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Member postings for John Timmis

Here is a list of all the postings John Timmis has made in our forums. Click on a thread name to jump to the thread.

Thread: EDF Air Intake Area
06/10/2011 21:17:40
Hi all,
 
This is my first post so you will have to be patient.
 
I've been following this thread with interest because I've just built & flown ( only 3 flights so far) a Vampire. It's my first ducted fan so I'm no expert.
 
The model is a Vampire MK. 3. That's the single seat, short nose, round wing tip version.
It flies away from a bungee & seems to have plenty of thrust for a Vampire.
 
I built the model to be as scale as possible; the only deviation is a small increase in the size of the exhaust.
 
The inlet ducts are scale & are glass epoxy mouldings over foam patterns.

Main details are; Span 49", Weight 4 lbs, WeMoTec 480. 70mm fan, Battery 4s 3200, Motor 4000kv (I think), Power 670 watts from a fresh battery.
 
Inlet 3750 sq mm, FSA 3580 sq mm, Exhaust 2825 sq mm. The exhaust is enlarged from 45mm dia to 60 mm dia.
 
Hope this helps.
 
John T
 
 
06/10/2011 20:52:48
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