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Brent Good Custom Airframes 50cc Yak 54 - 8/16/2007 10:48:56 PM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		Hello every one!

This will be the build thread for my new 50cc Yak 54 kit that I will be offering through Greg at Charlotte Aircraft Modeling. This will be the place to see the build sequence, ask questions and post your thought on the plane. We are currently working on getting another plane in the air that has the latest updates from my original design. That plane should be flying in a week or so. I will be cutting a new plane and will do a full build on this thread with pictures of all the steps. Once the build is complete we will probably put all that info into a PDF file that you can down load. We are hopeing to have the plane ready to take orders in November with deliveries starting in December. We are starting to get some early interest and some pre orders. Since we will be doing all the cutting localy in the Charlotte, NC area you won't have to wait for the next "container to leave China or get through customs". We will be offering the plane with either unsheeted foam cores or with the core sheeted. All the sheeted parts will be vaccume bagged and sheeted with contest grade balsa. I am flying the prototype now and all I can say is wow!!!! Everyone that has flown it has said that it was the best flying 50cc plane they have ever had their hands on.

Here are some specs.

87" wing span
1420 sq" of wing area.
DA 50 with Bisson Pits muffler
2 2000mha NimH for radio on board
1 1100 mha Nicad for ignition.
24 oz fuel tank
Carbon wing tube, stab tube and gear.
ht5985 ele and ail
ht5955 rudder
ht5245 throttle

Flying wieght is 16 lbs 6oz dry.

Here are some pictures of the prototype.

Fly Hard!!

Brent








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< Message edited by Brent G -- 8/18/2007 2:57:17 AM >
       Post #: 1

RE: Brent Good Custom Airframes 50cc Yak 54 - 8/16/2007 11:53:11 PM   
Rfabbre



Posts: 186
Joined: 9/26/2004
From: Roseville, CA, USA
Status: offline 		Looks very nice. How much will it cost?

(in reply to Brent G)
       Post #: 2

RE: Brent Good Custom Airframes 50cc Yak 54 - 8/17/2007 12:45:03 AM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		We are still working on the pricing. It should be competative with other 50cc size planes. We will know more once we figure out how many we can cut from a 4x8 sheet of light ply. We are also talking to suppliers to see if we can get a discount on materials.

Brent

(in reply to Rfabbre)
       Post #: 3

RE: Brent Good Custom Airframes 50cc Yak 54 - 8/27/2007 12:47:26 AM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		We flew the yak at our giant scale flyin over the weekend. Brian Hanna was there and was kind enough to do a little flying with the yak. Here is a link to the 10min video of his second flight with the plane. It was kind of a last minute idea to shoot some video with a hand held digital camera. Some of it is kind of hard to see but other parts show what the plane can do. Brian said that the plane flew great. I just had the DA 50 in the plane rebuilt with a new ring so it is running a little rich with about 50oz. of fuel through it so far. The prop is a 22B Vess.

I had 3 guys order planes at the event after seeing it fly. The flights Brian made were with the cg moved forward from my original postion. The plane does not need to be set up tail heavy at all. I moved the cg forward about 1/2" from the original balance point. I have made a couple of small change to the plane and the next one that has the changes incorporated into it is almost ready to fly. It should be up in the air next weekend. Once I am satisfied with the changes we will be cutting the first kit and will post the build sequence. That plane will also help determine the price. Keep checking in for updates and post any questions or coments.

http://www.charlotteaircraftmodeling.com/kitsandplans.html


Brent

(in reply to Brent G)
       Post #: 4

RE: Brent Good Custom Airframes 50cc Yak 54 - 8/28/2007 5:48:28 AM   
cam-flyer



Posts: 89
Joined: 7/19/2007
From: Charlotte, NC, USA
Status: offline 		Brent,

I put an updated movie on the website to help with the viewing.

Greg

(in reply to Brent G)
       Post #: 5

RE: Brent Good Custom Airframes 50cc Yak 54 - 8/28/2007 12:04:32 PM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		Greg

Thanks, that looks a lot better. We can see what the plane is doing. It still is nothing like seeing it in person. The plane was flown with no mixing. I have been working on designing out the roll and pitch coupling so no or very little mixing would be needed. Brian looked a little suprised when I first told him that there was no mixing in the plane. After flying the plane he agreed with me that it would probably only need 1%-2% to remove what little coupling it has. Also the video was shot with no spoilerons. The way it locks into a harrier is just the way it flies.

Brent


< Message edited by Brent G -- 8/28/2007 12:05:39 PM >

(in reply to cam-flyer)
       Post #: 6

RE: Brent Good Custom Airframes 50cc Yak 54 - 8/29/2007 7:06:18 PM   
bildo baggins


 

Posts: 40
Joined: 9/14/2003
From: LAFB, VA, USA
Status: offline 		Sweet man. Watching for info on kit

_____________________________

Bill Bullock

(in reply to Brent G)
       Post #: 7

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/3/2007 3:18:06 PM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		We flew the next plane with the stab incidence change made. The plane flies better than my first version. This plane was also sheeted with standard weight 1/16" balsa instead of contest grade. It also had the new cowl that is a little heavier than the cowl I layed up. It still needs to have a second battery pack added for onboard equipment. Running a stock DA50 muffler the weight came in at 16 lbs 3 oz. As near as I can figure the contest grade balsa only saves about 4 oz and costs more than double. It looks like we will be using standard weight balsa for the kits unless some one wants to pay the additional cost for contest grade.

The first flight was great. It took 2 clicks up, 1 click of right ail and 1 click of right rudder to trim. We also have found the cg position that the plane likes. 1 1/4" ahead of the wing tube. With the horizontal stab change the plane KE even better than the first version. The plane pulls very, VERY slightly to the canopy. It was only necessary to breath on the elevator to correct the pitch coupling. Roll coupling was also almost nonexistant. With the plane rolled up completely verticle it took almost no ail. correction. Probably 1-2% of mixing would be all that is needed for hands off KE.

The plane lands like a trainer. Set the throttle to establish a gentle sink rate and the plane all but lands itself. The plane has no, I repeat NO bad habits. I have around 20 flights on the prototype and the plane has yet to do anything unexpected. One thing that is very nice is how little coupling there is in a KE loop.

This plane will probably end up costing a little more than some arf's after you cover it and get it all set up. You just can't compete with the Chinese on cost, can't do it, not going to try. If you are looking for a very high quality American Made kit that you can take pride in building and covering your self, this is a plane for you. One more thing I like about the plane is the durability. Most of the arf out there are built very light and have had to sacrafice striength and durability. This plane has the durability of a Carden with out the weight. I had a problem during one of the eary flights and ended up doing a tree landing. When I got to the plane the last broken branch was about 10-12 feet up. The plane dropped at least that far and landed upright on the landing gear. The motor box was completely intacked with only a couple of small cracks in the wood where the main gear bolts to the fuse sides and the bottom gear plate. There was no damage to the rest of the fuse. The plane is tough and light.

I will have some pictures of the updated plane tomorrow.

Stay tuned for the kit pricing and the build photo's and write up.

Brent


< Message edited by Brent G -- 9/5/2007 1:40:42 AM >

(in reply to bildo baggins)
       Post #: 8

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/4/2007 1:51:13 PM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		Here are the pictures of the updated yak that we flew on Saturday.

Brent


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(in reply to Brent G)
       Post #: 9

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/5/2007 1:28:56 AM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		I am almost done with the final cut sheets. Just have to draw up the built up turtle deck and then it's off to Greg to start cutting.

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(in reply to Brent G)
       Post #: 10

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/18/2007 12:02:49 AM   
hdsoar


 

Posts: 49
Joined: 11/20/2005
From: Toledo, WA, USA
Status: offline 		Are we getting close to a release date and price? This one definitely has me curious.

_____________________________

No good deed goes unpunished.

(in reply to Brent G)
       Post #: 11

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/18/2007 12:59:54 AM   
Brent G



Posts: 433
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		We are getting closer! Greg is working on getting the laser speed up. We cut the built up turtle deck and hatch. I just finished putting the parts together on a yak that I am building for my dad. Every thing fits great. We are putting version 2 through it's paces and are very happy with the results. Be patient we want to make sure that every thing is just right. We are trying to build a very high quality plane that you are sure to love!

Brent

(in reply to hdsoar)
       Post #: 12

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/19/2007 10:15:38 AM   
jbflier



Posts: 919
Joined: 2/1/2002
From: Concord Twp, OH, USA
Status: offline 		If 3 guys ordered planes........how much did they pay for them?

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John

(in reply to Brent G)
       Post #: 13

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/19/2007 12:57:21 PM   
Rush7



Posts: 753
Joined: 11/8/2004
From: Chattanooga, TN, USA
Status: online 		Price, Price, Price..........Get us a price so we can throw down on one.

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http://www.crccflyers.org
Huckin'' til it hurts

(in reply to jbflier)
       Post #: 14

RE: Brent Good Custom Airframes 50cc Yak 54 - 9/19/2007 1:00:05 PM