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Author Topic: 220mph Proximity  (Read 12197 times)

FPVSteve

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Re: 220mph Proximity
« Reply #90 on: June 03, 2020, 10:56:51 AM »

Well done Rupes....!

inb4 400mph....
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ched

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Re: 220mph Proximity
« Reply #91 on: June 03, 2020, 05:25:44 PM »

Wonderful, well done. Everything worked perfectly first time. What great work.
Loved the under hex drop shots  ;D especially slowmo.
You used a bit more fuel than the current would suggest but WOW perfect flight and you made it back to land. Loved the flypast of the quad at low level where you could hear engine!!!
Great, can't say well done enough..
Congratulations on all your hard work and many many hours of work.

omegooliebird

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Re: 220mph Proximity
« Reply #92 on: June 03, 2020, 05:46:47 PM »

Thanks so much for the support along the way, and suggestions. It all helped this project be a success! So happy!

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Coyote

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Re: 220mph Proximity
« Reply #93 on: June 10, 2020, 03:36:27 PM »

Bloody Epic !
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omegooliebird

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Re: 220mph Proximity
« Reply #94 on: October 02, 2020, 09:46:48 PM »

Quick update for those following..

Sorry for not making another flight yet! After all the up's and down's of getting the plane working, and the nerves to fly it... I needed to put it to bed for a bit, so I can truly enjoy the next flight.

In the mean time I have been putting together a new power system for the electric Fusion.

Battery: 14s (4s+4s+4s+2s in series) of 2,000mah Tattu 'R' line V3 120c cells. Should be able to output close to 10kw.
ESC:     APD F-200 which should be able to flow 200a-300a at 55+volts.
Motor:   ????

It is using a folding prop in the region of 7x12 (the length and pitch will be tuned with different yoke/centrepiece). It should have an efflux speed of around 5-600mph..but I am mindful that this may prove too much for the motor in the end..again we will see.

The plan is to get this set-up ready in the plane, and fly that and the jet on the same day..with the aim of trying to get 600kmh with the jet and 500kmh with the electric. Big goals, but you have to have dreams!

« Last Edit: November 23, 2020, 12:23:11 AM by omegooliebird »
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Coyote

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Re: 220mph Proximity
« Reply #95 on: October 22, 2020, 07:03:59 PM »

Looking forward to seeing the video :)
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ched

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Re: 220mph Proximity
« Reply #96 on: October 22, 2020, 09:05:08 PM »

wow, thats some power. Looking forward to the vids too.

FPVSteve

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Re: 220mph Proximity
« Reply #97 on: October 22, 2020, 09:11:04 PM »

Wow that is some spec. And I thought my 4s Mini Talon was fast lol.

Good luck!
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omegooliebird

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Re: 220mph Proximity
« Reply #98 on: November 01, 2020, 05:39:29 PM »

Hi friends. Had the first smoke test with the 14s battery/ESC/motor today. Scary, screamy, vicious little rotter :-) All good, no desync or smoke. Supersonic tips already at 3/4 throttle, so will have to really load it up with pitch on the prop..

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omegooliebird

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Re: 220mph Proximity
« Reply #99 on: November 19, 2020, 12:27:38 AM »

Folding carbon prop is here from Germany, but the blade area looks too small to use all the power this set-up has, so I will get more blades and run it as a 3 or 4 blade most likely.

Increasing diameter would increase tip speed, so more blades will allow the high rpm I want for thrust efflux speed, but with the thrust volume increased from the extra blades. Lunch is never free though, the amps would skyrocket, so it may be a 3 blade compromise.

Will fly the prop on a 6s Funjet to see how it compares to off the shelf props. Let's hope the blades are strong haha!

« Last Edit: November 19, 2020, 12:29:18 AM by omegooliebird »
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ched

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Re: 220mph Proximity
« Reply #100 on: November 20, 2020, 10:51:23 PM »

Looks nice. What sort of speed can prop tips go without causing issues?
I know that a military helicopter had special blade tips developed to enable them to go super sonic, if I remember correctly that is, can't say more than that, you know official secrets etc.... :-) 

Dillwhacker

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Re: 220mph Proximity
« Reply #101 on: November 20, 2020, 11:11:26 PM »

You're going to have to do that collet up mighty tight (:+}
« Last Edit: November 20, 2020, 11:13:44 PM by Dillwhacker »
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omegooliebird

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Re: 220mph Proximity
« Reply #102 on: November 21, 2020, 02:24:31 PM »

Thanks for the replies, wondered if it was still worth posting on here.

Yeah prop tips have to stay sub-sonic really or there is huge efficiency losses and potential for blade failure from the pressure waves. I haven't cared in the past, as that was the only way to get the pitch speed up using off the shelf props...but for 500kmh+ I'm going to need every bit of efficiency. Interesting that there have been blades designed for supersonic use, but I imaging it was polishing a turd somewhat.

And yes..that collet lol.. will have a slot milled in it to key the yoke in..the shaft-collet friction will be the issue, but may go up to an 8mm shaft on the motor to add surface area for that transfer of power. 8-10kw will destroy just about anything.

I am also working on another route to 500KMH electric.. using this rewound Scorpion 4535 at 14s/200a with an 11x27 Powercrocco prop on an HJK Monster F3S plane. Serious stuff this time ;-0
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ched

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Re: 220mph Proximity
« Reply #103 on: November 21, 2020, 03:18:35 PM »

Interesting that there have been blades designed for supersonic use, but I imaging it was polishing a turd somewhat.
There are a few non secret details of early dev on blade tips here: https://www.bahg.org.uk/puma.htm
I worked for DRA/DERA/QinetiQ testing jet and gas turbines :-) I knew a few who worked on the tips testing.

omegooliebird

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Re: 220mph Proximity
« Reply #104 on: November 21, 2020, 03:49:33 PM »

Very interesting mate! Thanks for the link! It would be interesting to hear the findings of the testing.. rotor blades still look unchanged on commercial heli's, so I guess there must have been trade-offs. The faster the advancing blade, the slower the retreating blade, so there must be a max speed for the advancing blade on a heli. But for our application, it is just the blade rotational speed coupled with the forward speed at 90 degrees to rotation that dictates the actual tip speed, some kind of trigonometry to work it out, above me lol. But making supersonic tips work would mean you could use less pitch, which i turn means some static thrust.. unlike an 11x27 haha!
« Last Edit: November 21, 2020, 03:55:43 PM by omegooliebird »
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