RE: Yak 50cc Weight issues  
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All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> Aero-Works Support >> RE: Yak 50cc Weight issues
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RE: Yak 50cc Weight issues - 6/27/2006 5:10:00 AM   
lazy eight



Posts: 174
Joined: 1/11/2004
From: Freeland, MI, USA
Status: offline 		Show us some pics of your vent mod when done ok?

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       Post #: 51

RE: Yak 50cc Weight issues - 6/27/2006 3:39:54 PM   
Westbender



Posts: 146
Joined: 4/4/2002
From: West Bend, WI, USA
Status: offline 		Here are some pics. I decided to try and just vent it outside the cowl at first before I have to go and "seal" up the fuselage. When the cowl goes on, it actually pushes the diaphram vent hose back and makes it point aft. My fuel vent line goes through a hole in the cowl and points downward.

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(in reply to lazy eight)
       Post #: 52

RE: Yak 50cc Weight issues - 6/30/2006 2:49:16 AM   
lazy eight



Posts: 174
Joined: 1/11/2004
From: Freeland, MI, USA
Status: offline 		Westbender she looks real good. Hows the BME do in this bird? You have a real light airplane it should be a monster.

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       Post #: 53

RE: Yak 50cc Weight issues - 6/30/2006 4:54:56 AM   
Westbender



Posts: 146
Joined: 4/4/2002
From: West Bend, WI, USA
Status: offline 		Thanks!

I haven't really gotten a chance to get completely comfortable with this plane yet. I only had it out to the field once. I tossed it around pretty good doing IMAC type stuff and it's really solid. The more I flew it, the more I loved it. I don't have much in the way of 3D skills, so I can't comment too much on that yet. I didn't really notice any coupling, and I was really surprised at how nice and neutral this plane is except for a little too much right thrust. If I slowed it down on an upline and then gassed it again, it would yaw slightly to the right. If I rolled the throttle up too aggressively on takeoff, it'll yaw slightly to the right as well. First airplane I ever had where I had to feed in left rudder in those circustances. When I had the cowl off to do the vent mod, I went ahead and removed a little right thrust. I'll go a little at the time until I get it perfectly neutral.

As for the BME on this plane, it's gonna rock once I get it dialed in. I love this engine. It handles so nice and the weight is fantastically light for such an "industrial tough" motor. I did have the mixture problem in flight due to the high pressure inside the cowl, but it ripped pretty good anyway. I hope to get out this Saturday, re-tune the carb and fly the crap out of it. It already had good vertical even with the mixture problems. I'm sure it's gonna "snort" pretty good now that I've got the vent mod done. I was also running a 22x10 mejzlik. I've got a couple of different 22x8 props on their way so I can try and find the right combo. I like flying slow and the mejzlik has a tad too much pitch for my taste. I think a 22x8 or 23x8 should work pretty good.

I'll let you know how it goes after my next flying session. First priority is getting the engine dialed in, then getting to know the flight characteristics some more. I'd like to see just how much grunt this motor has pulling out of a hover too. Didn't get to try that last time out.

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       Post #: 54

RE: Yak 50cc Weight issues - 6/30/2006 4:59:38 PM   
lazy eight



Posts: 174
Joined: 1/11/2004
From: Freeland, MI, USA
Status: offline 		My DA is running a 23*8 Xoar and it pulls real good. 6400 rpm on the ground. I think you will like the 23*8 the best once you get eveything dialed in. I,m still moving the Cg around a little bit. Mine is a bit nose heavy after my repair mod but its real close to where I think it should be. I moved my ignition battery back a little more will see this Sunday how thats working out. It really is a nice flying plane its real sold and tracks nice I have not seen that right pull in mine like you have maybe its because you are on the ligher side. I,m a BME fan as well I have the 1.10 and looking at the new 55cc when it comes out I would like one of them to put in the new QB 260 50cc. I have my 1.10 in a 85" Pitts. Its still under construction.

< Message edited by lazy eight -- 6/30/2006 5:00:58 PM >

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       Post #: 55

RE: Yak 50cc Weight issues - 6/30/2006 11:45:27 PM   
Westbender



Posts: 146
Joined: 4/4/2002
From: West Bend, WI, USA
Status: offline 		Yes, BME's rock! I've got an original 100cc twin. It's actually NIB. Been on the shelf for quite a while, but it's headed for a 33% Edge. Hope to have it finished by the end of July.

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       Post #: 56

RE: Yak 50cc Weight issues - 7/5/2006 7:01:27 PM   
Aerohead



Posts: 532
Joined: 10/4/2002
From: Columbus, GA, USA
Status: offline 		Mine turned out at 17.2 lbs. with the DA-50, two 2400 Fromeco Li-Ions, Hitec 5945s on ailerons and elevators, 5955 on rudder, JR 4721 on throttle. This weight is box stock, with wheel pants and no lightening tricks, except the CF wing tube from Aeroworks. It balanced right on the CG called for, but I have a little elevator sensitivity problem. I may need to move the CG forward slightly. It has plenty of power with the DA-50. Once I get the sensitivity problem worked out, it's going to be an awesome flier. I am going to reinforce the area between the wing tube and motor box with CF, though, to attempt to avoid a main gear failure.

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       Post #: 57

RE: Yak 50cc Weight issues - 7/5/2006 7:07:53 PM   
flatlandmike



Posts: 1146
Joined: 10/6/2003
From: lexington, KY, USA
Status: offline 		Dam you used the wheel pants too yours would be in the 16# 10 oz area with out those. Im to jealous

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       Post #: 58

RE: Yak 50cc Weight issues - 7/5/2006 7:12:09 PM   
Aerohead



Posts: 532
Joined: 10/4/2002
From: Columbus, GA, USA
Status: offline 		Sorry, Mike. I just got lucky, I guess. I would like to try some good quality CF gear on it, but I'm not buying that Graphtec gear from Aeroworks. I've just heard too many horror stories about them (Graphtech).

< Message edited by Aerohead -- 7/25/2006 5:14:29 AM >

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Nick Jones

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RE: Yak 50cc Weight issues - 7/5/2006 7:16:58 PM   
Aerohead



Posts: 532
Joined: 10/4/2002
From: Columbus, GA, USA
Status: offline 		One thing I did, though, was use the JTec Pitts muffler. They're a good bit lighter than the Slimline and Bisson Pitts mufflers. That was some savings there. Also, they are way quieter than the stock DA mufflers. A couple of my friends are using the stock DA muffs on their planes and the exhaust sound is pretty obnoxious. The weight penalty was only 3 ounces over the weight of the stock DA muffler.

< Message edited by Aerohead -- 7/25/2006 5:15:45 AM >

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Nick Jones

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RE: Yak 50cc Weight issues - 7/9/2006 6:12:23 PM   
jim190


 

Posts: 2
Joined: 3/20/2005
From: Monkey Island, OK, USA
Status: offline 		A friend and I bought the Aero-Works 50 cc Yak 54. He has a DA 50 And I got the Evouloution 58. His came in at 19lbs 14oz carrying 24 oz of fuel. It flew great,good power for vertical and adequate power to pull out of a hover.

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       Post #: 61

RE: Yak 50cc Weight issues - 7/13/2006 3:04:18 PM   
Aerohead



Posts: 532
Joined: 10/4/2002
From: Columbus, GA, USA
Status: offline 		That's still 18 1/2 pounds dry. Guess I lucked up and got one of the light ones.

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Nick Jones

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RE: Yak 50cc Weight issues - 7/13/2006 3:20:30 PM   
bubbagates



Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline 		I have just about everything I need to get my replacement in the air (red one). The only difference is instead of using a DA50, I'm going with the new 3W 55i, especially since the price is really good right now on Aircraft International. I also got the 3W header and I have an MTW canister.

I'm pretty much pulling everything of the first one that is salvagable like the control horns, servos and such and just installing it right onto the replacement.

Basically the setup will be

3W 55i
3W header
MTW Canister
3W 22x10 prop
JR2000 Synth receiver
JR 8611's on all surfaces
Hitec 6575 (I think that's the number) for the throttle since it's 10ms on 6 volt
JR 537 on the choke
Fromeco 2400 on the ignition
Twin Fromeco 2400's on the reciever
Smart-fly failsafe Badger switches all around

I expect I'll see 19lbs but with something like 30 to 35 pounds of thrust, well, what can I say

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       Post #: 63

RE: Yak 50cc Weight issues - 7/13/2006 3:32:16 PM   
Westbender



Posts: 146
Joined: 4/4/2002
From: West Bend, WI, USA
Status: offline 		I flew my Yak for the first time since I did the carb vent modification. Wow! What big difference in the engine. Those big open cowls sure do pressurize a lot. I even had large exit holes, but it wasn't near enough. Before the mod, the engine wouldn't even pop during throttle-back down-lines, and hesitate, spit and burble something awful when throttling up. Now I can hear popping all the way and the engine comes on immediately when asked. Almost all of the low and mid-range burbling and sputtering is gone too. I love it!

Now I can concentrate on having fun flying the plane. It sure does fly nice with the BME 50. I switched props from the Mejzlik 20x10 to a BME 22x8. Very nice combination. Flies slower, but has a little more vertical grunt to it.

(in reply to bubbagates)
       Post #: 64

RE: Yak 50cc Weight issues - 7/13/2006 6:24:03 PM   
Westbender



Posts: 146
Joined: 4/4/2002
From: West Bend, WI, USA
Status: offline
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