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Old Jan 08, 2002, 03:01 AM
It wasn't me...
DanSavage's Avatar
Trabuco Canyon, CA
Joined Nov 2000
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F-106 Delta Dart...

I, too am finished cutting parts and have begun construction on the "Six-shooter".

I've always had a soft spot in my heart for tail-less delta winged aircraft, and in particular those from Convair. IMO, the F-106 Delta Dart and the B-58 Hustler are among the coolest looking aircraft to ever grace the skies.

But, in spite of this, I've never built a model of either of these. Until now.

My model is all built-up construction using balsa and lite ply. I've simplified the construction so that it will be quick and easy to build, yet light and durable. It's designed to accept the MF480, but could be modified to fly with a Kyosho fan unit.

The model's basic specifications are as follows:

Length: 49-1/2"
Wingspan: 28"
Wing Area: 390 sq. in.
Est. Weight: 2 Lb.s
Est. Wing Loading: 12 oz./sq. ft.
Power package: WeMoTec MF480/Kyosho AP-29L hybrid
No. of Batteries: 7-8 CP-1300/1700 (depending on current draw)
No. of radio channels: 3 (elevons/throttle)

<center><a href="http://SavageLight.com/Dart/wing.htm" target="_new"><img src="http://SavageLight.com/Dart/centenial_1.jpg" width="607" height="155"></a></center>

Click on the F-106 pic above to see how the wings are built.

Now that the wings are completed, it's time to move on to the fuselage construction.

Dan
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Old Jan 08, 2002, 03:23 AM
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GregG's Avatar
Antioch,CA,USA
Joined Dec 1999
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Very nice choice of subjects, Dan. Your work is very impressive as well, I wish I had that much get up and go! The Dart you're doing has the same WS as the slimer Mirage I'm converting, but you have over twice the wing area! I giess that's one of the pluses of scratch building.
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Old Jan 08, 2002, 04:02 AM
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australia but from missouri
Joined Jan 2002
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any plans in the near future ?

Are yuo thinking of making up any plans as its a very nice plane would be very interested in them if you are thinking about it
keep up the good work cant wait to see it finished
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Old Jan 08, 2002, 09:45 AM
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Hi Dan

The 106 as one of my favourites too, and yours looks great!

Where can I get 3-views of the 106? All I seem to be able to find is the 102, which is nowhere near as cool looking.

Cheers

Gordon
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Old Jan 08, 2002, 10:36 AM
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Dan, that looks terriffic!

I bet you are not looking forward to cutting out or masking all those stars though. When I did my Skyray there were not THAT many, and I still cheated by printing stars on a dark blue background so I could cut them out like little pentagons. Much quicker!

Keep the pictures coming, please!

Max.
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Old Jan 08, 2002, 11:34 AM
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Dan, I had a closer look at your drawing, and although I am not sure I am reading it correctly it seems to me that you are building in a bottleneck at the crux of the Y shape (is that the right word? I mean the place where the two ducts meet).

My approach on both Skyray and Skyhawk was to keep the total intake area the same as the total fan area, increase slightly in cross-sectional area up to the crux(?) and then taper down to the fan dia.
I attach an image of the construction of my Skyhawk (RBC kits). The fan will be positioned on this side of the last former you see.
The duct wall can be formed as a squashed cone from a single sheet of paper.
Hope this is of any use to you, although I fear you have worked everything out by now, and do not want to redesign things until proven incorrect (I probably would'nt!).

Good luck,
Max.
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Old Jan 08, 2002, 05:04 PM
It wasn't me...
DanSavage's Avatar
Trabuco Canyon, CA
Joined Nov 2000
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F-106 Delta Dart...

All:
Thanks for the kind words of encouragement.

GregG:
Thanks for the kind words.

jeffhines:
If and when the rules are ever finalized, I'd planned to submit this into the EDF design contest, so I suppose that plans will eventually become available.

Gordon:
I can't remember where I got my 3-view from and I don't have access to it right now, but will later today. If you'd like I can email it to you.

max z:
Actually, I won't be cutting the stars out by hand. I'm too lazy for that. Instead, I'm gonna cheat. I'll use Adobe Illustrator to draw one star, then define 4 areas (top, right and left sides and bottom) and rotate and scale the star to make up the star fields. Then I'll use a Stika vinyl cutter to cut the stars out of white vinyl and stick the four panels of stars down one at a time. The same goes for the fuselage spine stars and the stars and lettering on the rudder.

Bifuricated. (I knew what you meant). The inlets are a little larger that the required FSA to make up for duct losses.

Thanks for the suggestion and the pic. You're right. The Six-shooter's inlet is very similar to what's seen in the pic. The biggest difference is that it'll morph from a square-ish inlet to a round fan. I'm planning to use some heavy card stock like posterboard for the outer portion of the inlet ducting material. It's smooth, stiff, relatively light and easy to work with. The inboard section will be constructed very similarly to what's seen in the pic you posted.

The original design called for having the duct openings in the two bulkheads seen in my pics being the same size, but after looking at the pic you posted, I think I'll open the forward one up a bit to create a slight cone between the point where the inlets join and where the ducting meets up with the fan. It'll be a little more efficient.

I'm also planning to carry the splitter plate all the way to the fan. I've read that this is a little more efficient.

I'll post more pics and updates as I make progress. This model is designed to go together pretty quickly.

Dan
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Old Jan 08, 2002, 05:40 PM
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Plane Crazy's Avatar
Reno, Nevada
Joined Jan 2001
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NEAT!! Can't wait to see some picts....

I was wondering about splitter plates in front of the fan. Can you introduce a splitter plate that starts somewhere in the the duct but does not go full length of the duct? Or does this disrupt the air flow too much?

Gordon
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Old Jan 08, 2002, 05:45 PM
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Irvine, Calif USA
Joined Feb 1999
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Very nice! You might want to consider a (or two) cheater holes on the bottom, so you can keep the intakes close to scale. In spite of what is often being said, I don't think it will detract much from performance as long as it's up front close to the intake & away from the fan & will allow the fan to get plenty of air.
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Old Jan 08, 2002, 06:29 PM
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Trabuco Canyon, CA
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Quote:
Originally posted by Plane Crazy
I was wondering about splitter plates in front of the fan. Can you introduce a splitter plate that starts somewhere in the the duct but does not go full length of the duct? Or does this disrupt the air flow too much?
I don't think you'd see too much benefit from a splitter plate by itself. My understanding is that the splitter plate is supposed to keep the air coming in from a bifuricated inlet from mixing together prior to reaching the fan.

It's my understanding that this mixing reduces efficiency because it causes turbulence in the airstream.

Dan
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Old Jan 08, 2002, 07:18 PM
It wasn't me...
DanSavage's Avatar
Trabuco Canyon, CA
Joined Nov 2000
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Quote:
Originally posted by Herb
Very nice! You might want to consider a (or two) cheater holes on the bottom, so you can keep the intakes close to scale. In spite of what is often being said, I don't think it will detract much from performance as long as it's up front close to the intake & away from the fan & will allow the fan to get plenty of air.
Thanks!

I'll keep that in mind. Other than squaring the inlets to keep the model simple to build, they should have a reasonably scale profile. One of the side benefits to going to a square-ish outline was that the inlet area increased slightly. I also increased them just a bit to let the fan breath a little more freely.

Dan
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Old Jan 08, 2002, 10:42 PM
It wasn't me...
DanSavage's Avatar
Trabuco Canyon, CA
Joined Nov 2000
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Quote:
Originally posted by Gordon
Where can I get 3-views of the 106? All I seem to be able to find is the 102, which is nowhere near as cool looking.
Hi Gordon,

I wasn't able to find where I'd downloaded the F-106 3-view, but I did put it online. Click <a href="http://members.home.net/marsavage/dart/delta_dart.gif" target="_new">here</a> to download it.

Dan
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Old Jan 09, 2002, 02:57 AM
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Hi Dan

Thanks for the 3-view which is now archived (along with those super colours shots!)

Ref the splitter plate, I am assuming that what will happen is the inner duct walls will eventually meet at a vertical knife edge just in front of the fan. This is the way most modern GDFs are arranged, so must be the right way.

Additionally, wth this type of ducting I always thought it would help to reduce rapid changes in duct x-section by inserting a cylinder, the same dia as the rotor hub, ahead of the rotor (omit the spinner), concentric with the rotor axis, and blending into the inner duct walls.

In a GDF, this cylinder forms the duct for the starter wand, but I'm sure it helps to keep the airflow ahead of the rotor nice and axial as well, as it doesn't have to spread round the spinner. I have used this idea in a couple of .90-size scratch-built GDFs (Mirage 2000, Hawk), and intend to carry on using it with future EDFs as I feel it does improve duct aerodynamics (though I can't see any use for it on my current MiG 15 project )

Cheers

Gordon
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Old Jan 09, 2002, 03:08 AM
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Antioch,CA,USA
Joined Dec 1999
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Re: F-106 Delta Dart...

Quote:
Originally posted by DanSavage
All:
Thanks for the kind words of encouragement.

I'm also planning to carry the splitter plate all the way to the fan. I've read that this is a little more efficient.

Dan
I did some tests on a small fan some time ago. These involved testing the trust and ampdraw of the fan while running and then moving a splitter plate into place just in front of the fan face.

The ampdraw went down slightly and the thrust improved with the splitter plate installed. There was also a noticable RPM increase by the sound it was making.
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Old Jan 09, 2002, 11:23 AM
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Dan, here is another picture to show you how I did it. I tried to keep the point of the "pie section" as sharp as possible. The former in the middle actually had to be modified to curve inwards slightly, to avoid having a bulge in the plywood wall. You would not think so at first, but if you warp a sheet of stiff paper and look across it it becomes obvious.

Regards,
Max
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