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Old Jan 21, 2015, 06:44 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,689 Posts
Dan,

The F106 used an NACA0004-65_modified both root and tip.
The modified means it was probably stretched to fit the chord needed and the thickness would stay as designed. Easy to do in Sketchup as you know if you have the coordinates from a DAT file.
Wish I could have gotten to the 106 by now but the day job is still backed up with little sign of meaningful time off. It will get built this year and hopefully started this spring.

Cheers,
Eric B.
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Old Jan 21, 2015, 11:40 PM
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buildcrashrepair's Avatar
United States, KS
Joined Jul 2013
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I would love to see several of these built and then get all of them at an event somewhere! I think that would be awesome!

Any ideas on an estimated AUW?

I'm thinking around 15lbs but I could be way wrong as I don't have any experience with large scale edf's (this will be my first 90mm).

D_FAST if you have specs for the internal formers I can do something up in inventor to show you what I was talking about with sliding mechanism for detaching the nose cone if you want.
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Old Jan 22, 2015, 12:44 AM
Registered User
United States, CA, Stockton
Joined Apr 2012
2 Posts
Hi Rob
Just being able to build an interceptor such as this be it 70mm or 90mm would be a pleasure.


D-Fast Hi
Just a thought what if you split the plane just forward of the fan and placing a plywood ,bulkhead on either side of the fuselage with an access hatch on top to fasten the two half together and with removable wings should be easy to transport, "my .02" I've seen this on other large models. But what ever you come up with will be perfect.
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Old Jan 22, 2015, 08:18 AM
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Denver CO
Joined Apr 2008
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15lb is way to heavy. This bird has to be built light.

Remember there is only 775 sqin of wing area using the Scale wing plan.

I try to never build anything with Wing Loading over 21oz/sqft.

I know they fly heavier, but they fly better with lighter wing loading

Here is some math.

5lb = 80oz | WL = 14.86 (oz / sq ft)
5.5lb = 88oz | WL = 16.35 (oz / sq ft)
6lb = 96oz | WL = 17.84 (oz / sq ft)
6.5lb = 104oz | WL = 19.32 (oz / sq ft)
7lb = 112oz | WL = 20.81 (oz / sq ft)
7.5lb = 120oz | /WL = 22.30 (oz / sq ft)

Dont think the ship has much room for larger setups.

My thinking was 6s/5-7blade setups to keep lipo size/C rating/amperage all down to a min. to keep it light.

My 64mm flew great @ 790+g , but was a tank, as the wing loading went above 19 oz/sqft.
Easily hand launched, but wanted to land really hot
If you watch these landings you'll noticed the sink rate is up there.

http://youtu.be/YQQZ0-zBVxI?t=2m

now that i look at it again i floated the last 3 ft in,
but thats clearly landing skilz with delta's
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Old Jan 22, 2015, 09:03 AM
Do it Right, the first time!
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United States, MN, Hermantown
Joined Dec 2008
6,142 Posts
Dan , you would be thoroughly upset with my Scorpion and F-18 builds then...

Both run in the mid 30's for wing loading, and approx 12 lb. But then again, a JF 90 on 12s, full retracts with struts, and 10 servos does add up!

BTW--wing area for the F-18 is 795.72 sq/in or 5.52 sq/ft.
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Old Jan 22, 2015, 12:11 PM
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buildcrashrepair's Avatar
United States, KS
Joined Jul 2013
266 Posts
Quote:
Originally Posted by CoolerByTheLake View Post
Dan , you would be thoroughly upset with my Scorpion and F-18 builds then...

Both run in the mid 30's for wing loading, and approx 12 lb. But then again, a JF 90 on 12s, full retracts with struts, and 10 servos does add up!

BTW--wing area for the F-18 is 795.72 sq/in or 5.52 sq/ft.
Good lord im surprised they even fly How many watts are you pulling???

Just ordered a CS 90mm 12b fan today so im getting ready. Also stocking up on fiberglass .5 oz cloth
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Old Jan 22, 2015, 02:25 PM
Do it Right, the first time!
CoolerByTheLake's Avatar
United States, MN, Hermantown
Joined Dec 2008
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Quote:
Originally Posted by buildcrashrepair View Post
Good lord im surprised they even fly How many watts are you pulling???

I don't know why you would be surprised, lots of planes out there that are in the weight range with even lesser power. I haven't installed fans yet--slow builder--
but they should have between 4200-4400/w.

Even C/N's JHH F- 86 weighs in at about 12.5 lbs, and it is fast!!

Even at 4200W and 12lbs, that's still 350w'lb , Rainers bench test on these
showed 11.22 lb thrust, installed on the F-18. and because it will have a bifurcated exhaust, I'm hoping for 10lbs -- or so.

Another guy who built same plane, and only using a Wemo 90 on 8s, got about 9 lbs.thrust. But he did not have the same style of ducting I'm doing--I changed the intake to be classic "C" variant style-- lots more work involved in that.
His was lighter, only because it was a belly lander-
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Old Jan 24, 2015, 12:56 AM
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United States, KS
Joined Jul 2013
266 Posts
Just want to get your guys opinions about this idea.

Do you think it would be plausible to get the airbrake in the back to work? I'm think a small 6 or so gram servo would work possibly.

I really want to go all out on this build so scale details are a must (or at least the larger ones)

Rob
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Old Jan 24, 2015, 04:17 PM
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United States, NJ, Frenchtown
Joined Mar 2003
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Almost everything I now build has all servo wire shafts converted to pull - pull with no stretch braided 10# fish lines. That allows all the servos to go way forward of the COG. Then the battery comes closer to the COG

My Free Wing A-10 actually has the battery right at the COG . true it has a tractor prop driven by a geared about 400 sized motor . It took a long time to keep moving & taping parts to get it right.
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Old Jan 26, 2015, 12:18 PM
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buildcrashrepair's Avatar
United States, KS
Joined Jul 2013
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D_FAST, do you think that a 2 6s 5000 mah running in parallel to 12s will fit in this fuse? Im thinking of a 12s 90mm 4 killowatt power system, but not quite sure it'll fit.

In case you haven't guessed it already im trying to reach 160 mph or around there
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Old Jan 27, 2015, 07:48 PM
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Denver CO
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the battery compartment will accommodate those
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Old Jan 28, 2015, 06:57 PM
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buildcrashrepair's Avatar
United States, KS
Joined Jul 2013
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Any updates on progress D?
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