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I do, otherwise the power surge is just too high at beginning of flight and not enough energy left for the remainder to complete it to 10 rounds within 1000Wmin. But I know there are also others who just go full throttle from start.
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Yeah same idea for f5b, lots of power loss with cavitation, consumes too much battery.
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As you know i have a Mega 22/45/1E 1950kv at mine...but i'm going to need a longer motor shaft,so need to order a new mtr,was thinking about a 1EE version which is 1900kv with a 5mm longer magnet....but it still mite be abit 'hot'... Basically i have Koch 7x12,8x13 and 8x14 props,with -5° thou to +5° hubs. Your 16/40/2E F5D 1545kv,on 5s with DUPs 7x10....is that drawing approx 65a? If so,what do you think about a 22/40/1.5ER (1545kv) on 5s with either the 7x12's or 8x11 threw to 8x14 prop sizes....? Your helps appreciated,cheers! |
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I can't see the 22 size motor and the props you mentioned being a problem, especially the smaller ones, the 22-40 should handle them better. Do you know how any of the props you might use compare to APC sport props, DUP's 7x 10 on a 30mm spinner is close to a 7x 9 APC Sport IIRC. Where's Gryph these days anyway, he knows more than both of us... Have a quick look on the Jolt 2 thread and robusp used a 22-30-2E on a Mr Koch prop https://www.rcgroups.com/forums/show...&postcount=354 . you'll have to scan the thread to double check the cell count he used, or PM him. Shame the 22-45 needs a longer shaft, maybe it could work on a lower cell count, have you done any static tests with any of those props to see what figures you get? You could just get a longer shaft fitted although it's a bit heavy at 300g. And if you send the motor in for a new shaft what about making it an EE motor to drop the Kv a bit more, you'd need to find out what the Kv would end up at if you did that though, but it's another option. |
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Yup i've spoken to Dan....with a 22/45/1EE version (mines 1E,1950kv) a 1EE drops the Kv to approx 1900.
I was thinking 4s and 8x11-8x14....but because theres bugger all data on the 22/45...its hard to know a starting point. Nah i hav'nt prop tested the 22/45/1E yet...i need too really. Then i can wrk out what size esc i need....i'd like to be able to get away with a 130a CC lite.(lite weight) Its either a in runner or i'll have to look at something like Pyro 600. Then i looked at the 22/40/1.5 and thought i may be able to use that...on 5s (don t want to run anything more than a 5s (wantta keep batt weight dwn).. |
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Its a combination of lack of data on both motors and the folding props, not many post about using them anyway.
I'd think going off what was posted in the Jolt 2 thread that any motor from the 22-30 size up will be fine, yoke size will play a part though so going for the bigger 22-40 size or bigger might be a good idea. You said you've got various props and offset spinners so you've got plenty of options to play around, my 16-40 setup didn't have that option, 7x 10 on a straight yoke, unless I wanted to try reducing the diameter to get a bit more rpm. I'd do some static tests on 4s with the motor you have, 1st test with the smallest prop on a zero degree hub and see how many amps it pulls and take it from there. I'd hope a CC130 would be big enough too. |
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High performance narrow blade folding props and generic flying? This site is "High Performance", not generic, GM props are narrow and useful at higher rpm, not very good when used at lower settings. F5D, now refered to as F3-E airframes are the same, made to fly well at speed, don't fly the best at lower speed. Generic to me dictates a warm-liner design, thicker airfoil, more surface area, better wing loading. To run 10" - 12" folders using a gear drive, 30mm diameter motors and 5.2 to 6.71 ratio gear box fits slim fuselage, to use a direct drive and produce similar power would take a motor of greater diameter. There are speed flyers using custom small diameter folders and direct drive outrunners but those are serious set-ups. Check e-calc and compare your direct drive idea to a similar rpm geared set-up with 10x23 GM and judge. Consider your goal and do some research, run time, thrust, speed you prefer.
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Last edited by C Brown; Oct 12, 2020 at 11:48 PM.
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Throttle ramp is almost essential if you are to get the best out of the limited energy available when competing in F5d. Cavitation on launch is just a waste of time whereas a ramp can save that little bit of energy that can be so essential at the end of 10 laps. But as Peet says some don't bother.
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I'm more so curious of the actual flight speed range of high performance f5d folding props. Not saying i want to fly at 90mph. Just wondering if you can fly with 10-15 % less power or airspeed efficiently if you reduce the flying weight.
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Could anyone tell me what the bolt pattern diameter is for the NEU-1110-1.5Y-5.2 setup.
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Information drawing at <old.neumotors.com/NeuMotors/Drawings.html> you most likely have a P29 gear drive, this replaced the older and larger P32. For P29 it is a square pattern on a 23mm Diameter so diagonal corner to corner= 23mm, side to side = 16.26mm. The screws are 2.5mm.
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Last edited by C Brown; Oct 17, 2020 at 10:57 PM.
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