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Member postings for David Wainwright

Here is a list of all the postings David Wainwright has made in our forums. Click on a thread name to jump to the thread.

Thread: Which 12v motor for 30" carbon prop?
10/07/2017 20:53:27
Now see here,

If you had bothered reading original post you will see it was a request for info and background as to neivity.

Not sure which part of your answer addresses this.

For your info, I trained and qualified in Derbyshire several years ago. During a session teaching, I saw folk steering their wings using cordless leaf blowers. I was never after a five grand rig, just a compact and light alternative for extra thrust.

If you would care for a lesson get in touch!

As for rpm, I'll be happy with max 5000 after doing calculations.

Thanks for the unwanted concern however. X
10/07/2017 20:40:32
Condescending? You don't know what it means!

Edited By David Wainwright on 10/07/2017 20:54:05

10/07/2017 20:00:58
Yes, this has been covered and refer to first post re what needed.

Seen 80cc motor, batteries and controller for under 500 that will produce what is needed. Didn't want a rocket.

Thrust produced by above will be more than adequate.

Thanks to those who chose to share knowledge rather than be blind to fact knowledge is only power when shared.
10/07/2017 17:58:24

This says it will power a 27x12 prop so 30x10 ok?
10/07/2017 16:47:48
Blimey. That costs more than the motor! Wasn't expecting that! Clearly a couple of lithium car batteries not gonna do either.

Thanks for info.
10/07/2017 16:17:46
Thank you. Very useful. Guessing lithium power packs and hefty potentiometer needed.
10/07/2017 16:06:22
And I'm here for info, not to be judged thanks.
10/07/2017 16:04:57
That's a really helpful post. Thanks. Looks like battery packs gonna need reviewing but that's clearly a substantial motor. 10kw kits are over four grand so this looks feasible if can keep price batteries and controller down. Is 150cc equiv to petrol output then?

Thanks again for your time, input and taking me seriously.
10/07/2017 15:54:12
So how about redneck remedies like converting an alternator or using washing machine motor and inverter?
10/07/2017 14:58:53
Guessing this no good? Look at this on eBay
10/07/2017 14:19:39
Must remember not to use hash tags as they make folk think of Donald. Understandably offensive.

Edited By David Wainwright on 10/07/2017 14:20:07

10/07/2017 13:42:56
Ok, thanks for replies so far. Just to clarify, this was never supposed to be a serious bit of kit designed to fly 90kg. For a start, the wing is what flies it. Am just after a motor to power the prop.

As an incentive and seeing as they have just delivered two props by mistake, anyone who can come up with a viable option which falls within parameters, and they pay postage, they can have a free, 30x10" carbon prop as thanks.

Remember, I'm not building a rocket.
10/07/2017 13:12:25
Using model parts hence question. Unsure why you felt this answer was needed as contribution tho. Thanks anyway.
10/07/2017 13:10:42
Actually they are about 4 hp. Even the petrol ones aren't double figures. Original question did say I was after a basic device delivering thrust and I quoted angle grinder experiment

Wasn't after Frank whittle plans.
10/07/2017 08:35:30
So which set up would you guys say would power it with substantial thrust? Looks like I'm back to drawing board. Oh well.
10/07/2017 08:21:56
Wow. Looks like I may be using this as a ceiling fan then lol. Not sure about calculating stuff but wanted enough thrust to push around 90kg through the air so what rpm needed for 30x10 prop is unknown factor to me. Main objective is to simply achieve thrust. Obviously weight is a factor so wanted to keep battery weight low as poss. Just thought would be interesting feasibility project before having a go. Thanks for all input so far.
10/07/2017 01:49:36
Hi. 30" x 10" carbon prop mate. Thanks.
10/07/2017 01:48:43
30" x 10" carbon prop not metric
10/07/2017 01:47:38
Hi. This is the propeller I am using.Look at this on eBay
09/07/2017 20:07:15

Excuse ignorance as brand new to this hobby so please speak in dim terms although I understand a little.

I have a 30" carbon prop I want to get spinning over 10,000 rpm and run off a speed controller (have 70a one) and 12v lithium car battery.

What kind of motor would provide enough torque and speed to achieve this please?

If you're wondering, I'm building a simple paraglider fan rig. After experimenting with an 8inch prop and a cordless angle grinder I was pleasantly surprised with thrust.

Any tips in simpleton language please. Lol. Thanks in advance.
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