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Old May 20, 2004, 07:54 AM
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United Kingdom, England, Surrey
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Phantom II for twin mf480 or single midi

Hi,

I've been drawing up from cad plans for a wooden Phantom. It is currently sized for twin minifans, which makes for very simple ducting. However i'm beginning to think that a single midi fan would be a better choice.

How do 2 400watt minifan setups compare to a single 800watt midi setup? I'm guessing the minifans will require more power (heavier batteries) and produce less thrust than the midi. The ducts would be much harder though.

With 4s2p irate 1800 a single 400watt minifan setup weighs in at about 400g and produces 700-800g thrust.

A midi would probably come in at 700g with 5s2p irate 2600s. This would be good for 900watts, how much thrust do you get from 900watts from a midi?

Joe

p.s. will show pics of the cad model later.
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Old May 20, 2004, 03:22 PM
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New Hampshire, USA
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I'd vote for the Midi I've been converting .mdl files with that program from your other post for days! I have yet to find a decent F-4 though...
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Old May 20, 2004, 04:25 PM
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If we go with a midifan I think the model will need a molded exhaust duct. The jet nozzels are too low to use a KC f18 style exhaust without introducing downthrust. Any help would be great on this.

Here is a pic of the model as it stands, surfaces are finished, may add some fairing towards the rear and need to chop the intakes to the correct angles. Then I need to split out the formers and feed them into the cnc machine. As usual i'll share the model here when finished so others can experiment with it.

Model is 1190x810mm sized for 100% fsa intakes of 2xmf480 or 1x90mm fan.

Joe
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Old May 20, 2004, 05:12 PM
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Lewisville, Texas, United States
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F-4

Great minds must think alike

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Old May 21, 2004, 02:18 AM
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NorCal Silicon Valley
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thats a tough call! With Midi you could poor gobs of power into it, but then you get cost and complexity of pants style exhaust. Also this is one of the few planes where twin mini's wont hurt your space requirements for gear. All I know is I would buy it either way! LOL It's actually a great plane for CG either way also, with Midi you have tons of room for packs on the sides, with mf480 tons down the middle. OK, OK, I'll take both!

Barry
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Old May 21, 2004, 05:39 AM
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[QUOTE=EAMRC]Great minds must think alike
[QUOTE]

The plug looks fantastic. What are you going to power it with?

I've finished the cad model, here are some pics.
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Old May 21, 2004, 05:40 AM
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last one
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Old May 21, 2004, 09:03 AM
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Twin Mini, single Midi, Toki, RK-720, Shubi, Wren MW-44 or Nano Bee, taping the panel lines and detailing the belly pan this weekend hopefully go to mold in the next two weeks. The big decision is wheather mold it with or without the verticle. You do great cad work !!
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Old May 21, 2004, 10:23 AM
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Gaithersburg MD, United States
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Beautiful job Joe. Very nice renderings.

You guys are really wetting my appetite. The "rhino" is one of my favorite jets. A twin MF480 F4 may just be in my future .

Paul
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Old May 21, 2004, 11:25 AM
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That Mini Twin F-4 sure looks great to me, but I think the single Midi would be cheaper to equip and fly. How much loss of power could you expect from the "pants" type of exhaust tubing?

I Agree with Barry, I'll Take Both!!
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Old May 21, 2004, 12:39 PM
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Beautiful CAD model! EAM, that plug looks great too...
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Old May 21, 2004, 12:45 PM
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I'm in.
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Old May 21, 2004, 04:26 PM
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The Netherlands, DR, Emmen
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Joe,

Looking good indeed, isn't the double mini-fan setup easyer to duct than the midi-fan setup ?? I would go for the double mini on this one.

success,

Appie
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Old May 21, 2004, 07:04 PM
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Wareham, Dorset, UK
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Quote:
Originally Posted by RickG
I'd vote for the Midi I've been converting .mdl files with that program from your other post for days! I have yet to find a decent F-4 though...
Rick,

hey, I thought you wanted to buy two of my new EDFs?

That's just the thing I've been waiting for.

The first who builds this F4 will get two of my new WM600 free of charge!
I always thought that the F4 is a very good model for EDF.
Dimensions of the WM600 can be found here in the forum under:

http://www.rcgroups.com/forums/showt...58#post2190558

Have fun with fans

Klaus
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Old May 21, 2004, 07:17 PM
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WM600 Fan

Do you have a drawing with the dimensions ? how will it mount ?
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