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FeiJi's blog
Archive for May, 2012
Posted by FeiJi | May 29, 2012 @ 12:45 AM | 3,593 Views
Using my wing to drop bombs. This might be a way to pay for my hobby, dropping advertisements downtown. Difficult to see bombs drop if not using full screen.
I'm not very good at bombing: power off, level flight, open bomb door, wait for the payload to drop, close bomb door, power on or land. I'm all over the place.

RC Flying Wing Bombing Runs (1 min 50 sec)

Posted by FeiJi | May 25, 2012 @ 09:37 PM | 3,362 Views
Here is my latest wing using basically the BluCore WIng build with the following mods:
- use 9mm EPP - single sheet of 1000mm * 600mm
- longer root chord
- use a one piece bottom wing with two top halves
- laminate wing for great strength
- bicycle spoke control rods
- aluminum bracket motor mount
-1800kv motor with 7x6 prop
- go finless

AUW is 430g - including 50 grams dead weight.
Servo wires are routed through hollow spaces inside wing. Also lots of room for internal leds. Mounted rx face down to protect wires.
Am trimming it out now. It is light and very strong compared to my foam board builds. Don't think I will go back to foam board anytime soon.
Maiden flight was not pretty - laterally out of balance by the battery and weights I used so sunk battery deeper into wing and turned sideways. Also, motor thrust line was too low so bent motor mount out a bit so thrust line is more in accord with chord line.

Update 5/28: This wing flies great - even with some wing warp in it which I can iron out with the laminate.
I had to remount battery sideways and put 2 ounces of weight on the battery. A 1300mah should be just about right.
This wing is not indestructible but it is much much stronger than anything I have built with foam board. On the foam board wings the nose gets soft and wrinkly after a few hard nose ins. The EPP stays pretty stiff and if it does get damaged it tears rather than fractures and is easy to make strong again with hotglue - all interesting points attested...Continue Reading
Posted by FeiJi | May 20, 2012 @ 07:59 PM | 3,577 Views
I am so tired of my fins falling off or breaking on my wings that I decided to try them without fins. I read in this forum that they will fly finless. This is a 1B1M delta wing that I tried it on and it seems to fly and glide just fine without fins.


1B1M Finless Foam Delta RC Plane (1 min 5 sec)

Posted by FeiJi | May 17, 2012 @ 04:39 PM | 3,450 Views
This is not news to most users of the keychain camera but I have been using it for a few months and have only now discovered the following:

- it is infinitely better to remove the memory card from the camera and use a card reader to read, copy and delete files. Trying to do that with my camera attached to the pc results in locking up the camera so that I can't do anything.

- when deleting files on the card they may get copied to a trash file on the card which still uses space on the card so that eventually it becomes full. At that point no more video space is available to take videos even though you think the card is empty. Just delete the trash file and all is ok. Can't believe I'm just finding this out. My camera is one of the early ones, #3 I think. Don't know if these points of interest apply to later cameras.
Posted by FeiJi | May 14, 2012 @ 07:03 AM | 3,086 Views
I decided to revive a dollar foam 1B1M delta I had built earlier since I got in a few new motors. Using 1500kv with 7x6 prop.
Made aluminum motor mount from some angle stock. The motor is mounted so close to the joint that there is little leverage to bend the mount in a crash; its pretty strong.
The delta is a little overbuilt with bamboo supports on the LE and behind the prop cut out. AUW is 360 grams. This is supposed to be a light wing ( around 110 g or so). I am really good at taking a light design and making a draggy behemoth out of it. Someday I will learn.
I differed from the original specs by putting everything up top. I don't like knocking off the stabilizer on landing.
Using bicycle spokes for control rods. They are a little heavy (about 4 grams each) but they don't flex.

Update 5/21: Took fin off and it flies great.
Posted by FeiJi | May 02, 2012 @ 01:03 AM | 3,168 Views
Sort of 3d effect from animated gif of my Boneyard 1 wing. Used two photos made only inches apart while aiming both photos at the same point of the wing. Used PhotoScape software to animate gif at 12 hundreds of a second. Kind of interesting. Found basic instructions at: http://lifehacker.com/5463436/make-i...-goofy-glasses