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Old Jun 24, 2012, 03:56 PM
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Mounted two Cross Motor mounts on the wood to check security
after the CA treatment. They seem to be secure feeling.
When glued to the rotating tube they should be very firm.

Next Cut loose the canard Elevators and gave some thought to their linkage.
I WAS going to DO a simple old style elevator "U" between them.
It was easy to draw in CAD ...
But I've made the fore wing mounting at the same level as the interior tray.
That puts the "U" on the same plane AKA interference !
So I am deciding on whether to Cut away a slot in the tray
Or just put a servo in the side of the fuse on each side and Y them.

I keep WANTING to close up the fuse at the back but so that I can check the
Fuse Twist "ability" . But my common sense says Wait , til later
you might want the access the interior so whatever reason.

Spoz I could cut the Cargo door into it and just get on with it.

Nuf for Sunday,

Bob
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Old Jun 29, 2012, 11:37 AM
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Not much progress while waiting for the motor and esc's but I have been busy\FLYing
and shopping.

After a pilgrimage to TWO Waly's I discovered that they NO LONGER stock H20
even thought they say so @ Wally.WEB :-(

I guess I'll just have to MAIL order some.

I also took the speeds folks HK a full week to get my oder "in to" the mail. aaaaargh

L8

Bob
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Old Jun 29, 2012, 02:04 PM
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Would it be easy (or feasible) to somehow get the props closer to the pivot point to reduce the forces transferred to the tilting servos? Maybe mount the motor into a "bucket" of sorts to sink it down some?
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Old Jun 29, 2012, 06:11 PM
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i'M SURE IT'S POSSIBLE.

I was simply attempting to replicate what F&T had done.

The rear motors are quite close to the pivoting rod.
The fronts are a bit extended as the outer wings are pivoted at their middle.

I had not foreseen any serious issues, but ...

What problems are you attempting to avert ?
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Old Jun 29, 2012, 06:29 PM
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I'm not sure how to estimate the extra forces that might tax the servos. I thought it might be possible to overload a micro servo and pondered how one might go about quantifying this problem or working around it. I wasn't necessarily referring directly to you.
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Old Jun 29, 2012, 06:52 PM
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Quote:
Originally Posted by Iron Savior View Post
...how one might go about quantifying this problem or working around it...
Seems like it's all about leverage to me. The further away from the pivot point, the longer the lever arm, the more stress you have.

I used strips of brass for motor mounts to get the bell and prop as close to the pivot point as I could but these little servos available to us these days seem to handle more stress as F&T shows. I tried it once with the motors farther away like F&T and it worked just fine. There is a little more vibration and the slop in your servo will be more pronounced so it becames more of a problem after a few not so gentle landings where things tend to loosen up a little.
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Old Jun 29, 2012, 06:56 PM
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Quote:
Originally Posted by RCvertt View Post
Seems like it's all about leverage to me.
That's the general idea. I just don't know how to measure and/or predict what those forces might actually be in concrete figures that can be compared to the published rated strength of a candidate servo.
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Old Jun 29, 2012, 07:30 PM
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I've selected a Multi Kg servo for the motor pivot job.

I guess thats how I was planning on overcoming the stress.
Figruning on setting the endpopints with TX limiting.

There are several NEW controller boards out there lately.

RCTimer has one that has super sensors for ~$60

But HK has one with a builtin LCD and mixing capabilitys right on screen.It's ~$30
This Might be good enough to do what I want.
But NONE seem to ever have indepth descriptions of capabilities.

Just ... Here's a board go figure it out on your own ! ???

One is left to GEEK OUT or go begging !

sigh ...

Bob
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Old Jun 30, 2012, 05:39 PM
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Wooo WHoo !

HK came thru today with my order of Motors and ESC's

Just in time for me to Leave for a trip to see the Grand Kids in Indianapolis.
Be back around the middle of July.

SO now that I'm ready I cant do much for a couple of weeks :-(

Maybe by early Aug I'll have something "test" able !

Bob
Northwest Cutout Service
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Old Jun 30, 2012, 07:24 PM
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Quote:
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...Just in time for me to Leave for a trip to see the Grand Kids in Indianapolis.
Be back around the middle of July.

SO now that I'm ready I cant do much for a couple of weeks :-(...
Take it all with you and tell the grand kids you have a cool new plane for them to build. Free child labor

As for the board choices, might as well start with what F&T used since all the code is available in this thread and make it simpler after that if you want.

Have a good 4th on your trip.
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Old Jul 19, 2012, 09:07 PM
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Hey anyone, I need help I've been following this discussion from the start. I've built QTR based on F&Ts. I first started with a KK board. I then decided my motors are too small. I have ordered larger ones. I reread and understand that the MultiWii is where I need to go. I built the board. I am trying to load the last code on #83 of this thread (MultiWiiV1.7. I am getting "error compiling" messages. I am going to try to load a photo of my QTR but I am new to entering anything here.Name: IMG_0353.JPG
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Old Jul 19, 2012, 09:43 PM
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I have NOT gotten that far yet.

I Have been busy building however.

I have the Wings on the Spars in the Rotating motor mounts in.

Pix as I get time , but, I just got NEW foam in and have orders to fill.

Hope somebody figures out all the Electronics stuff.

Bob
Northwest Cutout Service.
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Old Jul 19, 2012, 10:30 PM
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QTR looks good. Welcome to the wonderful, expensive and often times frustrating world of VTOL. Us at F&T Aeronautics Incorporated aim to change all of that soon

Quote:
Originally Posted by tom-tom 1 View Post
... I am getting "error compiling" messages. I am going to try to load a photo of my QTR but I am new to entering anything here.
Try Arduino(0022).
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Old Jul 19, 2012, 10:51 PM
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Bob,
Glad your back. I downloaded your plan file and took it to Office Depot. They could'nt print it to size. Are you going to add the two parts and re-post it? Can you re-post it as jpeg?

Also, I used Krylon (Fusion) for plastic from Wal-mart to paint my depron. It did sorta rough up a few areas but not too bad. I think if you did a few thin coats instead of one full coverage, you would be ok.

I mounted my motor mounts directly to the pivot rods. They seem to work fine. If that were my only problem! I will try to post a video of my first attempt with the KK board installed if I can figure out how to do it. I've never done that either.

I'm going to put together a QTR lite. Kind of like F&Ts first one. I'll use the motors from the too weak first one. I'll use your plans for this one. I just guessed the first time, it may not fly at all.

There was something else, o yea, when you mount your servos for your elevators. Mount them identical on each side so you can use a simple Y. If you mount them as a mirror of each other, you will have to use an $ reversing Y. I did it wrong and had to change one.
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Old Jul 19, 2012, 10:58 PM
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RCvertt
Thanks for your reply. I am using Arduino 1.0. I will try to find and use 0023 tomorrow. I've been working on this thing all day. It is frustrating, but you have given me hope for tomorrow. I think I'll go to bed on that note.
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