He is back. With all these (semi) professional builds lately I feel kind of ashamed to continue this thread 
Anyway, I have upgraded to passive water cooling which worked really well. I had to adapt the mast clamp (front only) and drill another hole in the mast side.
Due to the loss of the pump I could tidy up my interior a little bit with a self print box. Also I moved to maytech remote (epoxy treatment). I like the feature to turn on the led by relais
Furthermore, I have add the gong foil curve MT to my collection. I really have to test a lot for the next time, especially the flite prop (adapted already)caught my interest
Hi, where do you drill the mast ?
Thanks , have you the stl file ?
I think you can access the file already
Did you put any kind of gasket between clamp and mast so that cooling water goes into mast or that isn’t necessary?
I have silicon around the clamp. The mast itself fills with water and acts as tube. You need to seal the mast cavity properly at bottom and top to avoid the loss of pressure
Gong has these rubber like inlets, I used the for bottom position. For top i printed like a little fixture with holes for the wire. Then I sealed it with silicone
No metr logging experiments, no wing or prop switch, no concerns about water intake or cooling; just fun
Who ever is interested, I have a couple of logs to share.
First: I did a run on my 100kv setup, 12S and Gong Curve MT wing. I did test the FR 6", modified flite 7" and a new prototype 7" (CNC alumina) from an EU based startup. I wanted to compare the props in one session to test the general “feeling” directly and to have similar weather and water conditions. The drawback is ofc the slight drop of voltage. Anyway, I did just a few minute rides, 25kmh, 30kmh and topspeed in both directions. For topspeed I did only compare the flite to the prototype due to the fact that they have some pitch.
FR 6"
Pros: running very smooth, punchy
Cons: limited speed on this setup
Flite 7"
Pros: good top speed, punchy
Cons: amp hungry, vibration
Prototype 7"
Pros: good speed, running smooth, punchy
Cons: wings are opposite direction and I forgot to invert the motor direction 
For the performance have a look in the metr. The flite is definitely more vibrating. I do not think it’s due to the modification, it has been done by a milling professional (not bybme )
And second the final show off, FR 7" (progressive Pitch) vs the new prototype 7". Same procedure, two times test run for both directions with 25, 30km/h and top speed. From feeling both behave equally; FR maybe even more balanced due to the fact that the prototype one is not balanced to keep the cost down in development phase.
FR 7"
Prototype 7"
(Forgot to switch off my log…topspeed is from car )
Thanks for sharing, nice data. I’m flying a modified flite prop as well, what did you modifiy? I still need to compare an original flite prop to the one I use with rounded blade tips.
I just had the motor assembly modified to fit for 65xxx motor. Blade shape is same as original one
Do you see any advantage with the rounded blades? My feeling is that flite is optimises for ducted use, so I think you are on to something.
Great logs btw.
It’s a difficult topic; from some documentary I saw that the tips/wings reduce pressure fluctuations. But what do I know
Well the org flite is using torqeedo design and thats optimised for duct with less blade area close to duct. Good work, perhaps i will copy.
