solentlife
I have 50 ... 64 and 70mm EDF models and find the 50mm to be very good ... 64 good all rounder ... 70mm - not a great admirer of to be honest.

The Vulcan build has made me think about EDF for a possible successor ... 

I know Quorneng has a lot of experience with the smaller EDF's such as 30mm ... and bigger.

So My question would be :

What could i expect from a set of 4x 30mm ... 35mm or 40mm EDF's ... with the main emphasis on the 30mm .. 

I would of course steer clear of the AEO EDF's which too often report shedding of rotors and lack of thrust. 

I used twin 50mm in my Concorde - but the motor pods are huge compared to the size of model suited to such power. Plus I had to overpower with 4S ... 

??
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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quorneng
Solentlife
I am sure you know my response - build light and avoid the need to 'over power' the EDFs!
I have a 30 mm EDF a scratch built EE Canberra and it flies well on a 950 mAh 2s! With throttle management you can eek out flights of nearly 5 minutes.
In this case 30 mm fans were chosen simply because the Canberra Avon's are a very small diameter for their length and being wing mounted in nacelles meant there was no opportunity to install an over size fan and retain a scale appearance.
Complete4.jpg 
As a result the Canberra is quite big, 32" (810 mm ) span for the size of its fans particularly as they are AEO units!
The AEO fans use out runners which at this size are nearly twice the diameter of the fan hub!
AfterBody.jpg      
 If you subtract the motor area from FSA and then reduce the thrust tube down to the 'normal 85% area you end up with a nozzle that is just 22 mm diameter ðŸ˜² although this is not far from scale for the Avon but it looks ever so small!

Light weight is king for small EDFs!  
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quorneng
I forgot. Ready to go it weighs just a fraction under 8 oz (225 g).
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solentlife
Having watched a number of your builds Q - you are a master of building light. 

I have been searching out trying to see what alternatives there are to AEO units and found this :

https://www.ebay.co.uk/p/30mm-6-Blades-Ducted-Fan-EDF-Unit-With-Qf1611-7000kv-Brushless-Motor/854011543?_trksid=p2047675.l2644

I cannot really believe it hits 220gr thrust ...
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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quorneng
The data looks a bit odd.
2s LiPo is recommended in the specification but the thrust table is based on a 3s. 
I did test a 40 mm AEO on 3s and it produced close to that sort of thrust but it was the motor, not the fan, that gave up in under a minute.
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solentlife
That was my understanding as well looking at the specs ... 
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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