Monte.C
...
What's the biggest FT motor?What are you gonna run it off of? A c-pack motor?
Double that. This is gonna be super fast.
It's That Time Of Year Again: Snow Skimmer Shenanigans!
- Thread starter Ryan O.
- Start date
Double that. This is gonna be super fast.
Crawford Bros. Aeroplanes
Legendary member
Ryan O.
Out of Foam Board!
I finished fusion360 model for the duct for the middle motor. It's basically the same as a BDF, just a different length and taper angle meant to allow it to go over jumps. I don't know whether or not to give it an oversized intake yet, so any tips would be appreciated.
Ryan O.
Out of Foam Board!
Approximately what rpm do you get with those?Good luck, I'm running mine on four of these:
Ryan O.
Out of Foam Board!
The Monster Motor, but Emax sells similar sized ones with better prices.
CampRobber
Active member
You're not wrong, but the "3a BEC" in a SimonK-style ESC is literally two 7805s in parallel so it's not like bussing more of them would be so much worse.
My personal advice is, if the FC UBEC isn't sufficient, put MP1584 modules (2 grams and $1.25 each) close to big servos and run them off the propulsion voltage.
Crawford Bros. Aeroplanes
Legendary member
I think about 7-8,000. Those are Tesla motors.
Monte.C
...
Monte.C
...
but Emax sells similar sized ones with better prices.
CampRobber
Active member
It's not really that hard to build something with like 500 watts/lb or whatever. The hard part is making it remain stable and in contact with the sea/snow/surface when driven that hard.
Crawford Bros. Aeroplanes
Legendary member
It gets even funkier when you try to do it on wheels using little foam landing gear tires
Ryan O.
Out of Foam Board!
I printed the very base of ny prop duct, and as you can see I'll need to enlarge the fuselage. Because of thag I'll be able to mount all the motors centrally, and I nay not need side skis after all. This should allow for really high speeds on 4s as well. I'm going to try to make the fuselage mostly ski on the bottom and all intake on the top. to minimize drag, and I've decided to shorten the thrust tube. The rear of my snow skimmet should basically consist of the end of the thrust tube and the tail. Sort of like a MIG 21, but the intake is on top, not the canopy. Also think of it as an upside down F-16. The reolacement motors should be here soon, so this should be finished relativelg soon. The Runcam split also shipped, and I'll make a waterproof case for the board so I can put it on this for FPV adventures at the local park.
Crawford Bros. Aeroplanes
Legendary member
Man I haven't even started on mine yet. I'm borrowing an EDF out of my U-2 for this.
Ryan O.
Out of Foam Board!
I've lightened the duct and reduced the tolerances to 0.8mm. For less distrubed airflow I've gone with a "pusher" with the motor behind the 5 firewall braces. I've also thinned the wall and the braces, but added 2 additional braces like on Ben Harbers BDF. Technically running this off 4s with 3 blade props is irresponsible, but I guess letting cool for a while between runs should be sufficient (famous last words) after all, it is winter and it's pretty easy to get some cold airflow over the motors. There was a big snowstorm which gave us a soft layer of snow about 15cm/6in deep, which isn't good for snow skimming (dense snow with an icy layer on top works really well, but that takes a few weeks to get the icy top layer) but mine shouldn't sink too far in.
Monte.C
...
Wow all you guys with lots of snow and quick build times are so bored with this thread by now.
Ok, a little progress here. Building up the tail, and now I need to build motor mounts on the vertical stabs. I'll try to just get it done at this point. Freezerburn don't care. It would be a crime to miss the next snow without having the chance to put all you guys to shame with my ridiculously fast little red rocket ship.
Ok, a little progress here. Building up the tail, and now I need to build motor mounts on the vertical stabs. I'll try to just get it done at this point. Freezerburn don't care. It would be a crime to miss the next snow without having the chance to put all you guys to shame with my ridiculously fast little red rocket ship.
Crawford Bros. Aeroplanes
Legendary member
I still haven't even started mineWow all you guys with lots of snow and quick build times are so bored with this thread by now.
Ok, a little progress here. Building up the tail, and now I need to build motor mounts on the vertical stabs. I'll try to just get it done at this point. Freezerburn don't care. It would be a crime to miss the next snow without having the chance to put all you guys to shame with my ridiculously fast little red rocket ship.
View attachment 188266 View attachment 188267 View attachment 188268
BlockerAviation
Legendary member
Nice build! I'm still interested but all the snow I got has melted. I did get a video of it while the snow was still there tho. I'll upload it soon.Wow all you guys with lots of snow and quick build times are so bored with this thread by now.
Ok, a little progress here. Building up the tail, and now I need to build motor mounts on the vertical stabs. I'll try to just get it done at this point. Freezerburn don't care. It would be a crime to miss the next snow without having the chance to put all you guys to shame with my ridiculously fast little red rocket ship.
View attachment 188266 View attachment 188267 View attachment 188268
Similar threads
