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Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Old 03-23-2006, 06:57 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Please don't say that...
Old 03-23-2006, 11:05 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I was only foolin' around.. I could not resist with that picture of the Chainsaw on the website! Let us know how it works out!
Old 03-23-2006, 12:46 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

They're shipping out the 40cc engines as fast as they can get them, so I'll have to wait a while longer for something to power my YAK.

BTW, my YAK is getting heavier every day (I'm working on my Balsa USA 33% Fokker DVII in the shop and there's a lot of balsa dust in the air!)
Old 03-23-2006, 03:53 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I guess the cat's out of the bag on the Fuji 43. Seems like a good engine. I have one on backorder too - my first gas. Can you comment on your impressions of the Yak to this point? Surely GB doesn't lurk around here . I do enjoy RC Report! Thanks
Old 03-23-2006, 04:52 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

So far the Fuji 43 have has been a real nice engine. On the Yak, it shoudl fly well but mostly for sport. The Ultimate 1.60 I did for reivew here on RCU and Dick's for RC Report and RC Power magazine both exhibited good power with limited climbout from a hover. And that was 14.5 lbs...

The Yak will likely build out a little heavier and thus have even less authority in high alpha maneuvers... for IMAC and sport flying the 43 will do VERY well indeed.

Most 50cc engines like the DA50 will build out to almost identically the same weight, but of course provide much more power... (at a greater cost of course) but would be "insanely" powered on a 15-15.5 lb aircraft...

I finally got my CHP 20x8 prop from Chip Hyde and can't wait to maiden his Tunnel Vision I converted with the Fuji 43... should be a riot at 13.75 lbs...

Here's a thread on the conversion if anyone is interested...

[link=http://www.rcuniverse.com/forum/m_3802952/anchors_3802952/mpage_1/key_tunnel%252Cvision/anchor/tm.htm#3802952]Tunnel Vision on Gas[/link]




ORIGINAL: Flylow

I guess the cat's out of the bag on the Fuji 43. Seems like a good engine. I have one on backorder too - my first gas. Can you comment on your impressions of the Yak to this point? Surely GB doesn't lurk around here . I do enjoy RC Report! Thanks
Old 03-23-2006, 06:00 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Maudib,
You mentioned your GP Cap. I have been looking in vain for personal reports on it. Might be the best place for my Fuji 43 if I can get over the one piece wing. Any chance you might start a thread on it?
Your report on the Ultimate was excellent! Keep it up.
Thanks
Old 03-23-2006, 06:29 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

There is one already started here:

[link=http://www.rcuniverse.com/forum/m_3758914/anchors_3758914/mpage_1/key_CAP/anchor/tm.htm#3758914]RCU GP CAP Thread[/link]

I can participate in it some, I've been so busy with several reviews at once that it's been hard. The 43 would be a great choice for that airframe... A fellow has a DA-50 on his in that thread...

I'm reviewing mine with the O.S. 1.60FX and Pitts muffler...
Old 03-23-2006, 06:40 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

The Yak is ready to take flight. I mounted my old ST-2500 and its running perfectly as usual. (I said perfectly not powerfully. ) It will fly the Yak fine I'm sure. Just limited for 3D stuff. My plane wieghs 13 lbs/ 7oz on my official scale. (Not sure what makes it official) I would think it could be less than 13 lbs with the OS-160. CG might be difficult to acheive without some extra nose weight. I have 3 oz nose weight in mine but my gut tells me I will be removing it after the first flight. Will fly this evening if the wind goes down. When it flys it will graduate from a "thing" to an "airplane". Airplanes big and small seem to have a "spirit" and therefore are more than just a thing.

You guys are still doing alot of talking and not much flying.
Old 03-23-2006, 06:44 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Don, what settup did you use to get her to balance? Pull Pull rudder?
Old 03-24-2006, 09:29 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

3D

If your using a DA-50 pull pull is the way to go. Both bateries are up front. She will balance right on the mark.
Old 03-24-2006, 12:07 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I did the pull/pull. placed the batterie in the motor mount box. Didn't fly last night. wind was 25 to 30. Maybe today.
Old 03-24-2006, 01:06 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Well hopefully it will graduate today. So it can become an Airplane!
Old 03-24-2006, 02:01 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Yeah, i figured as much.... 2 lazy to change it now.... I found that the 2 packs stacked on one another for the R/X on the motor box balances it just fine....
ORIGINAL: evfast

3D

If your using a DA-50 pull pull is the way to go. Both bateries are up front. She will balance right on the mark.
Old 03-26-2006, 10:57 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech,

I'm going to order a set of standoffs for my Evolution 45 this week. What thread size did you use for yours?

Thanks
Old 03-26-2006, 11:54 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech,

I'm going to order a set of standoffs for my Evolution 45 this week. What thread size did you use for yours?

Thanks
Corwin,

I am using 2" standoffs threaded for 1/4-20 on both ends. Two inches will set you up exactly at 7" from the engine box firewall. I used 1" 1/4-20 stainless socket head bolts with stainless hardware. FYI I found out that if you use the BCM wraparound Pitts muffler it will hit the cowl on the lower left corner. The reason it hits is because the engine offset to the left. I ran into the same problem with the TOC 30% yak and the Evolution 58GX. I was able to cut off about 1" from the muffler corner and TIG weld a 1/16" plate, otherwise you have to cut a nasty hole on that beautiful cowl.

I have a local aluminum foundry that specializes in ornamental items, and they are very good TIG welders. If you don't find anyone to do this for you I may be able to help you out and have this folks modify the muffler for you. Next week I'll post photos of the modified muffler so you can see how it looks like.
Old 03-26-2006, 12:15 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Well 5 more flights on her this morning and very happy! I feel the DA getting stronger When I fly the plane she fishtails in the air.

So Im thinking maybe one digital servo for the rudder is not enough?
I do have all surfaces sealed and the pull pull is tight.


What do you guys think?
Old 03-26-2006, 02:57 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Evfast,

Interesting about the fishtailing. Which servo are you using?
Old 03-26-2006, 03:19 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I'm using Hitec HS-5645MG (168.03oz.in) @ 6.0 volt I think that is plenty of torque maybe the servo is defective?

later
Old 03-26-2006, 04:14 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

EV,

Is it new? or did it maybe have a previous life that included a crash? Check the gears if so. I have a 5955 TG, 333 oz @ 6v....hope that does it.

Mac
Old 03-26-2006, 05:22 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

New in the blue box! Maybe to much torque with a 23X8 ?
Old 03-26-2006, 07:43 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Maybe the pull-pull is too tight. Are you using a bellcrank, or are the cables going directly from the servo arm to the rudder? I don't know if it's a baseless rumor or not, but I have heard that 5645's have had problems with their feedback pot. If you have one try an HS645MG and see if the problem is still there. The 645's have 133 oz torque and only .02 sec. slower than the 5645's so it should be good enough for a test flight.
Old 03-26-2006, 07:56 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I have a couple of new servos that I can try for the rudder.
Old 03-26-2006, 08:24 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Evfast, looks like the minimum torque GP recommends for the rudder is 200 oz. (two servos at 98 each @ 4.8V). Don't know if that 32 oz. would make that much difference or not.
Old 03-26-2006, 08:37 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Well I will double up on the pull pull system and use 2 servos with 168oz @ 6.0 will see what happens.

Thanks
Old 03-26-2006, 10:50 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

well mine became an airplane today. Had time for only one quick flight. Only trim was acouple of clicks up. didn't get into trimming the rudder. over all a very docile flying plane. loops and rolls were nice and easy. Couldn't get a straight away stall on low rate as suggested in the manuel and not much of a stall form the higher rate suggested. Mostly tried to get idea of slow fligh chartistics. Knife edge was easy with little or no coupling. Of cource engine quit before I tried anything more.. Glides alot better than I suspected and lands like a feather. I see my pressure tape broke of my muffeler. Just testing my nerve. Should get to fly some more tomorrow. ST-2500 plenty of power for scale like flight.

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