Well, Griff, got to say what a great plane. This flies wonderfully. I think the cg may need to be closer to 4", but it only took half a second to trim her out. She just flew awesome. This is my first EDF, so if anyone's looking for a good introduction this is it! Very quick and agile but would slow down and just float in for a landing. I did notice she liked a little speed through the turns. A couple times I was a little slow and she wanted to drop a wing, but it was easily recoverable. Well done! Can't wait to put her in the air again. Got two packs in and would have gone for more except you can see my edf was starting to come out of the thrust tube. A little glue and good again for today if the weather cooperates. Well done!
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Grifflyer - I don't have an EDF experience but this one sounds like a great trainer. Question for your - I'm trying to stay consistent to fly everything off of 3S 2200 or 3S 1300mah batteries. The EDF you link to in the first post has a 3S option - any feedback on it?
Well I have no feedback on the 3s version so I can't give you any suggestions, but I 'll try and fly my Grunjet with a 3s battery on a 4s fan (lower kv) and give you feedback, because if the 4s fan can fly on 3s I'm sure a 3s fan with a 3s battery will do just fine. do you see what I'm saying lots of S's
Thanks man. What flight times are you getting on the 3s? Unfortunately banggood is “under restocking”.
Finally going to build this. HK order took 2.5 weeks to finally ship but will be here early next week. Any building tips not in the thread yet?
Grifflyer do you have a weight on yours without the battery? I realized the EDF I picked up was the one used by Aircninsei on his Eazy build. It only has 450g thrust on a 3s which is all I have. Not sure if it will be enough depending on the weight of the Grunjet?
Introducing the Grunjet, a two sheet foamboard performance jet flying fast and sporty, and slows down to a solid run on landings, and is packed with amazing vertical performance, all only costing 80$ built to BNF standards
-Video
-Parts list
two sheets of adams readi-board
FMS 50mm 11 blade EDF 4s version
4s 1300mah 45C
40a esc
three 9g servos
-Review
-Speed
I would say roughly 70mph
-Handling
smooth but fast roll rate with the same tendencies on the elevator which makes a great introduction to jets
-Slow speed
This is one of the strongest points for the design, so it comes in really slow compared to other jets in its class.
-Stalls
A little rough but I have yet to drop a wing
-Aerobatics
This plane doesn't have a rudder so you're limited to basics: rolls, loops, and inverted flight.
-Take offs
You can either do an underhand launch while holding the thrust tube, or my favorite, just plop it on the grass and give it full throttle and off she goes!
-Vertical
Nearly unlimited
-CG
4.5 to 5 in/11.5 to 12.5 cm from leading edge
-Gallery
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-Plans
Grunjet Plans V1.0
-Decals
Grunjet Decals