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

Old 05-01-2006, 12:04 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech, I am using the 45GX as well. Are you adding three more cap screws to hold the prop on or are you just going with the three it came with?

I'm also having some balance issues. I'm considering mounting the batteries for the EI module and receiver (both 6V) on the top and side of the box the engine mounts to. Do you see any issues with them being mounted this close to the engine?

Thanks

< Message edited by Corwin38 -- 5/1/2006 5:43:42 AM >
Corwin,

The three cap screws are more than enough, IF you use the included nut and spacing washer. The problem here is that for some reason the washer does not fit inside the cap screws, just by a few thousands. At least mine came in that way. With a late I turned down enough material until it fit. If you don’t have a lathe you can use a bolt and nut that fits and chuck it on a drill or drill press. Use a file to remove some of the aluminum and that should work. You can use the nut and washer alone (no bolts) but I don't recommend that.

In regards the batteries, I don't foresee an RF interference problem. My Rx batteries are against the back of the first bulkhead, and the Ignition battery is right in front of the same bulkhead. Granted, I have installed an ElectroDynamics Research EDR-111 Pow'R Bus Pro servo isolator, but my throttle servo runs directly to the Rx and I have not felt any throttle glitches, and the servos and Rx share the same set of batteries. In the past the only problems with RF interference I have experienced have been created by a loose spark plug, loose plug cap, or defective/broken plug wire.
Old 05-01-2006, 07:49 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Others shouldn't get this yak because it's an ugly not very good airplane. I'm flying mine with a ST-3250. My engine has only about 3/4 gal of fuel thru it. I've flown it 4 times and only had a dead stick on the first flight. Still needs alittle fine tuning, but very satisfied with the Super Tigre. Has started on first flip every time. Will hover OK but alittle slow on the pull out. With more break-in and leaner mixture, I think it will be a great engine for the Yak. Burns about 1 oz/min. Remember the plane doesn't look or fly very good and I should be the only one to suffer owning one.

Don
Old 05-01-2006, 08:19 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: Don d

Others shouldn't get this yak because it's an ugly not very good airplane. ... Remember the plane doesn't look or fly very good and I should be the only one to suffer owning one.


But Don...then we wouldn't be able to have a Yak-Only fly in.
Old 05-01-2006, 10:21 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Im up for that!! Idaho, Tenn, or Kentucky? Idaho's nice and flat, lived there in my AirForce days.. Tenn has some great mountain veiws, Im for ever in gatlinburg, (its keep the wife happy time) But I live here in KY. We have a nice little field. And I have the only GP yak... Oh well, Glad to hear the yaks are flying. My is getting better with evey tank. Dropped to the Mejz 22x8, not as fast but the spin up time is awsome. Might even try the 23x8 Bolly. Cant complain about more thrust.. The da now turns the 22x8 at 7100 rpms. I like this yak so much (my first one) Im thinking of getting the TOC1 35% yak. Huge.. My cg is now at 5 3/4 and she does good. Vert upline roll over and flys out of the invert. Pretty close.. I had to tame the rudder down, to much throw, in 3D. down to 3.5 inches. Buddy of mine is bringing his edge tomorrow, well hoverfest Ill throw up some pics..

Dave..
Old 05-02-2006, 07:30 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

*heh*

Well..let's see...my heart votes for Idaho. I ADORE the SE part, out by Boise. (Though it's anything but "nice and flat" in that part of the state.

My pocketbook on the other hand votes for Kentucky.

My desire to avoid my inlaws at all costs votes for TN.
Old 05-02-2006, 08:24 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hmmm. your right, the mountains are kinda big there. It was really flat at Mt Home, I lived their for six years. One of these days we might just have to do that.
Old 05-03-2006, 06:32 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Very nice weather today. Went to the club field and got some seven or eight flights out (I am loosing count). I like this plane more the more I fly it.

By moving the fuel tank back about an inch she holds tracking perfectly on a 45 upline and downline. The Evolution 45GX keeps performing perfectly. With a Zinger 22-10 it will hover all day long at 1/3 throttle and the Zinger is not really an ideal prop (at most they make good paint stirrers). I didn't tach the engine, but as soon as I receive my 22-10 Mejzlik from Chief I will get some numbers.

I spent most of the flight time checking for trim, though I practiced a bit of the basic IMAC sequence. Seems to me this plane is a perfect entry level option for anyone desiring to do some IMAC competition. It will also fly some very radical 3D stuff if you so desire. Landing is like a harrier all the way to the ground. So far all my landings have been three point landings, no matter how strong the wind is.

Forgot the camera this time, but I should have some photos next time.
Old 05-04-2006, 04:17 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

[X(] Well I did it, the yak went in today. Was hovering about 150 ft and went to climb out. On the pull out the elev servo failed. Brand freakin new futaba 9402, both sides. (metal geared). I was able to get rolled over upright and I jockeyed the throttle to get close to the runway, but alas I tip stalled atthe most unopertune time. Snaped the engine off, clean break inthe firewall. Crushed both wing tips, and ripped the rudder horn out. Its repairable. I just cant beleive that two new servos stripped that easy. Greatplanes recomends, 98in oz of tourqe, these put out 111 at 6v. I tried to get a cowlfrom tower and GP, they are backordered till mid June.. Ill have to fix and fly with the cracked cowl for now. Ill put up some pics today. At least the DA survived..

Dave Greer
Old 05-04-2006, 06:23 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Yeow! Dave...really sorry to hear that. [X(]

Glad to hear the DA's ok though...sounds like you can get her back up in the air pretty soon.
Old 05-04-2006, 07:14 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech,

What spinner adapter are you using? I see that Tru-Turn make a 10x1mm for Moki/MVVS engines. Is this the one?

Thanks
Old 05-04-2006, 08:11 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Here are thedamage pics of my yak.

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Old 05-04-2006, 09:00 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Sheesh, Dave...that's like saying "Here's the pictures of my best friend's dead bloated body".

Seriously, as you said, damage doesn't look too horrible. Certainly doesn't look like it'll take TOO much time/effort/$$ to get her flying again. I'm not even sure it needs a new cowel...that would looks pretty easily repaired...couple of patches, some sanding and painting, and I bet you could make her good as new.

By way of "unsolicited advice", not so long ago I learned the joys of using Dress Liner cloth for glassing. it's CHEAP ($2.99/sq yd at Wal Mart), light, and if you'll simply iron it before working with it, comes out MUCH MUCH smoother than heavier glass cloth, meaning less sanding is required. I'd say a couple pieces of that with some finishing resin would fix that cowel right up, and the paint is pretty readily available.

Hate to see she went down, but at least the expensive stuff appears to have survived. Get her up flying again, so I can come up there and join ya some time soon.
Old 05-04-2006, 11:17 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey Airtech,

What spinner adapter are you using? I see that Tru-Turn make a 10x1mm for Moki/MVVS engines. Is this the one?

Thanks
Corwin,

My Evolution 45 comes with a removable drive shaft that's tapped for 1/4-20. So there is no need to use any adapter with the spinner bolt included in the kit. You are correct. The MVVS and Evolution 45 and 58 cc are 10x1 threads.
Old 05-04-2006, 11:33 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Dave,
I am not too familiar with Futaba servos but you say these are metal geared servos. Did the gears (on both servos) striped/broke in-flight? That is hard to believe from 111 oz torque metal geared servos. Maybe they broke when you cartwheel into the ground?
Old 05-04-2006, 06:27 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Wow,
Sorry to see that! Hope you get back in the air soon. Hard to believe that happened during a hovering manuever! I'd send those servos back to Futaba with a not so loving note!

Happy Flying!

AV8TER2
Old 05-04-2006, 07:28 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Do you think it could have been that the servo gears were weakened from blow back off of the propwash of the DA-50? Then finally stripped? Considering control surface size and the size prop you were using it might be possible. I know Gboulton's Yak isn't that much smaller than my QQ 85" with a DA-50 and they recommend at least 180 ounce torque servos...

True, my plane is a couple of pounds heavier - but I'm really thinking of control surface area. May I ask what your linkages looked like and how much throw you were using? For both to go at the same time, I'd definitely check out the receiver too. If you weren't using a mix and a reversing Y harness that might be somewhere to look also.
Old 05-04-2006, 07:58 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I took in to consideration the throw of the surface. I had it in 3D rate when this happened. Almost 55deg of throw. I thought of the prop wash. I probably did not have enough torque. The rods were hooked to the middle holes of the horns. I am going to the hitec TG servos. I am reinforcing the the horns and will lower the rates. The servos were extremly fast. And I worked the hell out them. I am writing this off as a learning curve, spend thousands building and get cheap at the servos. The ailerons are 9451 digi, 143oz. the rudder is a JR 8611a, I already fixed the firewall, the wing tips get repaired tonite. I can only cover in white for now, I have to order the red and blue. Ill post pics of the repair...


Dave Greer
Old 05-04-2006, 08:23 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: davegr1

I can only cover in white for now, I have to order the red and blue. Ill post pics of the repair...
Dave,

I've got an almost complete roll of the metallic red (Just cut two small patches out of it). From what I can see in pics, it doesn't look like you'd need a whole bunch...If you want to make a guess on how much you need, I'll happily share some and mail it up to you in a tube.
Old 05-05-2006, 12:30 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks AT, I had not even noticed that! Whatever they are paying you.....double it!!
Old 05-05-2006, 08:07 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I just pulled a ZDZ 40rv off of my UltraRC Giles and was wondering if it would be a good match for this plane.
Old 05-05-2006, 08:17 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks Gboulton, But I already have some in the mail, Tower overnight. Along with the servos. Wings repaired, they came out good. I should have it in the air Sunday..

Dave,,
Old 05-05-2006, 08:54 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Good to hear, Dave.

I'm soon to do an engine upgrade on mine, actually...stay tuned.
Old 05-05-2006, 09:29 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks AT, I had not even noticed that! Whatever they are paying you.....double it!!
Hey Corwin, no problem and don't even mention it. And by the way I take PayPal, MO, or cash....... Good luck.
Old 05-05-2006, 09:41 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I just pulled a ZDZ 40rv off of my UltraRC Giles and was wondering if it would be a good match for this plane.
CW, that ZDZ 40 should work great on the Yak. The ZDZ 40 should have plenty of power, and the 20 X 10 prop will provide some extra ground clearance. With the 50 cc size engines one must be careful during landings when running the 22 and 24 inch props. Thrust me, I know from personal experience[]
Old 05-05-2006, 12:22 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Scuffed up my Yak alittle. Throttle arm slipped on the shaft and left me with not enough throttle to fly after a go around on approach to land on my 150' strip. Bent the wing tube. Didn't see one in the available parts in Tower. The Patti E-300 might work, but might be alittle large in dia. Dinged wing tip but easy fix. Messed up wing tube in fusalage but can fix ok with alittle work. Dang, this is too nice a plane to do that too, but risk we take when we fly-em.

Don

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