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Nov 30, 2019, 05:37 PM
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Build Log

"Min-Fire": Scratchbuilt sportflyer


Hi, this os an on-going project:
Design-Inspiration from the old modell "Mustfire":
https://www.google.se/search?dcr=0&b...24.tKz5GjJT4cw
The aim is to produce an ligt stable plane for relaxing slow aerobatics.
I first planned to build this from balsa and make it wery lightwight.
But then i found nice 5 and 10 mm foamboards in an lokal shop so i changed my mind:
It will be flown without landing gear and bellyland in high grass on my lokal field.
I will add an pice of plywood to make it possible to mount landing gear later.

Span: 1660 mm, target weight 1600 gr, 4s/4A Lipo battery.
Drivetrain is from scrapped Muliplex Rockstar:
Covering will be done with vinyl from lokal hardware store.
Rudders is light 10 mm balsa.

Here is some picīs:
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Dec 01, 2019, 03:13 PM
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Looking good so far, i love your well organised and clean work bench. I hate to see cluttered dirty un-organised work benches.
Dec 01, 2019, 10:42 PM
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/s Too.much.organization. /s My shop is not "messy" but contains a much wider variety of stuff than the shop pictured. Being in the USA I also have to deal with two+ measuring standards for tools and components.

I'll bet Mats W is an engineer... Everything in it's place.
Dec 02, 2019, 09:47 AM
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The picture only shows a fraction of my hobbyroom but yes, i like to keep things in order.
And yes, i'm an engineer :-)
I was not happy about the match between fuselage and wing.
Built upp suface with thin ply and some scrap balsa.
Then i put epoxy and microbaloons in the gaps.
Also put microbaloons around lower edge of hud to make covering esier.
Turned out nice after sanding.

Covering now in progress:



// Mats W
Dec 02, 2019, 10:00 AM
Damage is expected
That's looking great! I like the balsa trailing edge on the wing.
Dec 02, 2019, 10:08 AM
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Leeading edge is also balsa...10 X 10 mm.
Gives good strength.
Wing is built up from two cheets of 5 mm foam.
One flat peace in the bottom.
Just put former and wingspar ontop, after that cover with 5 mm sheet.
Servos are installed before covering of course.
Then sanded and aded leeding and trailing edge.
Very easy to build and very good result.
All rudders is massive soft 10 mm balsa.

// Mats W
Dec 03, 2019, 03:12 PM
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Here is pics of covering compleeted.
Rudders mounted.
Now time for some electronics.
I will add some graphics later as well..

// Mats W
Dec 03, 2019, 09:34 PM
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Looking very nice. Love the wing underside!
Dec 21, 2019, 01:46 PM
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Some moore graphics made:
Drawn in Affinity Designer/ https://affinity.serif.com/en-gb/ and cut with Cameo vinyl cutter:
https://www.silhouetteamerica.com/

Next step is to check CG and then mount servos and linkage for rudder and elevator.

Merry christmas to you all.


// Mats W
Dec 21, 2019, 06:27 PM
Damage is expected
Quote:
Originally Posted by Mats W
Some moore graphics made:
Drawn in Affinity Designer/ https://affinity.serif.com/en-gb/ and cut with Cameo vinyl cutter:
https://www.silhouetteamerica.com/

Next step is to check CG and then mount servos and linkage for rudder and elevator.

Merry christmas to you all.


// Mats W
Mats,

What a beautiful plane you made! Enjoy your creation and Merry Christmas!

Dave W.
Dec 22, 2019, 08:29 AM
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Thank you Dave :-)

// Mats W
Apr 20, 2020, 02:30 PM
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Finally i got around to check CG and then mount servos and linkage for rudder and elevator.
The plane came out a bit nose heavy so i mounted the servos under a hatch in the aft part of the body.
Allso put a landing gear on for the first maiden.
Now ready to fly:

// Mats W
Apr 20, 2020, 07:47 PM
Damage is expected
That looks really good! Have you done a wing loading calculation? I'm curious as paint seems to add a lot of weight on my planes and the wings look a teensy bit on the skinny side.
May 18, 2020, 01:58 PM
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Hi friends, this plane is now maidened with great success.
I flow 4 packs a 8 min.
Werry slow, steady plane able to make some looping and wingovers.
Roll from straight flight was not a good idea because of the long wing but that was anticipated.
A nice "floater" for calm summer evenings.
Allso prowed that my building technicis ok.
Nice to know since i started this project: :-)
https://www.rcgroups.com/forums/show...e#post43952513

Warnekid: I checked the wing loading and it is 57 gr/ dm2.
Iīm not sure how you translate that to your way of expressing this?

Take care out there:

// Mats W


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