Marvin Martian's Flying Saucer - Page 3 - RC Groups
Shop our Airplanes Products Drone Products Sales
Thread Tools
Jan 11, 2013, 09:47 PM
I ask a lot of questions.
Quote:
Originally Posted by bobdaeronort
I went through almost a eleven bundles (1200 sqft) last year or about 3 1/4 sqft per day which is almost half a sheet since I use at least two sheets per plane that would be a plane or project every four days which is about right. About what it would take to skin a 1200 sqft house.
It's getting much harder to find around here unless pink is your color.
That sounds like you have CDO like me...it's like OCD (But the letters are in the right order as they are suppose to be)
Sign up now
to remove ads between posts
Jan 11, 2013, 11:10 PM
"Five Easy Pieces"
Quote:
Originally Posted by Disco Stew
That sounds like you have CDO like me...it's like OCD (But the letters are in the right order as they are suppose to be)
LOL.
I dunno bout that.
I know I don't have a full-time job or at the moment any job so this keeps me sane. Believe it or not.
Jan 12, 2013, 09:23 AM
Registered User
Dickeroo's Avatar

Have there been any reports of a flying saucer in your area?


Bob...

That video was terrific!

~ Dick
Jan 12, 2013, 12:27 PM
"Five Easy Pieces"
Quote:
Originally Posted by Dickeroo
Bob...

That video was terrific!

~ Dick
Thanks.
She flies great on you wing design. The forward 40% of the disk is your airfoil. looks like a scimitar moon. The wind was 10 mph gusting over 20 and was really pushing that 40" disk around till I got her pointed into the wind and up to speed and then your wing effect took over and she flew fine.
No vid of the crash though. Minor damage to the left leading edge. All fixed now.
I reconfigured her control set-up so I have a separate and larger elevator and ailerons.
Gonna take her back up as time and weather permits.
Jan 12, 2013, 12:55 PM
Registered User
Flies well... But sans Marvin it's looking more as a Nutball rather than Marvin the Martians' Saucer :-)
Jan 12, 2013, 01:43 PM
"Five Easy Pieces"
Quote:
Originally Posted by Bare
Flies well... But sans Marvin it's looking more as a Nutball rather than Marvin the Martians' Saucer :-)
Thanks, but, Marvin's rather shy actually.
What is a "Nutball"?
No.
Wait I found it.
LOL well it is round but my motor is just behind the KFM4 airfoil and the AC.
The Li-po is upfront and my rudderage is ventral. But other than that.....
Jan 13, 2013, 03:01 PM
"Five Easy Pieces"
I was rechecking my CoG, after reconfiguring her control set-up and adding a servo to her tail to move her elevator, and decided I'd made my X-2 to neutral originally which could have been the main reason that I had so much trouble in a 10 mph wind on the maiden. So I made some adjustments so now she's decidedly nose heavy. I took the X-2 glider and added another bolt to it's nose and she flies better too. Oh well.
So I weighed her with my spring scale and she is at 34 oz. RTF.
Last edited by bobdaeronort; Jan 14, 2013 at 06:55 AM.
Jan 14, 2013, 11:35 AM
"Five Easy Pieces"
Took her back out this morning and found out right away that I had the CoG all wrong. Majorly tail heavy with the new tail mods. The elevator was way to big too. I'm going back to her original two servo elevon set-up to lighten the tail and then to refigure her CoG. I was closer on the first go than with the changes. The 18" diameter test glider proves that she flies much better nose heavy I just need to find that point.

X 2 Trials (1 min 32 sec)
Last edited by bobdaeronort; Jan 14, 2013 at 02:14 PM.
Jan 14, 2013, 09:02 PM
skumgummi dave
Ooch, owch, ouchie, Now cut that out Bob...
Jan 14, 2013, 09:56 PM
"Five Easy Pieces"
Quote:
Originally Posted by foamdave
Ooch, owch, ouchie, Now cut that out Bob...
I know, I know. No Actually I don't know. I don't know how to find this things CoG.
I'm just guessing. Oh well, trial and error.
Jan 15, 2013, 01:00 AM
DIY Mania from Taiwan
CG at 25% on the flying disc always doing better job
just a humble suggestion
regards
Sam
Jan 15, 2013, 07:29 AM
"Five Easy Pieces"
Quote:
Originally Posted by samwei1950
CG at 25% on the flying disc always doing better job
just a humble suggestion
regards
Sam
No, That a Great suggestion.
THANK YOU Sam!!
This is my first flying disk and I think I'm behind on the curve.
I will make that adjustment.
Jan 15, 2013, 10:22 AM
"Five Easy Pieces"
SO Sam from Taiwan here on RCGroups wrote me and suggested a 1/4 of the wing centerline back from the LE to the balance point or CoG which is what he uses on his flying disks?
Well, I tried this but it was pretty severe.
SO, I checked the CoG (which I had not done) on my 1/2 scale glider disk (which has done so well especially since I added 1/3 more nose weight) and she balances perfectly at 1/3 back but not at all at 1/4 back.
Hmmmmm.
Well at least I'm making progress as I originally had the SMJv3 set just forward of the 40" diameter disk's center or about 16" from LE to the motor's center mass.
So I removed the SMJv2 and rebalanced the X-II with the motor centered on this 1/3 point about
13 1/3" on this 40" disk back from the LE and the 2250 mah Li-Po upfront, still with some wiggle room, and .....success.
She balances there with her nose down 10 degrees just like the glider does.
So now to rebuild and reconfigure the disk again.
More Later.
Oh, and Thanks again Sam.
Jan 15, 2013, 10:39 AM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
Turns out there are really two CGs , one for best Glide , and one slightly forward for Flying ... Due to design/construction differences , each disk must be tested with different CGs to see what Flies best .... Most of the time the flying disk CG is ~ 25% , depending how you like to fly ...
We fly the plane first upright , then inverted to see the difference , then just adjust the Cg accordingly .. Once you find the correct CG , your disk should be as stable as a Piper Cub on Mars ...
Jan 15, 2013, 01:53 PM
"Five Easy Pieces"
Quote:
Originally Posted by gpw
Turns out there are really two CGs , one for best Glide , and one slightly forward for Flying ... Due to design/construction differences , each disk must be tested with different CGs to see what Flies best .... Most of the time the flying disk CG is ~ 25% , depending how you like to fly ...
We fly the plane first upright , then inverted to see the difference , then just adjust the Cg accordingly .. Once you find the correct CG , your disk should be as stable as a Piper Cub on Mars ...
Ahhh. I see.
So in this instance I have a margin - from 10" back from the LE (25%) to 13 1/3" (30%), or about 3 " one way or the other area where the CoG lies.
Thanks.
Did not know this.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Alert OT: Flying Saucers are REAL! Kmot Dock Talk 27 Dec 08, 2014 04:59 PM
Discussion A IR flying saucer mini quadcopter not much larger then an outstretched palm goodluckbuy Multirotor Drone Talk 5 Jul 06, 2012 12:04 PM
Discussion Newbie Q's on flying saucer coaxialnewbie Power Systems 13 Apr 27, 2012 03:44 AM
Found Flying Saucer wing881 Aircraft - Fuel - Airplanes (FS/W) 3 Apr 05, 2012 02:29 PM
Cool Hovercraft + Helicopter = Geoff's Flying Saucer tangel Micro Helis 4 Apr 11, 2007 08:22 PM