Mar 15, 2012, 10:26 AM
Outta Sight
Angelos, what prop size are you running on that?
Sign up now
to remove ads between posts
Mar 15, 2012, 11:09 AM
Houba ! Houba !!
rcmonster99's Avatar
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...
Mar 15, 2012, 12:11 PM
Registered User
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
Mar 15, 2012, 01:20 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
Would a three blade folding prop benefit much?
http://www.hobbyking.com/hobbyking/s...dproduct=21878

smaller diameter prop; more 'grip' maybe
Mar 15, 2012, 01:23 PM
Registered User
Daemon's Avatar
Folding props are already hard enough to balance, without trying to deal with a 3 blader.

ian
Mar 15, 2012, 01:45 PM
Fixed wings can be Drones too!
Wayno Complaino's Avatar
Where would the the bladder 'go' on landing? Wouldn't it always drag (and get damaged) ?
Mar 15, 2012, 01:54 PM
Registered User
Daemon's Avatar
Huh? That's the point of a folding prop.

ian
Mar 15, 2012, 03:48 PM
Fixed wings can be Drones too!
Wayno Complaino's Avatar
Sorry, missed the folding bit, doh! Never seen a three blade folding prop...
Mar 15, 2012, 04:04 PM
Registered User
Angelos's Avatar
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
Last edited by Angelos; Mar 15, 2012 at 04:35 PM.
Mar 15, 2012, 05:24 PM
Registered User
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
Mar 15, 2012, 05:49 PM
Smoke on , go !
zaguruinzasky's Avatar
Or these if you want top quality http://www.aero-naut.de/en/products/...cessories.html
Mar 15, 2012, 06:56 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
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.
Mar 15, 2012, 08:09 PM
hmph!
ASB32's Avatar
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.
Mar 15, 2012, 11:02 PM
Registered User
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...
Mar 15, 2012, 11:17 PM
Registered User
Daemon's Avatar
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


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product X8---new 2.4GHz Radio System ASSAN Radios 5745 Mar 15, 2017 10:31 AM
For Sale Assan 2.4 ghz X8 6ch receiver Brand New Scooter33 Aircraft - General - Radio Equipment (FS/W) 2 Oct 12, 2011 09:34 AM
Discussion Any info regarding this x8 setup?Better than coax x8? sjak Multirotor Drone Talk 11 Aug 14, 2011 08:33 AM
Sold New Assan Module X8 2.4 for JR Tx norstaroption Aircraft - General - Radio Equipment (FS/W) 6 Nov 21, 2009 05:42 AM
Sold New - 4 (Four) ASSAN X8 R6 6Ch 2.4GHz Receivers - $105 EyeFlyPlanes Aircraft - General - Radio Equipment (FS/W) 0 Oct 20, 2008 02:39 AM