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RE: GREAT PLANES YAK 54 BUILD THREAD - 4/21/2007 12:14 AM   
walterPPK



Posts: 391
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From: Panama, PANAMA
Status: offline 		Can I join you guys here?...

I just bought a YAK-54 from GreatPlanes, with a DA-50. Here in Panama that all added up to US$1,400.00!.

Anyway it is money well spent.

I'm gonna start by removing almost all the Monokote, leaving the plane all white, then I'm going to do a nice BUDWEISER theme on the top and a BUD Light theme on the bottom.

I'll post pictures of the finished product in a few weeks.

Check out my CocaCola CAP 232 to see what I'm trying for...

http://www.rcuniverse.com/forum/m_5689561/anchors_5689561/mpage_1/key_cocacola/anchor/tm.htm#5689561



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Check my Pilot RC Yak54, Build Threat here:
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RE: GREAT PLANES YAK 54 BUILD THREAD - 5/28/2007 11:52 PM   
Aeromove



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From: Heerhugowaard, NETHERLANDS
Status: offline 		Hi All,

Any ideas if this baby will rock on a Zenoah G45?
I've got a G45 in my garage now after last weekend crash of my Midwest extra300S.

Cheers,
Thierry

< Message edited by Aeromove -- 5/28/2007 11:59 PM >

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RE: GREAT PLANES YAK 54 BUILD THREAD - 5/29/2007 5:14 AM   
fingers73



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From: Kent City, MI, USA
Status: offline 		OH yah, I flew mine on a fuji 50 with great results. It was my favorite plane to fly, way better than my Wild Hare.

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RE: GREAT PLANES YAK 54 BUILD THREAD - 5/29/2007 7:44 PM   
Aeromove



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From: Heerhugowaard, NETHERLANDS
Status: offline 		Does it hoover?

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       Post #: 79

RE: GREAT PLANES YAK 54 BUILD THREAD - 5/30/2007 4:59 PM   
fingers73



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From: Kent City, MI, USA
Status: offline 		yes on a 20x8, even better on a 21x8 bolly.

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RE: GREAT PLANES YAK 54 BUILD THREAD - 5/31/2007 6:15 AM   
orstraycat


 

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From: Albany, OR, USA
Status: offline 		I have a OS BGX engine looking for a home. I like the GP Yak 54 and this thread has very good info but nothing on using this engine. What do you guys think? Is the OS BGX to much for it or will I be a happy camper?

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RE: GREAT PLANES YAK 54 BUILD THREAD - 5/31/2007 8:24 AM   
fingers73



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From: Kent City, MI, USA
Status: offline 		I would think it would work just fine. A guy I fly with has a Goldberg Obsession with the 1.60 in it. That is a great combo and much lighter than the yak.

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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 1:03 AM   
Shubova


 

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From: Covina, CA, USA
Status: offline 		marmitas

I read your post about the cracking around the screw holes in the fiber glass cowling. I see that the post was couple of years ago; I hope you're still around. I’ve had the same problem plus losing screws from engine vibration. When I read your post an idea instantly came to me and I wanted to see what you think.
I idea is to create a rubber dampener. Drill a holes in the fuselage about 3/16 or ¼ inch dia. at the points were the cowling screws go. Then take a round piece of rubber with a hole in it and glue one in each hole in the fuselage. Now you can put in the screws to hold the cowling. Do you think it would dampen the vibration enough to stop the cracking? I think I’ll try it on one of my planes.
Anyone else is welcome to comment!

Happy Flying!
aerosman


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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 1:07 AM   
Shubova


 

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Status: offline 		Sorry
In the last post I ment to say, My idea is to create a rubber dampener.
aerosman


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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 2:56 AM   
marmitas



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From: Webster, NY, USA
Status: offline 		While it will be an improvement, it will only delay the damage to the cowl. I made a drawing of something I did on another airplane and worked for me. It is attached as a PDF file.
By the way I noticed that you live in Upland, I used to fly with a club in Chino.

Attachments
Click to see the file in new window.Attachment.pdf


< Message edited by marmitas -- 6/24/2007 4:02 AM >

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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 4:01 AM   
Shubova


 

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From: Covina, CA, USA
Status: offline 		That would be great.
Is that the field that is next to Prodo Lake. I've been there but never flew it.
I'm with the Corona R/C Club. www.coronarcclub.com We fly at a place in Norco. It's a dirt field but the scenery is great.
Thanks,
aerosman


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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 4:06 AM   
Shubova


 

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From: Covina, CA, USA
Status: offline 		Just pulled up you drawing. That's a very good idea I thing I'll give it a try.
Thanks,
aeosman


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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 7:04 AM   
fingers73



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From: Kent City, MI, USA
Status: offline 		If you want to simplify things go to your local Napa and get bonded washers. I use these on all my planes. It is a washer with a oversized hole and rubber fused to the back side. I am sure all will love them.

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RE: GREAT PLANES YAK 54 BUILD THREAD - 6/24/2007 11:39 PM   
Bass1



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From: Va.Beach, VA, USA
Status: offline 		Would any of you Great Planes Yak owners know the weight of the wheel spats included with the kit?

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RE: GREAT PLANES YAK 54 BUILD THREAD - 8/27/2007 1:48 PM   
Bigsasquatch


 

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From: , UNITED KINGDOM
Status: offline 		Hi,

Just wondering how much room there is from the centre vertical thrust line to the edge of the cowl ?

Thinking about a MOKI 210, but the head height is taller than the OS 160. Didn't want to mount inverted, wanted to go same config as side mounted OS160 with pitts so I don't have to side cut that lovely cowl.......

Could a 210 squeeze inside withiout cutting ? ( 96.7 mm for the OS, 118 mm for the MOKI 210 )

Thanks

BIG S

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/4/2007 11:15 PM   
Pilot013


 

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From: Sofia, BULGARIA
Status: offline 		Hello dear friends!

My name is Boris and I am from Bulgaria. I have a GP Yak-54 like yours. I have put a Fuji 50 EIS engine. I flown the plane several times and everything is great. However I noticed some strange things in my opinion. The plane takes off at about 50% of power and can fly in horizontal flight at about 20%. When the question comes to vertical maneuvers especially Hovering even at full power the plane doesn't have unlimited vertical flight...hm...any suggestions?! Also I noticed that when approaching to land the plane flies fast even at 0% power and I need to extend flaps for successful landing. This appeared when I changed the prop from APC to Master screw wooden one. Any comments about these issues, because I really want to see the plane hovering and having more power! I'd like to hear the commentary of all Yak-54 Fuji 50 owners!

Thanks in advance! Hope to hear from you very soon!

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/4/2007 11:44 PM   
Aeromove



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From: Heerhugowaard, NETHERLANDS
Status: offline 		Hi,

I fly this bird with a ZG45 and spinning a 22x8 Menz and it does have unlimited vertical. Not that fast but it goed and goes until it reach the clouds. I'm in the middle of trying to hoover. I'm kind of ready to try it out after a couple of weeks succesfully try to hoover a flat-out. I hope the weather will help me soon, so I can try it.

Your engine is kind of the same as I got I think. This Menz 22x8 is running about 7300 RPM on the ground.
What I do find noticable is the wingrock it has. Maybe other know about this issue?

Cheerz,
Thierry



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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/4/2007 11:48 PM   
Pilot013


 

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From: Sofia, BULGARIA
Status: offline 		Hi!

Well my prop now is master screw 20x10 (wood). Several days ago I received my new APC 22x10. Do you think it will be better than the wooden one? Unfortunately I don't have a RPM meter but I'll buy soon...

Best regards!

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/5/2007 12:05 AM   
Aeromove



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From: Heerhugowaard, NETHERLANDS
Status: offline 		Hi,

Just try them all. I tried a 20x10 also and found out it has a little more speed but also a considerable less vertical.
Above all it slowed down less easy while doing a final. This is cause by the high pitch.
For 3D and vertical performance you need the largest available prop you can handle. For us I think it will a 22", If you try more you will cut grass when going up.

Just try your 22" version. The worse what can happen, will be that this prop will be a huge load on the engine. You will notice less rpm and slow pick up time. Then you must try a prop with less pitch.

Cheerzz,
Thierry


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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/5/2007 12:22 AM   
Pilot013


 

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From: Sofia, BULGARIA
Status: offline 		Hi again!

Well I think that you are right. Maybe the new APC 22 x 10 will handle better. But I noticed that the APC is heavier than the wooden. I hope that this will give however good vertical performance not the opposite?! I have another issue to share with you. I revised that from 50% to 100% the rpm of the engine are changing with few only. So actually there is no big difference if the engine is going on 55% or 100%. Si I want to solve this thing...Can somebody help? In the same time the valve in the carburetor is opening from 50%-100% however this doesn't give any result in the engine behavior. Please could you explain to me a bit about the pitch of the pro p you mentioned?


Best regards!

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/5/2007 1:46 AM   
rigofly



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From: Florence, ITALY
Status: offline 		Hy everybody and sorry for my english. Interested to GP YAK but I would know how many inches is the cowl internal diameter for engine selection.
thanks in advance, regards
Riccardo

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/5/2007 11:28 PM   
Aeromove



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From: Heerhugowaard, NETHERLANDS
Status: offline 		Hi Pilot13,

About your engine problem? I have no idea what it can be. Maybe you must modify the servo travel on your transmitter to justify the workable range on your engine.
About the pitch:

A pitch of for instance 10 inch is the distance the propellor travels when making a complete revolution. Basically it means, the higher the pitch, the higher the speed of your model. The less, the slower it goes.
For an aerobatic airplane we don't want speed but thrust. If you for instance stick with a pitch of 10 inch and a 20 inch of diameter, your engine will easily swing the prop.
The result in your case is a fast airplane, it accelerates fast and slows down difficult and less vertical perfomance.

Instead of this all, you want slow flight, fast acceleration and more vertical. To achieve this, you must lower the pitch. This will take care of the speed part. If you just stick with lowering the pitch it will outrun you engine. So you will have to increase your diameter.
So increasing it by 2 inches which makes it a 22 inch prop. This part will take care of the thrust part.

There is a program called ThrustHP that you may use to compare between props.
http://www.bmaps.net/software/thrusthpv20d.zip

Just calculate the HP of your current engine. If you don't know the RPM of your engine, take 7000 just as an example. Then look at the HorsePower in grey color. Then in the right screen try a different prop with different sizes and/or pitches an djust guess the RPM it may run. Look at the Horsepower in the right screen and modify the RPM until it matches the Horsepower on the left.
If you got that covered, take a look at the bottom in the static thrust box. See the differences between the left and the right.

Example calc of my airplane/engine:

Left Screen:
-----------------
Menz Prop of 20x10 running at 7300 RPM produces 24.85 lb of static thrust.

Right Screen:
----------------
Menz Prop of 22x8 running at 7300 RPM produces 36.39 of static thrust. (More Vertical!!!!)

Remember this static thrust calculation is very positive and is only valid when your aircraft is not moving. When a propellor is actually moving, your RPM may increase in downflight about 15% to 20%. Thus, this calculation will be alot different. But never the less, when your plane is hoovering, it gives you an idea if your combo works.

Take care,

Thierry










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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/5/2007 11:40 PM   
Aeromove



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From: Heerhugowaard, NETHERLANDS
Status: offline 		Hi Rigofly,

Don't be sorry. I make mistakes myself all the time because it's not my native language also.
The cowl: It's about 23 cm in the middle. What kind of engine are planning to use?
I use a Zenoah G45 which is a pretty good combination. It hoovers but it will not rocket away, but it climbs pretty good. after a hoover. So I'm able to escape when it falls out of the hoover.

Here you can look at my YAK for the time being:

http://picasaweb.google.com/thierry.brandjes/GreatPlanesYAK54

Here's a report I have written. It's dutch language, but at least you can look at the pictures.
http://www.fms-spaarnwoude.nl/home/content/view/109/88888934/

Regards,

Thierry

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/6/2007 12:24 AM   
Pilot013


 

Posts: 57
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From: Sofia, BULGARIA
Status: offline 		Hi Aeromove!

Well your resource is more than great! Thanks for the small software and the pictures. I saw that Thierry Brandjes have cut the inner part of the cowl where are located the air flow openings. In my aircraft I haven't cut them, shall I do it? Regarding the prop. I'll change the prop to the 22 x 10 APC right away on the next flight. Do you think there will be a huge effect on the vertical line? (I really hope so, I want to see the plane hovering). To be honest the engine is still in brake-in period so maybe this gives it results too?!


The program is really really exciting and gives good results. We will see in the next flights. As far as I noticed the difference between the 2 props is nearly 1.8 hp which is a lot I think?! So I hope this APC 22 x 10 Sport will give the needed vertical power, what do you think?



Please could you give me some suggestions of how to stick the decals, I stell haven't placed them, but I couldn't understand very well from the manual how to do this esthetic operation.

The plane photoed at the blog you provided is great, nice inner design with the authentic instruments....


Waiting for your reply! Do you have skype? I'll be more than happy to talk with you!

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RE: GREAT PLANES YAK 54 BUILD THREAD - 11/6/2007 10:54 AM   
rigofly



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From: Florence, ITALY
Status: offline 		I'm planning to install the OS BGX1 (35cc) with "banana" muffler and I do not want to cut that beatiful engine cowl. So I need the internal diameter of cowl in order to check if the OS BGX1 fits without cutting the cowl.

Thank you
Riccardo

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