Ultra light Yak-54 plans on the drawing board - Page 8 - RC Groups
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Jul 24, 2006, 10:50 AM
PB #2212
killi thanks for that mate i have flown 4 of them now and love them so much

Malves - email me a copy of the plans plz pal u have me address i want to make one but a tad bigger so that with my gear it wont be a brick lol

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Jul 24, 2006, 12:33 PM
Registered User
Ok, here you go v.3. 35 1/4" WS and 29" long. Modifications to this new version:
- longer fuse
- increased wing area
- increased rudder area
- slightly bigger ailerons

Last edited by Malves; Jul 27, 2006 at 05:34 PM.
Jul 25, 2006, 11:05 PM
Registered User

I'll try to check the weight tomorrow. It should be around 150-155g with a TP4803s, for a 3-3.1oz/sq.ft.
This plane should be perfect for aeromusicals.
Last edited by Malves; Jul 26, 2006 at 12:27 AM.
Jul 26, 2006, 08:10 PM
Registered User
Ok, I've put 2 flights on it today and it flies lighter than the previous version. I don't recommend putting those holes on the depron stiffeners. They are not as stiff as if the holes were not there, and that causes tail twisting. Maybe, if the holes aren't that much together and smaller it could be better, but I say leave it.

EDIT: I've replaced the depron strips last nite with no holes and took it outside at lunch time today. What a difference! I'll see if I can weigh it today.
Last edited by Malves; Jul 27, 2006 at 03:45 PM.
Jul 31, 2006, 02:47 PM
"How old are you?"
Brummeh's Avatar
A week on and my full fuse is all readt to go, it is 145 g without battery or lg...

27g micro cyclon, 2s400 20c pack, 3 x 5g servos, 10a esc, 5ch rx

Lets hope it flys :P
Jul 31, 2006, 03:43 PM
Registered User
Sweet! You may wanna add a lil CF "post" right at the crossing of those CF struts.
Aug 01, 2006, 02:55 AM
Registered User
Aio_1's Avatar
That's very nice.
Aug 01, 2006, 05:52 AM
Mister UHU's Avatar
YAK-tastic !
Oct 03, 2006, 10:21 PM
Registered User
Well, here's version 4 of the Yak. This will most likely be the last update I'll do to it. I really like flying this plane and I can't wait for the indoor season. Actualy, I am building one right now for this next Sunday, when there will be an indoor meeting in a nearby city.

If you build it right and with light weight equipment, you can get this plane to 140-145g (we're talking about a 35 1/4" wing span). Mine with 7.7g servos weighs ~155g. It won't be only light, but also very strong and with very good stifness for a foamy. It's a great plane for freestyle.

Changes from v.1 thru v.4 were:

- bigger ailerons
- CF on the TE
- increased wing area
- increased rudder area
- increased fuse area
- longer fuselage (from 27" to 30")
- little modification to the fuselage design (v.4)

Have fun and enjoy!
Last edited by Malves; Oct 03, 2006 at 10:58 PM.
Oct 04, 2006, 01:00 AM
Off 2 The Edge of Reality
TeamTEOR's Avatar
nice and simple my friend. Got to love a good set of plans. What are you thinking about for a power system for the new one you are building?
Oct 04, 2006, 08:55 AM
Registered User
Originally Posted by TeamTEOR
nice and simple my friend. Got to love a good set of plans. What are you thinking about for a power system for the new one you are building?
Thank you. Same setup I've been using - Park 300, 8x3.8SF, TB-9, TP4802s. I am waiting for the Park 250, so I can replace the 300 and loose ~10g. I am also thinking about replacing the S3110 with D-47.

I am still building mine, and it should be ready in 2-3 days (don't have much time to put on it). I'll have pics then.
Oct 04, 2006, 09:10 AM
Off 2 The Edge of Reality
TeamTEOR's Avatar
Hmmmm.. Do think this will work? Could run it on a 2s700 pack with a 1047? I have one laying around doing nothing. I'll send out for a couple of 5gr servos or find a set of Picos laying around here.

2406-32 1150kv outrunner brushless direct drive motor
Size : Dia 28 mm x L 23 mm
Shaft Size : Dia 3 mm x L 9 mm
Screw Size : M3
Weight : 33 g
KV : 1150
IO : 0.8A (10V)
Efficiency : 70%
Propeller Li-po Battery Current Thrust

1047 2s 6.8 A 310 g

8 x 3.8 3s 6.4 A 363 g

8 x 6 3s 7.8 A 340 g
Oct 04, 2006, 11:16 AM
Registered User
Yup, that setup should work fine. That's more than enough thrust for it.
Oct 12, 2006, 03:07 AM
Mr. Mullins
Hi there

I really like your YAK 54 and going to build it.
Just wondering how I print it out from PDF to right scale with tile?



Originally Posted by Malves
Thanx, bro.

Here is the plan for the Yak-54. This should be final. I modified the wings a lil with more area and bigger ailerons. Adjusted the cut on the fuse where the stab/elev goes in. Adjusted the elevator for more rudder throw. Broke the x-section in more parts to put 2 CF spars on the wing.

I would start with the CG at around 2 3/4" from LE and go from there.

I'll be putting a new one together over the weekend so I can check the adjustments I've made to it.

Oct 12, 2006, 04:51 AM
Plays with Toys
tim_mellor's Avatar
Hi Tomas, Malves and all,

try this conversion to A4 tiled of version 4. I havn't printed it but it should be OK. Just make sure you print it at 100% and don't allow adobe to shrink it to 96% like it does to fit it on the page.


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