Modular F-104 70mm EDF Jet development and testing

[L Edge]

I'll have to try that, be interesting to get exact numbers on how much it improves. I'm thinking of starting a thread with performance for all the EDFs I own as a resource for other designers and maybe soliciting contributions, so that could be something to add in there too. Do you think it will be able to give an extra 20% or is it smaller, more like 5-10%?

Not having any real way to accurate measure it, I would guess it is a small value and if you look at the whole picture, it depends upon the inlet ducting, edf, and exit ducting (including the exit shape). My experiments with EDF's was more of getting the plane to fly rather than speed.
As I mentioned before, single engine EDF problems are different than duals. I was a speed freak back in my younger days.

 

[telnar1236]

I've finally given up on the Powerfun EDF and am now upgrading to a 6s power system. Gave it one more try and this time it failed in a third way and threw molten metal from the solder joints over the inside of the airframe. So I'm going to the 70mm Xfly fan on a 6s 3300 mAh pack. The fan is 70g heavier and the pack is 100g heavier, so the total weight will increase by 170g or 8.5%. However, the thrust will increase by at least 300g (16.7%) so the performance which was already pretty good should be exceptional. And I think the 170g weight increase and whatever the increase in speed will end up being should be within the capabilities of the airframe.
Changing the power system is also very simple since the EDF mount/housing is separate from the rest of the airframe so there are only two parts that need to be replaced (the split halves of the housing). The only real challenge is that the motor can is a bit longer and the mounts are a bit different, but there is still plenty of space.

I've also beefed up the EDF housing a bit to help it deal with the increased thrust and EDF unit weight just in case.