This was a fun test that I had to do a few times over to get rid of most variables as I could. I was blown away by the difference the pitch of the prop, and the different designs of props make in the top speed of a racing quad.
quad as tested:
CMW Merica – https://www.catalystmachineworks.com/collections/frames/products/merica-5-inch
Hypetrain Ummagawd 2150kv- https://store.rotorriot.com/hypetrain-ummagawd-2306-2150kv-motor/
Spektrum ix12 with diversity rx- https://www.horizonhobby.com/products/SPMR12000
RF Revolt FC and bolt 4in1 ESC-
Runcam Micro swift- https://store.rotorriot.com/runcam-micro-swift-2/
tbs unify race vtx
Electronics
DAL Cyclone c5045- https://www.dalprops.com/collections/cyclone-3-6/products/c5045
Hq 5×4.3×3 V1s – https://store.rotorriot.com/hq-durable-5×4-3×3-v1s-pc-propeller/
Gemfan 5152 tri and bi blade – https://www.catalystmachineworks.com/collections/propellers/products/genfam-5152-s-triblade-prop
Who was recording the speed runs?
Time for some Crossfire. 🙂 Great speed testing. APC makes some great props for speed!
Pretty much as I expected.
Cool test! Bi-blades seem the way to go. As long as it can handle the speed through the corners. 😉 It sure can handle a 100+mph crash! Great frame…got two myself.
Nice job!
#teamfailsafe
Great test Gabby! I like your method of using time over distance. I believe this is the most accurate way to measure speed. While during that run you may actually have some spike in speed that isn’t getting captured, its pretty close. So in actuality you probably hit a speed on each run slightly higher than what you averaged out for the run. With that said, i believe this method is more accurate than a GPS module on the craft or radar gun on the ground.
Pitch can be a little obfuscated today with new props using advanced ratios and different ways to calculate them vs old style props. Steeper inner scoop with a stiff blade is a good recipe for speed though. Nice video, the bi Blade was awesome haha
Did I miss the results somewhere?
woo! thanks for including my fav right now, gemfan 5152 bi blades 🙂
Young beast
This matched my expectations for these specific props. I don’t think it’s just pitch at work though to figure out top speed. For example, in my testing the RaceKraft 5051 props have huge pitch, but the top end was awful for me. Then again it also could have been the battery that couldn’t keep up with their amp draw.
That being said, I would have loved to have seen your amp draw with 2150KV motors and the Gemfan 5152 tri-blades. I did get a bit of a chuckle when you said 6S would keep the load on the battery low. I’m pulling 120A on 6S with 1900KV motors. 2150KV should be pulling even more. Then again, your battery held up like a champ to that abuse, so I’m really very curious what sort of current you were pulling…
Thanks for the video! It was very entertaining!
What do you hit in openwheel racing? That quad rips!
I didn’t pay attention to efficiency during the video but I’m curious if there was a noticeable difference in efficiency?
I think you are desyncing – this is caused by active breaking causing a voltage spike and overwhelming your ESCs – it happens when you decelerate – your motors become a generator – i had this issue on two 6S quads – added bigger caps and it went away. Did you notice any sag differences between the props?
Very nice test! 130mph club! Please try some APC props on this! They have a 5.1×5 bi-blade and a 5.1×6 bi-blade. both of these were made for speed runs like you are doing. I would bet you could hit close to 140mph or better!
Hahaha, “#teamfailsafe” … ah Nurk, that’s funny man. It’s all pretty good now days but I will say it’s surprising how much range I got out of my unify pro vtx when the ufl popped off… no antenna at all and it worked ! I can’t bash the spectrum stuff, I’ve had A ( one ) failsafe with my Taranis.. although for the record I believe it was interference but no way to confirm I guess.. great run Gabby ! Smoking fast man !