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

Old 05-05-2006, 06:19 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: Don d

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
Don,

I just bought a CF wingtube for mine this week...had to cut about an inch off the end, but it works perfect. I'll get manuf and part number for you this weekend.
Old 05-05-2006, 08:35 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Don,

I just bought a CF wingtube for mine this week...had to cut about an inch off the end, but it works perfect. I'll get manuf and part number for you this weekend.
Hey GB,

I will like to know too on where to get a CF wing tube.
Old 05-05-2006, 08:42 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

No problem, AT. I'll post it some time this weekend, when I get a chance to track down info.
Old 05-07-2006, 05:06 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I have discovered that my covering skills, SUCK..The wing came okay, the covering, oh well...at least it will fly. Damn cowls are backorder until june 25th.... I might hav to buy another kit just for the freakin cowl , Gonna rain here today, that will give me time to finalize the fuel lines and oil lines. I hope I got everything straight... Ill post the results of the test flight..

Dave..
Old 05-07-2006, 07:37 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey guys, the rudder hinge that goes through to the stab, cut it before or after its glued in?
Old 05-07-2006, 07:54 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: zrider

Hey guys, the rudder hinge that goes through to the stab, cut it before or after its glued in?
I cut it after it was glued in. Once you remove the covering for the stab, it's pretty easy to get in there with a dremel and cut it down to allow the stab to go in.

Old 05-07-2006, 07:58 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks gboulton
Old 05-09-2006, 07:58 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Don and AT,

Sorry it took longer than a weekend...flying kept getting in the way.

The CF wing tube I found that works for the Yak is a PBG Composites 30T (or 30TS), 30 x 900. As i said, it' about an inch too long, but that can be cut to fit with no issues. (I'll offer a bit of unsolicited advice here...when you cut CF, CA the cut surface afterwards to keep it from splintering.)

I know for a fact (just checked stock yesterday) that PAC RC in Smyrna, TN has 2 of these on hand (one 30T, one 30TS). I spoke with Maureen Dunphy (the owner) yesterday, and she said if you want one, just give them a call at 615-220-0655 and she can ship it right out.

As a side note, I've done business with PAC for over a year now, and they are phenomenal people.

Hope this helps.
Old 05-09-2006, 09:48 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hey G,
Thanks for the information on the CF tubes. BTW does PAC RC have a website? If they do, please send me the link. Thank you once more.......AT
Old 05-10-2006, 01:12 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

She flys again! I have a little coupling in knife edge, but all around she flys good. The new hitecs on the elev are awsome. I had to put the rudder back on the pull-pull, I moved the smoke tank, and that threw the CG out. Flew all weekend (my weekends are sun-tues) The cowls are still B/O. Oh well, Guess I gotta get a bigger plane .


Dave...
Old 05-10-2006, 07:23 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: AirTech

Hey G,
Thanks for the information on the CF tubes. BTW does PAC RC have a website? If they do, please send me the link. Thank you once more.......AT
Last I knew, they were in the process of rebuilding the site. To be honest, I've never looked at it since the store is 5 minutes from the house *heh*. I'll see Maureen today, and will ask her if they have a current site up, and if so, what the URL is.
Old 05-10-2006, 11:11 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Could you or have you....weighed both wing tubes?
I am curious to see the difference in weights.
thanks!
ORIGINAL: gboulton

ORIGINAL: Don d

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
Don,

I just bought a CF wingtube for mine this week...had to cut about an inch off the end, but it works perfect. I'll get manuf and part number for you this weekend.
Old 05-10-2006, 12:19 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: marmitas

Could you or have you....weighed both wing tubes?
I am curious to see the difference in weights.
thanks!
I did weigh them both, actually. While I do not remember the weights of either, i DO remember that the CF wing tube saved 3 oz.
Old 05-10-2006, 01:06 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: marmitas
Could you or have you....weighed both wing tubes?
I am curious to see the difference in weights.
thanks!
I weighed all components. You can see them here:

Old 05-10-2006, 04:57 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

carbon fiber wing tube is $75. Think I'll wittle one out of an old axe handle.
Old 05-10-2006, 06:22 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Yep...CF ain't cheap.
Old 05-11-2006, 07:58 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Does anyone think this plane will hover with an OS 1.60? There seems to be a huge cost leap from glo to gas engines.
Old 05-11-2006, 09:19 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Does anyone think this plane will hover with an OS 1.60? There seems to be a huge cost leap from glo to gas engines.

_____________________________

Uncas
I feel the OS 1.60 may hover it, but very poor vertical pull out, and will prove to be on the low side of the power curve, marginal at best. Have you looked at the [link=http://www.brillelli.com/brillelli_003.htm]Brilleli engines [/link]. The magneto ignition Brirelli 46 sells for $249. Also [link=http://www.crrcprousa.com/]CRRCProUSA[/link] sells a 45 ccm. engine for $384.95. And this engine comes complete with muffler and electronic ignition included. Tower lists the OS 1.60 w/muffler for $299.99 ($279.99 plus shipping after Towers $20 rebate). The extra dollars you spend now will save latter on the cost of fuel in the long run.
Old 05-12-2006, 10:18 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: Uncas

Does anyone think this plane will hover with an OS 1.60? There seems to be a huge cost leap from glo to gas engines.
Uncas,

I have to agree with AT above. I put a 1.60 in this plane to begin with. It's a good motor for this plane, a real workhorse, and was capable of doing just about anything you could name. HOWEVER, while it WILL hover the plane with the right prop (I ran a 20x8, the largest prop OS suggests for that motor), it takes a healthy chunk of the throttle to do it, and there's just not enough left to pull the plane out. So, i could hang the plane in the air, but recovery HAD to be letting it fall one way or another, and flying out.

Vertical performance with the OS 1.60 is not quite "unlimited". It would certainly take the plane as high as I ever wanted to, plenty high enough for some of those "I'm gonna try this scary move..." moments, but again, it was NOT unlimited.

I've since sold my 1.60, and am awaiting arival of a BCMA SPE40 for mine. Same cost as the 1.60, less than .5 lb heavier, and supposedly 40% more power. It's supposed to arrive next week, so when I get it up and flying, I'll let ya know the differences on balancing and performance and what not.
Old 05-12-2006, 06:35 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Thanks for the info Air Tech and GB! Lot's of options.

I like the Brillelli 46 with EI - $365. You loose 9 oz with EI and it runs smoother at low idle (so they say), and you get a free muffler. I hope these engines are reliable.

I was almost ready to give up on this plane.
Old 05-13-2006, 08:26 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Uncas, I was one of Scott's first customers, Now called Brillelli engines. His product is superb, he stands behind his work. I ran the little 25cc toro conversion on a funtana 90. Never a problem. You will not be dissatisfied with his engine. I am picking up the 46ei with the scholl ss. Going to put it on my second GP yak. I want to compare it to the DA50 on the one I have now.

Dave..
Old 05-13-2006, 12:57 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Uncas, I was one of Scott's first customers, Now called Brillelli engines. His product is superb, he stands behind his work. I ran the little 25cc toro conversion on a funtana 90. Never a problem. You will not be dissatisfied with his engine. I am picking up the 46ei with the scholl ss. Going to put it on my second GP yak. I want to compare it to the DA50 on the one I have now.

Dave..
Dave,

I was wondering. What's the difference between the C&H Ignition and the Scholl S/S ignition? I see there is a $60 difference in price, but what does it buys you? BTW anyone have any experience with the CRRCPro engine? It looks very attractive, comes with muffler, electronic ignition, and even a carburetor trumpet. The performance figures look very good also. 7500 RPMs probably with a 20 X 8 is not bad. ThrustHP calculates a Zinger wood prop producing 3.4 H.P., and almost 24.5 Static Thrust Lbs... At 16 Lbs the GP Yak will carry 31.3 oz. per square feet, with a thrust to weight ratio of 1.5:1. If one can shave a couple of pound from the AUW, the CRRCPro 45 would be a viable alternative to the DA 50.
Old 05-13-2006, 10:28 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Hi All,

I just finished my Yak 54 and I put an OS 160 on it, but I didn´t fly yet. I am looking for videos of this plane flying, Did someone made it?
I just found this video from GP: "http://www.greatplanes.com/gallery/index.html"
Old 05-13-2006, 10:39 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Air Tech,

Read the print below the EI engine. The CH Synchro Spark ($365) and the Scholl ($385) allow a lower idle. The $325 version offers a CH EI and says fixed timing. So I will likely go with the $365 version. The real question is what is the diff between the Scholl and the CH synchro spark which is only a $20 difference.
Old 05-13-2006, 11:23 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Since you guys are talking engines... I just won a Yak in an raffle at my clubs fun fly today. I have two choices for engines: A Quadra 42, or a 3w50. I'd prefer to save the 3w for a warbird project, but don't want to be dissapointed if I use the Quadra. How much vertical performance should I expect out of the Quadra? Thoughts?

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