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2m f3a own design. Myvec

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Old 01-26-2018, 05:08 AM
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Default 2m f3a own design. Myvec

Hi im Dan, first post on here. Based in the uk.
Going to do a bit of a thread on my new project for this year. I drew it up autumn last year but a new baby arrived in october so been a bit too busy to get it started.
However, baby no.2 is behaving itself so i thought id have a go at getting this thing flying!


Having flown a Spark (with Dave Snow wings) the back end of last season, i really liked the way it performed so decided to loosely base this design on the Spark. I also like the Agenda/Element/Invitation/Essence models so a bit of those designs feature too. Mainly fuz depth! Dont know if its as deep but pretty close.
Everything is pretty conventional (is an all wood f3a model conventional), no all moving tail, no retracts!! And 1 wing.
I'll be using the TMCR contra unit made by Adam Debowski. More on that later.


Wood selection as always is going to be important, the fuz is big and will take a lot of sheeting!


Dont know how i got the name Myvec but thats what its called.....at the moment Name:  grin.gif
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Anyway, heres some photos....
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Old 01-26-2018, 07:50 AM
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ltc
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Is this the Contra you are referring to?
It looks like a Q80 with a Contra added on? Very different looking.

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Old 01-26-2018, 07:58 AM
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Yes thats the one. They're a great bit of engineering but very simple when you break it down.
I'll put up more photos of the install when i get to that stage.

Dan
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Old 01-27-2018, 07:24 AM
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Bit more done last night. Its very fiddily and delicate at this stage but pretty close to sheeting now.
I pinned the bottom decking on just to see what it looks like, its pretty big. Ill remove this and pin it to the board to sheet it.
Its hard to see in the pics but on the rear half of the fuz on the bottom is a removable keel. Will be interesting to see how it effects the flying- if at all.
Dan
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Old 01-27-2018, 11:22 AM
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Very nice CAD work. I like the carbon rods in there too. Can we have a screen shot of the finished article?
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Old 01-27-2018, 11:34 AM
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Thanks. I can only work in 2d, havent learnt 3d yet. Its has its limitations but works ok for what i want. I'll try and get some side and top profiles.
Yes ive used 3mm carbon tube for the diagonals on the top and bottom crutch. Very light and adds a lot of torsional stiffness.
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Old 01-28-2018, 03:56 AM
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Originally Posted by ltc View Post
Is this the Contra you are referring to?
It looks like a Q80 with a Contra added on? Very different looking.

https://www.youtube.com/watch?v=XE6-MLe2bWc

Hi,
It looks like two motors with the front one having a hollow shaft and the rear driving a narrow shaft that passes through the front motor.
Two ESC's req'd !!
Weight ??

Brian
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Old 01-28-2018, 01:21 PM
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Hi Brian yes 2 motors 2 escs. I will weigh it (its currently in another model) but its not heavy. Each esc is smaller (60a size approx) than a typical 100a and theres no gearbox/ belt drives with mounts etc to deal with.
Theres also only 2 moving parts, no maintenance required.
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Old 01-29-2018, 06:42 AM
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Took the TMCR out of the other model, the 2 motors weigh in at 732g. With the 2 props and 2 esc's its 912g.
When im the stage of being to mount the motors i'll do a step by step of how its installed.
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Old 01-29-2018, 08:26 AM
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912g seems "heavy" compared to existing Contra products currently available
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Old 01-29-2018, 08:33 AM
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With props and esc's?
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Old 01-29-2018, 08:51 AM
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The Adverrun with props and spinners is approx 770g?? Add on an esc approx 140g thast 910g. That might be heavy too i dont know, i've not had much experience with contras.
Started the sheeting now, easy bits first, i'll have to plank the nose which i dont like doing :-(
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Old 01-29-2018, 10:01 AM
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You're right ...
im just not used to adding in ESC when looking at Contras
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Old 01-29-2018, 10:14 AM
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Ah i tend to include the esc's with this contra as you cant really use them with anything else.
The designer (Adam debowski) has also modified each esc to give a constant rpm at any throttle input. i.e if half throttle is say 2500rpm, it will stay at 2500 rpm if its climbing/diving/straight and level etc.
I think hacker are developing something similar or may even have it out now, not sure.

Dan
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Old 01-29-2018, 10:36 AM
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I think the ESC you are referring to is the Hacker Senstrol
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Old 01-30-2018, 11:05 AM
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More done today, planking the nose was a pain but it turned out ok.
Fin worked out well also, mainly thanks to a technique i borrowed from Adrian Mansell on the gbrcaa forum
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Old 01-30-2018, 12:25 PM
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2d view of what it will/might look like
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Old 01-30-2018, 02:37 PM
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Very nice craftsmanship, Workers!! I love seeing all wood builds! Will you be kitting or even selling plans? Could you post a link to the 'Mansell' technique, please.
I am following closing... looking forward to the finished airplane and flight report.
Regards,
Will
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Old 01-30-2018, 02:54 PM
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Thanks Will, i havent really thought about kitting it yet, we'll see how it flies first i guess!
Heres the link to Adrians build thread (Lepton), very interesting thread, great flying plane too.
Lepton Build Thread
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Old 02-02-2018, 08:25 AM
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Up on its legs now, its getting big. Nearly finished the sheeting underneath, next big job is cutting the canopy out, not looking forward to it!
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Old 02-03-2018, 09:38 AM
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Done most of the horrible bits now. Finished the bottom planking, its ok, bit of filler needed but i can live with it.
Cut the canopy off, came of ok and has come out very sturdy. Which is good as it will add to the rigidity of the fuz.
Still a bit of facing to do on the canopy and put the latches on, cut and face the rudder and the fuz is pretty much there.
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Old 02-04-2018, 01:22 AM
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Incredible work Dan, and also very fast ! What's the thickness of the fuselage sheeting?
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Old 02-04-2018, 02:33 AM
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Thanks Alex, i've used 2.4mm (3/32") contest grade. A 36"x4" sheet is averaging about 17g.
Makes a big difference on the final weight. I've bought 50 sheets for this build, if each one was soft to medium grade @ 27g ish, it would be 500g heavier. Which is a lot.
My last 2 f3a planes (an own design and a krill spark) tipped the scales 5kg with relatively light turnigy 5000 lipos. After a while the lipos started to struggle so if i can get to a weight of about 3500g, i can use some higher capacity lipos.
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Old 02-04-2018, 07:22 AM
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Yes balsa selection is very important. Your balsa is very light; my sheets have different dimensions, but it looks like the calculated equivalent weight is about 6g heavier.
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Old 02-07-2018, 12:02 AM
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Got the fuselage pretty much finished today, canopy on, rudder cut out, faced and hinged. The only thing left is the sleeve for the wing tube.
Really happy with the weight, its come out at 912g with the canopy and rudder which i reckon is pretty good considering the size of it!!

Anyway, heres some pictures....
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