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About time Zoomer! - 10/16/2007 11:15:59 PM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		This thread will tackle the construction of the Matney Zoomer from Matney models. www.matneymodels.com This airplane was designed for an event called "animal 500" which I am not familiar with other than what the website mentions about it.
My motive for building this plane is I like to go fast but mainly because I like to go faster than the other guy! I want this plane for our club races and I really liked the way it looks. We fly 3 classes of 2 pole pylon once or twice a year at our funfly's and this would fit in the 3rd unlimited\open class.
The Zoomer is offered in 3 differant configurations, a typical 12% 500 square in. hershey bar wing, a 15% full symmetrical hershey bar or a 12% tapered wing which has a longer span at about 60".
I went with the tapered wing. I like the way it looks and really like how these planforms fly.

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< Message edited by vertical grimmace -- 10/20/2007 4:21:57 AM >
       Post #: 1

RE: About time Zoomer! - 10/16/2007 11:25:42 PM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		I do not have all of the material rounded up to fire through this build so hopefully you all can be a little patient. Also I will be trying some techniques that will be new to me so any and all input is welcome. We are all here to learn right!
I have chosen to use a Thunder tiger .46 engine and will add a quarter wave pipe. I will put the aileron servos in the wing but try to streamline them by placing them inside. I want to live skin the hinges at the ailerons, elevator. Yes, I will have a rudder. Probably a tail wheel as well.
From the looks of this thing I think anyone wanting to shoe horn a larger engine will not have a lot of trouble.
I am planning on sheeting the wings with balsa and then cutting the ailerons free. One of the items I am already unsure of is what the actual chord dimensions should be. The foam gets really thin and then a little thick again on the T.E. I think this little extra foam needs to be removed before sheeting the wing. Look closely at the pic in the previous post.

< Message edited by vertical grimmace -- 10/17/2007 6:57:09 AM >

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RE: About time Zoomer! - 10/17/2007 12:44:15 AM   
combatpigg



Posts: 9782
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		This should be a very cool project!
Hopefully an experienced Zoomer builder will chime in and share his experience. I have heard that to get a nice uniform and razor sharp trailing edge, work in a strip of thin plywood before sheeting the wing with balsa.
I have doubts about using a dowel in the leading edge of a speed plane [as a wing hold down], but the designer of this plane obviously has had no problem with it.
Good luck with it!

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RE: About time Zoomer! - 10/17/2007 12:54:50 AM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		Thanks, combat pig. I was planning on using the thin ply. Darn...that was one of my surprises! It really works good.
I hope these pics look OK, I will work that out as I go along.
I am starting with the Fuselage. Here are the templates for the 2 formers and the wing plate for accepting the wing bolts. I will be using 4 wing bolts and no dowels. These will be band sewn and sanded. 1\4" aircraft ply for firewall. I will be mounting my engine using a backplate mount leftover from a Viper arf. It looks like it should work fine.

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< Message edited by vertical grimmace -- 10/17/2007 4:42:42 AM >

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RE: About time Zoomer! - 10/17/2007 4:30:46 AM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		After cutting out the firewall I tack glued it to an end of a balsa stick. This gave me control over positioning it from inside the wing saddle. I had to bail on the idea of using the rear cover quickee mount. It was too big. I now have a typical black fiberglass mount. This works just fine.
I held the engine on the outside of the fuselage with the back of the spinner installed to roughly locate where the firewall would go. I marked this with a sharpie. I also made a rough outline of the engine cutout.
I cutout for the engine using a dremel and cleaned it up with some 100 grit sandpaper. This worked well. After mounting the engine mount I began fitting the firewall where it should go and when satisfied I epoxied it in place with the engine and spinner mounted. I wiped the inside well with denatured alcohol to remove any release agent before applying the epoxy. I took some carbon tow and cut it up and mixed it into the epoxy to add strength to this firewall joint. After it dries overnight I will look at it again and may go over the joint again. This takes a lot of work and you must take your time and plan this install carefully. This is my first try at one of these but I feel it went well.
Next will be the tail section.

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< Message edited by vertical grimmace -- 10/17/2007 4:44:50 AM >

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RE: About time Zoomer! - 10/17/2007 4:40:13 AM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		Here are some better views. I have a very poor photo edit program sorry.

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RE: About time Zoomer! - 10/17/2007 5:39:23 AM   
roadtripessentials


 

Posts: 163
Joined: 11/7/2003
From: north plains, OR, USA
Status: offline 		VG,

Are you instructed to install the firewall first?

I mount the wing first, based off a fuse centerline, that determines my baseline. I can then install the firewall and stab at 0, if that is what is called for. For the Zoomer I would go 0,0,0, as we do our pylon planes.

If the firewall is off to some degree, when you set up the wing and stab off the firewall, the plane may fly at a strange attitude in level flight and turn who knows how.

Just my thoughts.

I have not ordered mine yet.

I want to see how well yours comes out first!!!

Tony

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RE: About time Zoomer! - 10/17/2007 5:57:29 AM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		RT, There are no instructions. I was lining up my spinner with the spinner ring end of the fuse. I gave myself some room if I need to make any adjustments. I will check all of my decalage and thrust settings as I go. I always set all of my incidence with the wing. I will do the stab after the wing is installed and I do my engines last. I may have a lot of faith in the kit's accuracy, but this is how I have always heard this was done. It is important to me to have a nice clean reveal between the fuse and spinner.

< Message edited by vertical grimmace -- 10/17/2007 6:00:07 AM >

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RE: About time Zoomer! - 10/17/2007 5:18:44 PM   
z06kal


 

Posts: 144
Joined: 6/25/2004
From: Woodland Hills, CA, USA
Status: offline 		Vert, I have lined up motors the exact same way and never had a problem. If worse comes to worse you can always throw in a few washers and shim the mount. With a molded fusalage I find it very unlikely that the mold would not be square with the fusalage. Just make sure when you sit the wing mounting that it is also square with the fusalage.

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RE: About time Zoomer! - 10/17/2007 6:40:38 PM   
vertical grimmace


 

Posts: 1143
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline
quote:

ORIGINAL: z06kal

Vert, I have lined up motors the exact same way and never had a problem. If worse comes to worse you can always throw in a few washers and shim the mount. With a molded fusalage I find it very unlikely that the mold would not be square with the fusalage. Just make sure when you sit the wing mounting that it is also square with the fusalage.


That is what I thought as well. If the fuselage is not true than that sort of defeats the purpose of using glass and I would consider it junk. I am sure that it is not though. The glasswork is of high quality and looks very nice.

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RE: About time Zoomer! - 10/17/2007 6:43:05 PM   
samtech



Posts: 194
Joined: 12/21/2006
From: Elk Grove, CA, USA
Status: offline 		Ok, That is a cool! What a little screamer! I checked out that web page.... Anybody know if a 40-45 would fit in to that QM15 AJ-2 T-tail? It's bigger than a LR-1 and those fly pretty good with 40-50 sized motors... I wonder how big around the fuse is....
Vert, are you going to glass over the balsa sheeting or leave it and monocoat it?

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RE: About time Zoomer! - 10/17/2007 7:34:13 PM   
bob27s



Posts: 4814
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		Matney has a 40 size AJ ..... that makes a great aircraft with a sport .46 size engine in it


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RE: About time Zoomer! - 10/17/2007 11:16:39 PM   
rmenke


 

Posts: 1772
Joined: 6/25/2004
From: Merced, Ca., CA, USA
Status: offline 		VG:

You'r doing just fine. The fuse is well done, engine/firewall centering by spinner good. Recommend you get the wing installed and set and use the wing as your datum line 0 for incidence. The elevator is a lot easier to adjust than the wing saddle. Set my engine same as you, checked after completing wing and tail, was 0 with a good incline-0- meeter. Kevin used carbon fiber at the wing trailing edge, think ply would be better for most. Glass the wing center section per instructions, monocote finish. If the guys in your club open class start to close on your speed, install a Jett 60 LX, will fit right