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

Old 05-14-2006, 08:17 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ORIGINAL: scalebirdman

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?
I haven't flown one, but my GUESS, given what I know about the plane's performance with an OS 1.60, would be that the Quadra 42 would probably be a wonderful engine for this bird. Not sure of the weight of this engine, so you MIGHT come out a bit nose heavy...certainly something to consider at least, and keep an eye out for.


ORIGINAL: dunaman

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"
I had some, but it was garbage (lousy cameraman *heh*). If my new engine gets here in time, I'll have some after next weekend.
Old 05-14-2006, 09:51 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Guys,
The Brillelli 46 in either the EI or standard version is plenty of engine with this plane! I am using the standard magneto version with a BME 20x10 hardwood prop. I have to force myself to do a take-off roll because the engine WILL pull the Yak of the ground within 10 feet! I fly most of the time at around 1/2 throttle. It has unlimited vertical and the all up weight is 15lbs 11ozs. They (Brillelli Engines) are 110% committed to providing after sale support, you will not find anyone better to deal with IMHO!

Happy Flying!

Loopman
Old 05-14-2006, 12:55 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.

_____________________________

Uncas
That makes sense. The "fixed timing" ignition will not retard the firing when starting the engine, and consequently will be more difficult to start. BTW I can't find the page that states the difference is only $20. In the home page it says;
"Price $240 as pictured.
Polished, and with a polished rear dump muffler $270
Polished with either muffler and CH ignition $325
Polished with either muffler and Roy Scholl S/S ignition $385"
That's a $60 difference, but well worth the price since you get full ignition advance throughout the full RPM range.
Old 05-14-2006, 01:08 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Scalebirdman,
I am not a real fan of the Quadra 42. A friend used to have one in a Wild Hare Edge, and at 16.5 Lb AUW it didn't have much vertical performance. He swapped it for a Q52 and now it hovers at 1/2 throtle. Sold that Quadra to a fellow with a 1/4 Scale P47, and it barely took it off the ground before tip stalling. You may be better using the Quadra in a (fairly lightweight) warplane that needs the extra weight in the nose, and use the 3W in the YAK
Old 05-14-2006, 09:12 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Air Tech,
On the page which shows the 25cc and the 46cc. Look below the engine in yellow it says:

"If you would like an EI 46cc click here"

That will take you the EI page. Or click [link=http://www.brillelli.com/brillelli_014.htm]HERE[/link]
Old 05-14-2006, 10:37 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Is anybody flying this Yak with Fuji Imvac BT-43EI? This engine, weight wise, is the same as Evolution 45GX. Yes, 45GX (according the specs) develops 25% more HP, however, do I really need all that power? This Yak will be my first big aerobatic airplane and I will use it to learn IMAC stuff.

Well, since I can not wait for BME 55, I am thinking Evolution 45GX, $600 + $85 + $20 + $30 = $735. Or Imvac 43EI for $430.

My question is, what is the vertical performance of this Yak with Fuji Imvac 43EI?
Old 05-15-2006, 02:30 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Air Tech,
On the page which shows the 25cc and the 46cc. Look below the engine in yellow it says:

"If you would like an EI 46cc click here"

That will take you the EI page. Or click HERE

_____________________________

Uncas
Thank you Uncas,

At any rate the Brilleli is quite a bargain with either ignition.
Old 05-15-2006, 03:08 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I saved $55 over an OS 46 FX ($105) by buying a SuperTigre 40GS ($50), over a 100% savings.... was it worth it... no... not by a long shot.

So what is the delivery on the BME 55? I was hoping to get one for Father's Day....I can wait a little longer anyway, still have a Funtana to set up and a Showtime to start.

Mac
Old 05-15-2006, 05:07 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I saved $55 over an OS 46 FX ($105) by buying a SuperTigre 40GS ($50), over a 100% savings.... was it worth it... no... not by a long shot.

So what is the delivery on the BME 55? I was hoping to get one for Father's Day....I can wait a little longer anyway, still have a Funtana to set up and a Showtime to start.

Mac
Hey Mac,

Sometimes the savings are not worth the lack of quality and support. I can't vouch by personal experience on the quality of the Brillelli and the CRRCPro but most folks that have one say only good things about them. I took a chance with the Evolution 45 since this is a fairly new engine, but I don't regret it. This is a very good engine indeed.

The Fuji 43EI is not a bad choice for the GP Yak, and it's the manufacturer choice. I don't have any experience with the Fuji’s, and the only negative comment I have heard is that they are little too heavy. I suppose the Fuji should be able to hover the Yak, but don't have any idea how strong a vertical pull it will have on the Yak.

I beleive the BME 55 will take quite a while to be on the market. BME problably need to set up their parts suplier and then do some extensive testing before releasing this new product. If I were you, and were thinking on flying this plane before the end of the summer, I'll be looking at some other alternative engines.
Old 05-15-2006, 10:46 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am looking at the article in Model Airplane News from march of 2006 about Fuji Imvac BT-43EI. It says that the engine will turn APC 18X8W at 8500 rpm, APC 20X8 at 7750 rpm. ThrustHP calculator comes up with app. 28 lbs of static thrust for the APC 20X8 at 7750 rpm. That is planty thrust to pull the Yak stright up, right?
Old 05-16-2006, 07:41 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I am looking at the article in Model Airplane News from march of 2006 about Fuji Imvac BT-43EI. It says that the engine will turn APC 18X8W at 8500 rpm, APC 20X8 at 7750 rpm. ThrustHP calculator comes up with app. 28 lbs of static thrust for the APC 20X8 at 7750 rpm. That is planty thrust to pull the Yak stright up, right?
I agree, 28 Lb of thrust will be plenty of power.
Old 05-16-2006, 05:42 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

It is very optomistic to think that engine will give 28 pounds of thrust. The thrust calculators are usually about 30% off in accuracy. I think maybe 20- 22 pounds of thrust would be more in line for that engine.
Old 05-16-2006, 06:53 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

It is very optomistic to think that engine will give 28 pounds of thrust. The thrust calculators are usually about 30% off in accuracy. I think maybe 20- 22 pounds of thrust would be more in line for that engine.
Well even at 22 Lbs. of thrust if the AUW is arround 15 Lbs. you are looking at 1.46:1 Thrust to Weight ratio. That will problably will be enough to hover at almost max power with very little thrust left for pulling vertical. Since Hadjuk bottom line is cost, the O.S. 1.60 or Super Tigre G3250 may have adequate performance at a fraction of the cost.
Old 05-16-2006, 07:12 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

That's fine, but, my point was that 'the 43Ei' will not give 28 pounds of thrust on it's best day even with a tail wind. People should throw away those thrust calculators and get in the real world. With that said, the 43EI should give pretty good low level aerobatic performance on this aircraft. I have a buddy with this aircraft and a Sachs 3.2, AUW was 16.5 pounds, so 15 pounds may be very hard to acquire with the 43EI.
Old 05-16-2006, 07:46 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

That's fine, but, my point was that 'the 43Ei' will not give 28 pounds of thrust on it's best day even with a tail wind. People should throw away those thrust calculators and get in the real world. With that said, the 43EI should give pretty good low level aerobatic performance on this aircraft. I have a buddy with this aircraft and a Sachs 3.2, AUW was 16.5 pounds, so 15 pounds may be very hard to acquire with the 43EI.
I agree 100%. The thrust calculators will only give you an aproximate idea of how the engine will perform. Real world numbers will prove to be very different, and total performance will vary even from similar engines, depending on oil mix ratio, oil type, how well broken in, etc..
Old 05-16-2006, 08:48 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Before I became aware of the Brillelli engines I was looking at the Brison engines. They are not as powerful but they are not heavy either and are cheaper than the high end stuff. They are still $450 - $500. If I went glow I think I would try the OS BGX-1-3500 (2.13). I am afraid that a glow engine on this size plane would eventually cost more in fuel.
Old 05-16-2006, 09:08 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Any of the current light weight 50cc engines will work great on this airplane. Brison 3.2, DA-50, BME 50 or 55, or Evolution 45. If the extra cost between the Fuji and the lightweight 50 is gonna be a strain on the wallet, than I say save an extra month before buying the engine. In the long run it will be cheaper since the 50's will be a engine that can go into any 81 to 87 inch airplanes, where as the 43 EI in my opinion is at it's limit in a 15 pound aerobatic airplane. I am biased since I own one but my vote is for the DA-50.
Old 05-18-2006, 10:31 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Someone knows about a Yak 54 or 55 for .40 or .90 engines?
Where can I found it?
Old 05-18-2006, 11:54 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

ultra RC has a 50 size yak
Old 05-18-2006, 04:57 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Ok, I found it.
Thanks.
Old 05-19-2006, 05:19 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I got a crrcpro in a ultimate GP 1.6 with a 20X8 prop master screw classic and is 16.5 LBS total weith, the airplane hover in a little be over 3/4 throutle, this plane is in a heavy side. A DA-50 will do great in this small plane, I got my DA-50 in a BME Yak54 and I spect to have a blass.
So far I got exelent experience with the CRRcpro 45 but the muffler sucks.
Old 05-19-2006, 11:37 AM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

I
got a crrcpro in a ultimate GP 1.6 with a 20X8 prop master screw classic and is 16.5 LBS total weith, the airplane hover in a little be over 3/4 throutle, this plane is in a heavy side. A DA-50 will do great in this small plane, I got my DA-50 in a BME Yak54 and I spect to have a blass.
So far I got exelent experience with the CRRcpro 45 but the muffler sucks.
Maxun,

Check the folks at [link=http://www.justengines.unseen.org/]Just Engines[/link] for in cowl silencers, pipes , and [link=http://www.justengines.unseen.org/silsjmb.htm]JMB[/link] in fuse canisters. They custom build high performance muffles for a variety of engines. The only problem is that they are British and you loose money on the exchange rate.
Old 05-19-2006, 12:00 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

The difference in price between the CH and the Roy Sholl EI is because of my cost on them. CH gives me a bigger break on price so I pass that along. To tell you the truth, the best throttle responce is with the fixed timing CH. It will still idle great at 1600rpm and starts great. I have not had one kick back on me. They snap from idle to top RPM much faster on fixed timing. I do not think syncro spark is nessisary on them at all.
Old 05-19-2006, 12:00 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

AirTech.
Being British isn't the problem, being American and ordering from Great Britain is the problem.
I jest of course.
Unfortunately, it will be about 6 months before we in the U.K. can purchase the Yak but from what I have seen and read it should be worth the wait.
As a matter of interest the Giant UCD has only just become available here, shows how far behind you lot on the other side of the pond we are.
Mike.
Old 05-19-2006, 10:35 PM
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Default RE: Great Planes 25% Yak 81" 12-lb, seen on Fly3D Magazine

Well well well,

My BCMA SPE40 arrived on my doorstep today...just got her mounted to the nose a few minutes ago. Tomorrow morning I'll finish plumbing the fuel lines, hook up the ignition, and give her a test run...the it's off to the airfield for a few "re-maiden" flights (new Rx/Tx/Motor) in preparation for a flyin on Sunday!!

I'll post word on the BCMA engine's performance tomorrow, hopefully.

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