Before applying, I may wipe the connector and wiring with a paper towel that had been dampened with acetone, as that gets rid of any oils that may be present from manufacturing or previous handling. I sometimes do like to stick parallel servo wires together with the occasional tiny dab of hot glue, striving for neatness, or just to tack wiring to foam. 

Hot glue is wonderful, but not for everything, IMHO! (Flypaper might have given me a good swat for such a statement, eh!)

 I have a little collection of those servo locks but never seem to get around to using them. For something hidden, such as a servo extension connection inside of a wing, I tie some thread or dental floss across the connectors, between two of the wires of each part, sort of like wrapping a present. That way, the assembly will still thread easily through ribs, etc., without pulling apart.

For tiny assemblies, such as those little connectors and micro wire on a camera. you want something that really helps hold the connector and pins and wire together if there is stress applied. Hot glue doesn't do much for that. I like RTV, instead of messing around with shrink wrap on many connector/wire arrangements, even on the big LiPo and ESC stuff. It is an insulator, flexible strain relief and can prevent the pins themselves from disengaging on some types of connectors.

And, as you may have already suspected, Yes, I do own a major interest in the RTV company!

As for the polycrylic, I still have a smidgen left from the one and only 1 litre can I bought many years ago. It goes a looooong way when you dilute it at least 1:1 with water for my kind of work. Back then, it was not available at the Home Despot in any other sizes and other places I had checked did not carry it at all.  Not a huge investment, compared to most of the stuff we pour into this hobby, plus you can paint a table or something with it and impress your (much) better half - not that I would know from experience.

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