What about a Twin EDF FT Cruiser ?

by nickatredbox | April 20, 2013 | (11) Posted in Just Fun

Got 2 Dr Mad EDF's Coming 20% More Thust

Dr. Mad Thrust 50mm 10 Blade Alloy EDF 3300kv

Input Voltage: 4S 14.8V lipoly
Rotor Diameter: 50mm 10 Blade
Outer Diameter: 53mm
Weight: 93g with 2mm bullet connectors
Motor: 20-40 Brushless Inrunner 3300kv
Max Amps: 27A
Max Thrust: 650g

Twin Jet Cruzer Speed Build

Jets tape into the nacelles

What about a Twin Jet Cruiser

Love Josh's design hope he doesn't mind if I mess with it a little ? My apologies in advance for using Napoleon units on the drawing :)

Under slunk nacelles would be simpler to engineer I think

Testing 2 X Hobbyking 50mm Alloy EDF V2 4200kv Thrust 850 grams @ 36 Amps

Blended Canberra nacelles look great but make the wing a bit complex

May be blend the nacelles into the wings like a Canbera so they are not under slung as above. The spar would have to be revised as the EDF cuts through it, the nacelle could be made structural to compensate for the 2 peice spar

Perhaps this would work? looks like the HK Alloy 50mm fits in the wing nicely. May be the aeleron should extend into the air flow from the EDF? or would this give them way to much autority?

The power requirements are similar go for a 2.2Ah 4S Nano Tech is a great battery very little voltage sag under load. Should give 1.1 Kgs(2.4 Lbs) static thrust, should be better than 1:1 mass / thrust ratio.

In my experiance with jets it should go like scalded cat.

This might work a couple of carbon spars in the airflow crossing each end of the EDF

Does anyone have an idea regarding thrust angle?

This video shows some interesting charecteristics with thrust tubes

Power Options

Hobbyking 50mm Alloy EDF V2 4200kv (4s Version)

Ran these on the thrust rig at the week end they are very well balanced and on the 4S Nano Tech 2200 mAh they push alsmost 600grams a peice

Hobbyking 50mm Alloy EDF V2 4200kv (4s Version)

The Hobbyking Alloy EDF series are pre-assembled and dynamically balanced making them simple and easy to fit, no unit assembly is required. As well as high power, these fans have excellent cooling and run so smoothly, the sound is amazing, there is also no housing distortion unlike plastic fans. This nice quality, powerful fan is a great way to upgrade your foamy 50mm jet to a missile in around an hour!

Features:
Pre-assembled
Factory dynamically balanced
High power with superior cooling
High quality construction
Fully servicable
Fast to fit
No housing distortion

Specs:
Rotor Diameter: 50mm 5 Blade
Outer Diameter: 54.5mm
Weight: 85g with 2mm Connectors
Motor: 20-40 Brushless Inrunner 4200kv
Max Amps: 22A

EDF64 with ADH300 Motor Assembled 252W

This unit has the ADH300 motor, producing more power, yet drawing more current.
If your plane can take a larger battery (2200mAh+) then the ADH300 motor would be a suitable option.

Spec.
Test Voltage: 11.1~14.5v (3-4S)
Test Current: 16A
Thrust: 540g
Power: 252W
Motor: ADH300L

Turnigy nano-tech 2200mah 4S 25~50C Lipo Pack

Spec.
Capacity:2200mAh
Voltage: 4S1P / 4 Cell / 14.8V
Discharge: 25C Constant / 50C Burst
Weight: 239g (including wire, plug & case)
Dimensions: 119x35x32mm
Balance Plug: JST-XH
Discharge Plug: XT60

HobbyKing 30A BlueSeries Brushless Speed Controller

Spec.

Cont. Current: 30A
Burst Current: 40A
Battery: 2-4 Cell Lipo / 5-12 Cell Ni-XX
SBEC: 5V/ 3A Output
Size: 23*43*6mm
Weight: 28g

COMMENTS

teamleader on April 20, 2013

what a great idea having the EDF's in the wing, would look good
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nickatredbox on April 21, 2013

Thanks perhaps FT will do a version

I have a the twin cruiser twin pack on order, looking at the design I think its simpler to have under slung nacelles
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oneiwily on April 20, 2013

you will need to reinforce the wing,
regarding the angle , I'd start with 0 but I would place the aileron on the engine exhaust, that way you will have improved aileron behavior.
since each aileron is connectend to diff servo you can trim each separately.
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nickatredbox on April 20, 2013

Thanks for the input, I suspect the Ailerons will be nice and precise if they are in the fast air of the jet.

Do you have any thoughts on fitting thrust tubes inside the nacelles, I saw a post where the guy used paper cups reinforced with packing tape

I have a second EDF unit in the post from HK now
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oneiwily on April 21, 2013

I had some thin plastic sheet. created a cone out of it, nothing more then that.
you can reinforce it with some foam if you like., just cut some to size and fit it in.
note that the shorter the exhaust tube is the more thrust you gain.

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Is it a cone of a straight tube?
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This is a pretty interesting video on thrust tubes
http://www.youtube.com/watch?feature=player_detailpage&v=qLuydmx9xWs
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note that when there is none or same diameter as the EDF, you get the best results. on real jet you need the thrust tube to linear the thrust , on EDF you don't,

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Thats what I'm hearing http this bench test ://www.youtube.com/watch?feature=player_detailpage&v=qLuydmx9xWs pretty much proves the point.

Thinking about it unlike a real turbine there is no real pressure with an EDF just flow, in the video you can hear the note change with only a few mm of diameter reduction.

Mich be able to find a plastic bottle with the correct diameter for the nacelles which is purely cosmetic.
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sailorJohn on April 21, 2013

That would be as neat as a rocket plane
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billsbigf8 on April 22, 2013

so your the guy that has inlunced my son to want everything to be rocket powererd. lol !just kidding but i love this edf version
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Royalstar05 on April 22, 2013

I would love to see how Josh would design the pods for the edf's he is the man
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awesomerc23 on April 23, 2013

i think that 50 mm would be to small i personally would go with a 64 mm or 70mm ducted fans
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nickatredbox on April 24, 2013

I have a couple of 64's in the post just in case. That said the Alloy jets actually out perform the 64's but are less efficient

EDF64 with ADH300 Motor Assembled 252W(4300kv)

http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=6632&aff=652823

Test Voltage: 11.1~14.5v (3-4S)
Test Current: 16A
Thrust: 540g
Power: 252W
Motor: ADH300L

Hobbyking 50mm Alloy EDF V2 4200kv (4s Version)

http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=22946&aff=652823

Rotor Diameter: 50mm 5 Blade
Outer Diameter: 54.5mm
Weight: 85g with 2mm Connectors
Motor: 20-40 Brushless Inrunner 4200kv
Max Amps: 22A
Max Thrust: 550g

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cragun1022 on April 28, 2013

This blew my mind it is so cool.
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nickatredbox on April 28, 2013

Perhaps Josh will build some pods with the correct thrust angles
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Heyitsmejohnmc on June 29, 2016

I love edf conversions . I can't tel if you actually made an edf version of this plane or if it's a photo shop hypothetical article . A real version of a twin edf would be impressive
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What about a Twin EDF FT Cruiser ?

Got 2 Dr Mad EDF's Coming 20% More Thust

Dr. Mad Thrust 50mm 10 Blade Alloy EDF 3300kv

Twin Jet Cruzer Speed Build

What about a Twin Jet Cruiser