RE: New 50cc Yak

RE: New 50cc Yak
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RE: New 50cc Yak - 6/5/2006 9:18:27 PM

Young-RCPilot

Posts: 243
Joined: 3/28/2005
From: hamilton, ON, CANADA
Status: offline

Anybody have vids of there plane yet??? I am going to an IMAC competition in 2 more weeks and hope to try and get some vid of me flying the Yak. Also I was wondering how you mounted the control panel that came with the plane, I want to get a Pilot soon and I want to get the Dash in there to.

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Post #: 976

RE: New 50cc Yak - 6/6/2006 3:28:13 AM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
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I'll try to get together with whaturi and get a video of his, which BTW, he just flew his tonight.

IF you go back he got the one I had, recovered it, fixed an incidence issue with the stabs and stuffed a MVVS 58 under the cowl. I'll let him go into more detail but after a few minor engine issues lets just say the MVVS hauls this plane with power to spare and it was burbling rich almost all the way through the power band. He would pull vertical, plant the throttle and it was gone in a hurry. Once we lean it out a bit more it's gonna be a blast. He did do some minor 3D with it.

I beleive he got it right at 18lbs with this engine. I also looked at his TX and there is not a single click of trim on this plane. He did GOOD and he seemed to be very pleased

< Message edited by bubbagates -- 6/6/2006 12:31:28 PM >

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to Young-RCPilot)

Post #: 977

RE: New 50cc Yak - 6/6/2006 5:03:08 AM

whaturi

Posts: 747
Joined: 11/4/2005
From: harrisburg, PA, USA
Status: offline

i think this engine is great for slightly larger 50cc planes.

bubbagates helped me out every step of the way on this (we fly at the same field). if it weren't for him, the thing would have fell apart in the sky, because i did not lock-tite a single thing on the plane. he straightened me out on that issue and many others.

i like this plane a lot so far. before this plane, i only flew 60 size stuff so it feels a lot different, and better! it is very neautral and predictable, which is nothing new to hear about yaks. i am pretty tailheavy. i noticed that knife edge needed maybe 5% up elevator and possibly 1% aileron mixed to the rudder. it was very easy to fly around it, but i will mix that out eventually. i tried an inverted flatspin and it went well. this plane does a great wall. i am having trouble going easy on it for the break in period with such a capable airframe. it really feels like the yak on g3 to me. which is great!

bill, thanks again, next time you should fly it. john, thanks for quick shipping on the canopy. i will try to get some video on here once the engine is a little further along. people, get this engine!!!!!!!

(in reply to bubbagates)

Post #: 978

RE: New 50cc Yak - 6/6/2006 1:02:07 PM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline

whaturi,

A couple of things I thought about on the way home last night.

First, the fuel usage on the last flight. I do not remember seeing a loop in the vent line from the fuel tank. You were inverted for close to one third of the last flight and with no loop in that line, being inverted will pull fuel out of the tank. Also, like we did discuss, the engine needs leaned just a bit which also used more fuel than normal. Still, all in all, not too bad getting 15 minutes on a 16 ounce tank with a bunch of inverted and full power climbs.

Everyone, he got really lucky on his last flight. About 12 minutes into it he pulled a wall and the engine all but shut off. He got it recovered and pulled out of it. He continued to fly around for about 3 more minutes then landed. Once back in the pits he looked at the tank through the canopy and he had NO fuel left, I mean NONE . He was most likely running on what was in the line.

Second, the smoke tap on the muffler. We should consider removing it for now and just screwing in a bolt to plug that hole. It's not really going to hurt anything since there is a ton of room in that cowl but it is letting very hot exhaust gasses out not to mention some exhaust noise. Once you decide to use smoke then you can just put the tap back in.

Oh, I plan on flying it soon. I was enjoying myself just watching you enjoy yourself.

I have my video camera with me along with my Extra and Sukhoi and my normal compliment of support equipment so if you can make it tonight, we''ll lean out the engine a bit more and maybe get a video shot.

Everyone, like he said, get an MVVS 58 for this thing and bolt on your favorite 24X10 prop. You can go to a 26X10 but the ground clearance is going to be close. with a 24X10, he has about 1.5, maybe 2 inches of clearance when the plane is sitting level on the stock gear and 3.5 inch Kavan wheels.

To the best of my knowledge here is his complete setup.

MVVS58cc
Pitt's smoke muffler (not sure of the brand)
24X10 NX prop (no spinner)
Hitec 5645's on the elevators, rudder and throttle
Hitec 645's on the ailerons
JR537 on the choke
JR 2150 6 Volt battery on the receiver stuffed way back in the turtle deck (this will be moved forward since he was about 1 inch behind the recommended CG)
JR1100 4.8 volt on the ignition sitting on the wing tube
JR700 7 channel receiver
Pete's CF Tailwheel
Pete's CF Wing Tube
Dubro 16 ounce tank, 3 line setup
Stock main gear with 3.5 inch Kavan wheels and no wheel pants
Total dry weight is right at 18lbs give or take an ounce or two.

This plane was completely stripped and recovered. It was determined he lost 8 ounces just changing the covering. He used white a blue EconoKote since the plane is pretty much sheeted everywhere.

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to whaturi)

Post #: 979

RE: New 50cc Yak - 6/6/2006 1:22:14 PM

whaturi

Posts: 747
Joined: 11/4/2005
From: harrisburg, PA, USA
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the only way to fix that tap problen is to plug it with a smoke system. how much weight and dollars would i be looking at for smoke.. ballpark?

bill, i really have to get going on the house, so i don't think i'll be able to make it out tonight. these planes can seriously take all of your time, which is fun, but not when things need done.

(in reply to bubbagates)

Post #: 980

RE: New 50cc Yak - 6/6/2006 1:31:59 PM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
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NO big deal on not making it tonight. I know you mentioned that you may not make it but I also know how much fun you were having. Just let me know when you can and I'll try to be there with the camera.

quote:

the only way to fix that tap problen is to plug it with a smoke system. how much weight and dollars would i be looking at for smoke.. ballpark?

I could not have said it better. I just thought of something, you have currently no channels left to add a smoke system. The only ways I see to open up a channel would be to add a Y cable to the ailerons and you really do not want to do that, use a mechanical setup for the choke, but since you only have that to kill the engine in the air you cannot do that. We had even talked about getting an optical kill for the ignition but again you do not have an open channel for that.

Figure roughly 150 to 200 more for a smoke system if you use a TME or the Sullivan smoke pump. You will need some kind of pump, about another 2 foot of Tygon fuel line, about 6 inches of neoprene line, a one way check valve capable of handling gas or smoke oil, and another fuel tank with a gas stopper and another battery for the smoke pump (you cannot run the smoke pump from the receiver battery). The tank size is dictated by how much you want to use the smoke. On the MVVS figure between 1 to 1.5 of smoke oil per minute if you leave it on all the time. You can mix your own smoke oil or buy it. Luke carries it at the LHS. Depending on the setup, you can figure anywhere from another 8 ounces of weight to close to a pound not including the smoke oil

There are other ways to do smoke systems using a windshield washer motor but we can talk about that when I see you next.

You once asked me why you would ever need more than the 6 channels you have right now, well, above are some prime examples.

Time to get to work

< Message edited by bubbagates -- 6/6/2006 1:41:35 PM >

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to whaturi)

Post #: 981

RE: New 50cc Yak - 6/6/2006 6:41:02 PM

easton24

Posts: 349
Joined: 11/25/2004
From: STEDMAN, NC, USA
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Quick question. About how much space between the prop and cowl should there be for it to be efficient. Is about 1.25 inches enough. I would rather not go any further forward with the bme engine. It is already getting close to the lip of the cowl.

(in reply to bubbagates)

Post #: 982

RE: New 50cc Yak - 6/6/2006 7:32:17 PM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
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I would think that 3/4's of an inch to where you are at now is just fine. I'm pretty sure using the DA50 with 2.5 inch standoffs, mine was something like 1/2 inch

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Bill James
Normal is not something to aspire to, it's something to get away from

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Post #: 983

RE: New 50cc Yak - 6/7/2006 1:43:20 PM

easton24

Posts: 349
Joined: 11/25/2004
From: STEDMAN, NC, USA
Status: offline

Thanks. Did anyone glue in the removeable tail surfaces. I was thinking of going ahead and glueing them in. I would have no need to remove them. I feel this would just be something else to come loose in flight.

(in reply to bubbagates)

Post #: 984

RE: New 50cc Yak - 6/7/2006 1:48:02 PM

bubbagates

Posts: 8162
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From: Elizabethtown, PA, USA
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I thought about it but did not. It ended up being a good thing as whaturi had to redo the stab incidences and gluing them would have made that next to impossible.

So I would say verify all you incidences are set to zero and if they are glue away.

whaturi did use zero everywhere and he needed no trim at all. The stabs were 1 full degree positive off when I had that plane and I needed 1/4 inch of up trim

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Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to easton24)

Post #: 985

RE: New 50cc Yak - 6/8/2006 3:26:28 AM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
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quote:

ORIGINAL: Young-RCPilot

Anybody have vids of there plane yet??? I am going to an IMAC competition in 2 more weeks and hope to try and get some vid of me flying the Yak. Also I was wondering how you mounted the control panel that came with the plane, I want to get a Pilot soon and I want to get the Dash in there to.

I did get some video of whaturi doing some decent 3D flying the Aerotech Yak. Please remember he had recovered it so it does not "look" like it did when it came out of the box

I'll try get a teaser up in a few minutes then post a full video in the next day or two

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to Young-RCPilot)

Post #: 986

RE: New 50cc Yak - 6/8/2006 3:58:11 AM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
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Here is a 2 minute teaser video of whaturi flying his Aerotech Yak

http://www.hiddenhangarrc.com/video/Vincent_Yak_teaser.wmv

I'll have a better one in a day or two

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to bubbagates)

Post #: 987

RE: New 50cc Yak - 6/8/2006 12:37:38 PM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
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See this post

http://www.rcuniverse.com/forum/fb.asp?m=4375942

< Message edited by bubbagates -- 6/11/2006 5:19:22 AM >

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Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to bubbagates)

Post #: 988

RE: New 50cc Yak - 6/8/2006 1:37:03 PM

Aerotech

Posts: 719
Joined: 7/30/2002
From: St. Ptersburg, FL, USA
Status: offline

Hello,

Looks like your have some fun.

Later

John

(in reply to bubbagates)