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

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

Old 07-31-2007, 07:42 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

why did u buy the thor ??? u could have gotten a motor that produces 10 more poudns of thrust for the same money and LESS WEIGHT !! DL 50 ........ why why why !?????
Old 07-31-2007, 08:15 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hello all, great thread just started reading.

I got a Brison 2.4 and I'm looking for a plane, wondering if this would be a good fit with this plane. Hoping for 3D performance with the 2.4.

Thanks
Old 08-01-2007, 04:07 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

OK Guys,

I failed to report that GP did replace my Yak. Not sure what caused the crash of post page 35. Due to the great flying weather this year I have been very slow in putting this plane togeather.

I hope to test fly it with some Hitec HS-985MG wing servos. I do not want to see my wings have any issues this time. The hinges are good, The wood is good and now I am sure the servos are strong, fast and good to go. This weekend will tell the story.

I do not want to take home a bag of balsa after 35 sec. of fly time.

Crash99
Old 08-01-2007, 05:00 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

yo maxx, the brison 2.3 is a nice shiney engine with NO BALLS !!! those engines are better suited for warbirds and scale type. u want 3 d, stick to the more exotic, zdz, da dl, 3w the brison will fly it but unless u can get the yak down to 13 pounds im afraid u need more power to pull out. that brison aint gonna cut it im afraid.
Old 08-01-2007, 07:36 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

well i got the motor real cheap like almost free to test for a friend who has a hobby shop,now he is having second thoughts about selling them and on top of that i found out about the dl after the fact.if it if does'nt perform the way i expect it to i have a da that will go right in
Old 08-01-2007, 09:13 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

dont waste yoru time drop the da in and save the brison for a slow plane or warbird
Old 08-03-2007, 05:50 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: dirtrider250

my 22/8 works great 2 or 3 inces of gorund clearance, perhaps work on the landings and a 22/8 will work just fine.
I'm putting a DL-50 in my GP Yak 54 (with stock gear) and I'm trying to find the right prop. to order.

With a 22x8, you say it has 2" or 3" clearance, and others say it barely fits ... so which is it? When the tail is up level (like it's getting ready to take-off) how much clearance do you have?

This is my first gasser and also largest plane so I don't expect my landings to be all that good at first. [X(]

Should I be looking for a smaller high load prop. like maybe a 21x10 Xoar? I'd rather go smaller than risk a prop. strike (I'm still not used to spending $25 on new props ... yet).
Old 08-03-2007, 09:29 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

well my landings arent the greatest but my 22x8 works fine, u can go to a smaller prop but the engine will spin to fast. U dont have to floor it if u can withhold on the throttle then youll be fine. if u cant land that good maybe practice on a cheaper plane until u get it down right. this plane is a kitten to land so as long as u got nice hard pack youll be fine. 22x8 is pushing it on the higher rev side of that dl or a da 5.0 if u are gonna go for a smaller prop u may as well put in a smaller engine. this plane has crazy verticle with a dl50 and a 22/ 8 pitch prop if u go to a 10 pitch yoll probably rip the plane apart if u go full throttle
Old 08-04-2007, 12:09 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Any good clip of that plane on the web??

Let me know.

I doing small progress on mine, I might put the DL50 on this weekend.
Old 08-05-2007, 01:28 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine


ORIGINAL: choopi

Any good clip of that plane on the web??

Let me know.

I doing small progress on mine, I might put the DL50 on this weekend.
[link=http://www.rcuniverse.com/forum/fb.asp?m=6198193]http://www.rcuniverse.com/forum/fb.asp?m=6198193[/link]
Old 08-07-2007, 02:36 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

With the stock gear and wheels ... with the tail up level ... it looks like 13" from the ground to the middle of where the prop. would be.

22 inch prop divided by 2 is 11. 13-11= 2 inches clearance.

DirtRider: I land my other planes fine, but I've never flown one this big ... should be an interesting maiden flight.
Old 08-07-2007, 02:54 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

The included motor mount brackets put the DL-50's prop. hub at 6 3/4" ... acceptable according to the manual.

There's 1/2" between the back of the carb. and the firewall. Did you drill a 3/4" hole through the firewall to get air to the carb. like the guys using the DA-50 usually do?

EDIT:

I suppose I should read the manual before posting

It says it needs 1" clearance, so the answer is yes ... drill the hole.
Old 08-07-2007, 12:55 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

OK, I am finished with mine. 13 pounds and 8 oz. I have a OS 160 in her so where should the real CG be?

Thanks
Crash99
Old 08-08-2007, 09:17 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Here is my Great Planes Yak54 project...

I decided to change the appearance of the model so here is what it looks like so far:

I got DA50 mounted on a reinforced firewall, you can see on the pics that I used a 1/8plywood sheet that went all the way to the end of the fuel tank.

The rudder has the flag of Panama.

The problem I have now is that I used lockTite to fasten the bolts of the landing gear, I wanted to change it for a Carbon Fiber one and when I tried to unscrew the bolts the blind nut inside turned. Now I'm gonna have to rip open the bottom to reach those nuts and be able to change them. And this plane hasn't flown once yet.




I'll post pictures of the finished plane in a couple of days.
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Old 08-08-2007, 10:12 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

looks great leave the landing gear and use a 22/8 prop and youll be fine no need for the other landing gear.
Old 08-09-2007, 12:31 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I noticed your linkage for the throttle is metal, you could get interference, that something that you may want to be careful. Maybe it's just me but I had some interference in the past and now I'm more cautious.

Look good let us know how the first flight goes.
Old 08-09-2007, 08:30 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I don't want to use the stock landing gear, I want something lighter so bought the CF one... remember that I added some wood to the front to reenforced the firewall so I can make up for that with a lighter LG.

The Throttle has actually a plastic link, the Choke is the one that has metal links... I need to fix that.

Glad you guys like it!.
Old 08-09-2007, 09:42 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

saving a few ounces on landing gear isnt gonna help either way on this plane its very forgiving !!
Old 08-09-2007, 06:02 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

i set the cg right on the spar tube dead center if i remember it like 6 inches mine flies great very docile plane to land supprised the heck out of me!!!
Old 08-10-2007, 02:30 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Flyman1948,
Hope you managed to solve all your problems with radio interference.
I had the same problems when istalling my 2.4 FPE into a sig extra 300sx, turned out to be the Ridge ignition, which comes as standard on the 2.4. after replacement all was fine.
I'm curious how the 2.4 will fly the yak. I just recieved a DL50 (chinese version of DA 50 ) great engine! swings 22x8 / 23x8 props same weight. half the price. Not sure which one to install.

Question: If i am installing pull pull on the rudder single servo mid ship, can I use the rudder servo hole cutouts in the tail for my elavator? The only reason I want to do this is that it looks neater and the linkage is shorter. is there any reason why I couldn't ?

8/10/07 3:30 PM
I read the whole thread and couldn't find an answer to the above question. I am considering doing the same setup. Has anyone installed their servos this way? I appreciate any responses. Thanks !!!
Old 08-10-2007, 05:16 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

go for it, there are no rules as long as it balances and flies good , its kool
Old 08-10-2007, 05:41 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks for the response. I'll go for it. Just mounted my DL-50 and it's starting to look good already.
Old 08-12-2007, 06:35 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

wel i lost mine today not real sure just what really happened making a left turn it rolled over to the right i cut power no responce everyone noticed the aeilerons were fluttering then the throttle finaly went to idle about 10' off the ground!!! total loss engine case broke,cylinder ect. all i can salvage it the matchbox and battery regulators it really made me sick!!!!so now i have to get another one great plane to fly i shall return
Old 08-12-2007, 08:31 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Sorry to hear about your crash. Do you think it was radio related?

Carl
Old 08-13-2007, 03:12 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

not real sure was in a left turn headed back to me went to level it out and ir rolled right into a knife edgeand about 4 of us seen the ailerons flapping on both wings???? i cut the throttle and it finally went to idle about 10' off the ground. after the crash both ailerons servos were stripped the 4 that was in the tail still work fine batterys still a 6v.under load through the regulators and radio still works i'm stummped the only thing good about it the engine cases,cylinder,all gaskets will cost $116.00 and i still have the carbon $53.00 20-8 mejzlik prop unhurt???

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