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Shark XV Build Thread

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Old 09-09-2008, 10:38 AM
  #1  
rainedave
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Default Shark XV Build Thread

This will be a build thread for a scaled up version of my Sure Shark .049 design. The specs are: 40" span; 31.75" length and a .15 for power. We'll have to wait and see how much it weighs.

I always start with the wing; don't ask me why. After removing the ribs from their sheet and sorting them, I pinned down the bottom, Main Spar.

Then I glued the full length ribs to the spar. I needed to place a 3/32" shim under the building tab of the root rib (something I can correct in the laser-cut file, but, it's no big deal).

Next, I glued on the Trailing Edge. It is flush with the top surface of the ribs and does not rest on the board. The first two ribs are 3/32" smaller to accommodate the center-section sheeting and they are centered against the Trailing Edge to allow for the sheeting.

The top Main Spar was glued in next, followed by the false ribs and the top Front Spar. The spars sit up 3/32" above the two center ribs and the sheeting butts against the spars (see photo).

All of this took less than ten minutes.

The next step is to glue on the Leading Edge and add the top center sheeting. Then, the wing can be removed from the board and the bottom Front Spar and bottom center sheeting can be added.

More to come...

David
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Old 09-09-2008, 10:51 AM
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Default RE: Shark XV Build Thread

That's a pretty hot Xacto knife you used to cut them ribs out *grin* Looking good so far!

I forgot to tell you, a couple of weekends I went to a fun-fly up here and met tewitt, he had what looked like a SureShark (I forgot to ask him if it actually was).
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Old 09-09-2008, 10:51 AM
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Default RE: Shark XV Build Thread

Dave,

This is the thread I've been waiting for!!!!! The .15 size is very appealing to me, can pick up engines still pretty cheap and they are small enough to fly in most fields.

Consider me subscribed and waiting for the short kit!

Jeremiah
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Old 09-09-2008, 02:36 PM
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Rick W
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Default RE: Shark XV Build Thread



Outstanding.

Rick
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Old 09-09-2008, 03:00 PM
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Default RE: Shark XV Build Thread

Looks like it might be a fun size for a TD .09. Hmm. I've got a couple of those new in the box lying around here. What .15 are you planning on using?
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Old 09-09-2008, 03:34 PM
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Default RE: Shark XV Build Thread

Thanks everyone. I guess I'll use an FP .15. I also have a Super Tigre X.11 that might work.

I sheeted the center section, except for the area where the landing gear trunnions and the ply dihedral brace go.

I glued in the gear trunnion and the ply brace; next, I'll fill in the missing sheeting.

The gear is more for landing than taking off. I will still hand launch the model since my field is grass. It is bent from 1/16" wire to keep the weight down. The wing panel as seen in the third photo with the wire and wheel weighs 2.2ozs (60grms).

David
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Old 09-09-2008, 09:23 PM
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Default RE: Shark XV Build Thread

Hi RainDave, That looks real nice. That looks just like what I need. When you sell the kits let me know.

DT, yes, you did see a sure shark sitting at my bench. Terry
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Old 09-11-2008, 07:31 PM
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Default RE: Shark XV Build Thread

Have OS 15s will travel.
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Old 09-11-2008, 09:06 PM
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Default RE: Shark XV Build Thread

Thanks everyone. I've found one goof in the parts so far. I notched the center ribs for a 1/8" thick plywood dihedral brace. But, when I drew up the laser cut file I decided to put all the plywood pieces on one sheet of 3/16" ply to cut down on cost. So, the notches in the two inner ribs need to be 1/16" wider to accept the slightly thicker dihedral brace. No biggie. I also made a small design change by tapering the outer 2" of the ailerons. It looks better and it's supposed to be better aerodynamically, too (see photo).

The wing is done except for installing the aileron torque rods. I know, most people install them before gluing on the trailing edge stock. With symmetrical wings I find it a lot easier to get the TE stock in line with the center line of the airfoil (no up or down reflex) by gluing it on first. Then, I cut a trough in the TE to accept the torque rods and fill over it with balsa and epoxy. It's just as strong and doesn't take any more time than the traditional method. If you use two aileron servos then it makes no difference.

I will get crackin' on the fuse tomorrow.

David
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Old 09-12-2008, 05:10 PM
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Default RE: Shark XV Build Thread

Dave,

Can't wait to get a short kit, or two, once you're complete. I love my little Shark, but really want to see one just a bit bigger!

Frank
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Old 09-12-2008, 05:55 PM
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Default RE: Shark XV Build Thread

ORIGINAL: rainedave

I will get crackin' on the fuse tomorrow.

David
Hope that's only a pun!! Looking good so far.
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Old 09-12-2008, 10:54 PM
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rainedave
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Default RE: Shark XV Build Thread

I appreciate everyone's patience with this project. I got a bit burnt out with building earlier this summer, then my laser parts were slow getting delivered. This project should have been test flow in July, but things don't always work out. Dan is still willing to cut foam cores. I just need to get down to his shop.

Anyway, I obviously need to catch any errors with parts, make a few corrections on the plans, and get in some good test flights before offering anything.

Today was pretty pathetic. I basically bent the aileron torque rods. That's it.[]

David
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Old 09-12-2008, 11:13 PM
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Default RE: Shark XV Build Thread


RD, as you know this is how planes get done. You probably did more building today than 98% of the membership, just look at it that way.
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Old 09-13-2008, 04:21 PM
  #14  
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Default RE: Shark XV Build Thread

Dave, I have 3 of your 1/2 Suresharks and will be patient on this one, I'm in for 1 or 2 just keep us posted. If this one flys as well as the original it will be worth the wait!!! Pete
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Old 09-14-2008, 01:38 PM
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Default RE: Shark XV Build Thread

Thanks y'all!

The main fuse assembly went together in about 15 or 20 minutes.

I still need to add a few parts like the wing bolt plate and some tri-stock around the firewall. Then, it's on to the fuselage top.

The FP .15 with a round Dave Brown mount is a perfect fit.

David
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Old 09-14-2008, 06:05 PM
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brocja01
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Default RE: Shark XV Build Thread

Dave,

This is great work. Can't wait for this to come to short kit. I think a .15 will be a perfect size for me to get my feet wet again in glow. Been a couple years.

Keep up the good work and keep us informed when you have a short kit ready.

Jeremiah
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Old 09-15-2008, 04:36 PM
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rainedave
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Default RE: Shark XV Build Thread

I got the top pieces on last night and installed the wing bolt plate and the dowel in the wing's LE.

In the second two photos it weighs 190grms/6.6ozs. It's coming out lighter than I expected.

David
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Old 09-16-2008, 10:41 AM
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Default RE: Shark XV Build Thread

I did a weight check with everything, including the radio gear, switch harness, fuel tank, prop, wheels, etc., and it's 20.6ozs/585grms. I seriously doubt the covering will add 3 1/2ozs so I should come in under 24ozs less fuel or right at it. Performance should be fine. It has 240 sq." of area, so at 24ozs that's a 14.4oz wing loading.

David
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Old 09-16-2008, 12:01 PM
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Default RE: Shark XV Build Thread

I see fill 'blocks' ahead of the firewall on the tops of the fuse sides,
what is the story there... muffler clearance notch & fills?
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Old 09-22-2008, 09:42 AM
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Default RE: Shark XV Build Thread

RD - Looks good and your weight is right on! But ya gotta finish this one before you start a Super Pacer thread!

What are your plans for covering and finishing? Koverall & Dope or something else?

EG
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Old 09-22-2008, 10:20 AM
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Default RE: Shark XV Build Thread

Thanks EG. I have ordered the Solartex: translucent orange and blue. It is lighter than the opaque colors. I should have it in a day or two. I want to finish this thing fast and doping will take two weeks at the least (although I prefer that method).

Here's a shot of my scaled-up Wonder with translucent orange Solartex. The translucent blue goes with it nicely.

Also, a pic of the S-XV ready for the bottom sheeting and final sanding.

David
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Old 09-22-2008, 02:47 PM
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Default RE: Shark XV Build Thread

Youre killing me Dave. I already bought 4 new planes this year (youre sureshark was one of them) and have one left to build this winter.
I'll be watching closely though, I really like the SureShark and a larger version would be sweeet. I'd love to see the kit include all the wood, I had to go to 3 stores to get all the extra little wood items for the sure shark short kit. I'd gladly pay a little more for all the wood to be included.

I assume this will be a tailwheel landing gear configuration?

-Chris
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Old 09-23-2008, 09:29 AM
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Default RE: Shark XV Build Thread

Okay, Question. In post #6, in all three pictures, you show a plywood "thing" which appears to be a dihedral brace and also holds the hard wood block for the landing gear. But the plywood piece has a 'slot' in the center which slides over the center rib[s] as shown. Wouldn't the dihedral brace be stronger if it didn't have the 'slot'?? I'm trying to learn here, hence the question.
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Old 09-23-2008, 10:32 AM
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Default RE: Shark XV Build Thread

I LIKE the translucent orange. A lot. And hot orange planes, as well as the other cool fluorescent colors (lime green, yellow, aqua blue, etc) are very easy to see!

EG
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Old 09-23-2008, 11:17 AM
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Default RE: Shark XV Build Thread


ORIGINAL: Yuu

Okay, Question. In post #6, in all three pictures, you show a plywood "thing" which appears to be a dihedral brace and also holds the hard wood block for the landing gear. But the plywood piece has a 'slot' in the center which slides over the center rib[s] as shown. Wouldn't the dihedral brace be stronger if it didn't have the 'slot'?? I'm trying to learn here, hence the question.
Yes, it would be stronger without the slot. However, it is 3/16" aircraft ply and there is epoxy all around the joint where the slot fits around the center ribs. In addition, the center section will be wrapped with fiberglass cloth. On a plane this small and light (the wing is 3.7ozs) the wing joint is plenty strong. I have built .40 and .60 size models that use no dihedral braces at all (Super Kaos, UFO). The 1/2A SS does not have one, either.

This wing could be built without the brace to save a bit of weight and would still have all the strength it needs. The joint where the two wing halves mate together is probably the strongest part of the wing. I've never seen a wing separate at that joint if epoxied and wrapped with fg cloth. If it breaks, it will be out from the center section joint.

David
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