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My first attempt at a micro...

How long will it stay in the air?


  • Total voters
    17

lobstermash

Propaganda machine
Mentor
#1
I've not had a micro before, but I thought I'd give building one a go. I didn't use a plan, but wanted something about 40cm wingspan. I drew one out on 3mm depron and hot glued it together. Unfortunately I didn't have any micro gear, so I've used 9g servos, a standard size 20A ESC and the 8ch 9x Rx. To power it I've got a 2205 1400kv motor. It's only about 20g, but the only prop I've got that fits it is a cut down 8x3.8 (to about 7.3x3.8). The smallest battery I've got is a 1000mAh 3s... I've run the calculations through an online tool to calculate wing loading, which comes out to 105g/square dm (33.81oz/square ft). So a little on the heavy side...

I haven't had a test flight yet. Here's hoping the powerhouse is enough to create lift with those tiny wings!

IMG018.jpg IMG021.jpg IMG022.jpg
 

Ak Flyer

Fly the wings off
Mentor
#2
Looks like fun. I'm not seeing ailerons are you making it 3 channel? If so I would be concerned that there's no dihedral in the wing to make it stable.
 

lobstermash

Propaganda machine
Mentor
#3
Hmmm. Yeah, 3 channel was the plan... Maybe I need to add some dihedral... I'm just thinking about another micro 3 channel without dihedral I saw on the weekend... Thanks for the heads up
 

Ak Flyer

Fly the wings off
Mentor
#4
No problem. I haven't seen a successful airplane without either ailerons or a lot of dihedral. If it's got a heavy wing loading, you may end up flying high alpha a lot which may be easier with ailerons. Just a thought.
 

lobstermash

Propaganda machine
Mentor
#5
It's balanced out pretty well, so I don't think it'll be high alpha too much. Working out how to add dihedral with undercambered wings now...
 

lobstermash

Propaganda machine
Mentor
#7
I've added dihedral by cutting a little out of the base of the wing. Glydr decorated it for me tonight, which indicates what he thinks of it... I must admit, I don't have high hopes for it, but now I won't look the silliest if this thing defies gravity! I'll take a couple of photos in the morning.
 

glydr

How many letters do we ge
#8
. Glydr decorated it for me tonight, which indicates what he thinks of it
I'm still laughing!

:)

I hope that our foreign flite-brethren appreciate the Aussie 'banter' culture. That is should one person should stand out having performed something foolhardy (e.g. refer pictures in post #1) we mercilessly tease in good humour and expect the same back when tables turn against us. It's all friendly! Really!

In any case the aircraft now has a name: "The FAIL"

And ARF has a new meaning: Almost Ready to FAIL.

(I think I feel a T-Shirt coming on).

LM, the only hope you have for you is the design theory applied to this thing:

F104s.jpg

The Canadians called this (the F-104) the "Lawn Dart". Unless it rains before the maiden the stubby nose on "The FAIL" may just snap off rather than dart in!

(Once again, this is good aussie banter - no trolling or bad stuff here! Just ask lobstermash!).
 

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pgerts

Old age member
Mentor
#9
:applause: It looks slightly heavy... I should aim for 25-50 grams flying wieght for a plane that size.
Looks like you have built a canard by the wing profile.
Don´t forget to video the maiden and add a poll with choices of first flight time
O - less than 2 sec
O - 2-10 sec
O - > 10 sec
 

lobstermash

Propaganda machine
Mentor
#11
I think I might take pgerts' suggestion and start a poll! I've got a couple of days until the maiden. I could try and 'fix' it by putting on a new wing(s). Making it a bipe, with 2x50cm wings, would pull the loading down to 35g/sq.dm and stall speed to 27km/h, and wouldn't render the tailplane useless...
 

lobstermash

Propaganda machine
Mentor
#12
PS, I don't mind sacrificing the plane as it is to generate humour! Let me know if I should try and fix it, or shame myself with the poll and a youtube vid :) Either way...
 

pgerts

Old age member
Mentor
#17
PS, I don't mind sacrificing the plane as it is to generate humour! Let me know if I should try and fix it, or shame myself with the poll and a youtube vid :) Either way...
Humour is fine!
It will be even better with i biplane or triplane or "quadplane".
Try to borrow a 500 mAh 3cell go get down the weight a little more.
A small plane like that is hard to fly but with less wingloading and speed it might get better.
Dont forget to add a pilot.
 

lobstermash

Propaganda machine
Mentor
#20
I haven't added any more wings or decorations... But here's a close up of each flightless bird:

IMG027.jpg IMG030.jpg

You'll have to check with the artist as to what they are... ;)