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Old Mar 15, 2012, 11:26 AM
Outta Sight
Australia, WA, Joondalup
Joined Jul 2008
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Angelos, what prop size are you running on that?
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Old Mar 15, 2012, 12:09 PM
Houba ! Houba !!
rcmonster99's Avatar
United Kingdom, England, Milton Keynes
Joined Sep 2003
6,193 Posts
Quote:
Originally Posted by Angelos View Post
Here is the maiden of the X8. It's not me swearing at the end (thanks Yogz for sound effects) and the plane landed safely 50 or so meters further down.

The motor is an A3732 KV480 running from 6S with 80A ESC. (The data on the video are a bit wrong.)

http://www.youtube.com/watch?v=Bx7KWibSWoo

The rudder worked but not as effective as I was hopping. As I like my planes agile I would be happier if it had twice as much authority and I may try increasing the size of the elevons. Still it may be enough to achieve it's ultimate purpose and I will re-evaluate it whist FPV.

I can't conclude how defective the crow airbrake was but I noticed the aileron and elevator controls lost some authority when the airbrake was on, possibly around 30%.

-Angelos
Nicely done Angelos.... can't wait to hear your opinions on your first fpv flight but it looks like you got this plane pretty well sorted already...
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Old Mar 15, 2012, 01:11 PM
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Old Blighty
Joined Apr 2010
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I've always thought this was an interesting motor for a 6S set-up. Pretty lightweight for its power and Kv rating

http://www.hobbyking.com/hobbyking/s...dProduct=14740
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Old Mar 15, 2012, 02:20 PM
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United States, GA, Buford
Joined Nov 2007
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Would a three blade folding prop benefit much?
http://www.hobbyking.com/hobbyking/s...dproduct=21878

smaller diameter prop; more 'grip' maybe
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Old Mar 15, 2012, 02:23 PM
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Lakewood, Colorado
Joined Aug 2002
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Folding props are already hard enough to balance, without trying to deal with a 3 blader.

ian
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Old Mar 15, 2012, 02:45 PM
um, yea, I can make that crash
Wayno Complaino's Avatar
United Kingdom, England, Milton Keynes
Joined Aug 2011
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Where would the the bladder 'go' on landing? Wouldn't it always drag (and get damaged) ?
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Old Mar 15, 2012, 02:54 PM
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Lakewood, Colorado
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Huh? That's the point of a folding prop.

ian
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Old Mar 15, 2012, 04:48 PM
um, yea, I can make that crash
Wayno Complaino's Avatar
United Kingdom, England, Milton Keynes
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Sorry, missed the folding bit, doh! Never seen a three blade folding prop...
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Old Mar 15, 2012, 05:04 PM
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Didcot, UK, OX11
Joined Sep 2003
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Quote:
Originally Posted by RolandS888 View Post
Angelos, what prop size are you running on that?

14*10 aeronaut camcarbon folder. It is VERY quiet, more so than it appears on the video (and it's not that loud on there!)

HOWEVER that was a los maiden, no FPV gear on board, so we cannot as yet verify that it is loading the motor correctly. Angelos is at this moment installing the rest of the kit so he will report back asap (maybe tomorrow)

Paul (Yogz) @ Spartan hq on Angelos' PC
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Last edited by Angelos; Mar 15, 2012 at 05:35 PM.
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Old Mar 15, 2012, 06:24 PM
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Austria, Wien, Vienna
Joined Feb 2012
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Quote:
Originally Posted by Wayno Complaino View Post
Sorry, missed the folding bit, doh! Never seen a three blade folding prop...
http://www.hobbyking.com/hobbyking/s...dProduct=21878
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Old Mar 15, 2012, 06:49 PM
Smoke on , go !
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Verona - Italy
Joined Jan 2007
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Or these if you want top quality http://www.aero-naut.de/en/products/...cessories.html
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Old Mar 15, 2012, 07:56 PM
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United States, GA, Buford
Joined Nov 2007
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Quote:
Originally Posted by zaguruinzasky View Post
Even though they cost a lot more, I'll take those over HK any day. I can't wait to start an X8.
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Old Mar 15, 2012, 09:09 PM
hmph!
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United States, UT, Logan
Joined Dec 2008
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Quote:
Originally Posted by geives1 View Post
what about using something like this for take off? Looks easy enough to build and seems to work great for powered sailplanes.

http://www.youtube.com/watch?v=Kx5AToRmcV8
I've been messing with a cart for launching a plane with a pusher prop. The problem is that the plane accelerates once it has lift and the cart slows down. This can result in some undesirable cart to prop interaction.
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Old Mar 16, 2012, 12:02 AM
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United States, CA, Chico
Joined Aug 2010
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So, I made a separate thread in the flying wing section, but I decided I should ask these here:

Most layouts I see have the (3s or 4s) batteries mounted in front, with long cables to the esc/motor. This seems to be a problem because:
A. I'm guessing making a foot and a half cable run to carry 60+ amps DC from the battery to the motor is going to lose a lot of energy to the voltage drop. I don't know how much.
B. The cables (carrying large DC amperages) would have to run very close past ArduPilot magnetometer (compass), which is definitely going to cause problems.

I don't see a way around mounting the batteries in the front, because I have nothing else heavy to put in the front to balance the plane that won't be deadweight.
One possible solution is to use higher voltages. So, using a 6s or 8s system, for efficiency rather than speed and power. However, I don't understand the prop/motor/speed/thrust/voltage/power relationship very well, so I was wondering how this can be done, specifically?

My other question is regarding landing gear. I fly off a runway primarily, and there's no foam-friendly grass nearby (mostly fields of star thistle.) So, how doable are retracts?
It's also important to me that the plane is relatively resistant to flipping or tipping over in wind while rolling, so I think the possible layouts of retracts are important to that concern...
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Old Mar 16, 2012, 12:17 AM
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Lakewood, Colorado
Joined Aug 2002
28,918 Posts
You're overthinking it. The voltage drop for a 1 foot long 12V DC run at 65Amps over
10-12Gauge copper wire is 1.1-1.8%, or at most 0.2V. Straight DC wires shouldn't
be generating a magnetic field.

ian
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