National Grid Electric Flight

Just seen the HobbyKing update on this power unit for electric flight/fright HERE
I believe there is an optional extra available of a small nuclear power station

Back of fag packet calcs:
spec says 70v; lets say 74v = 20 cells
100cc TO 120cc power 10bhp - 12bhp = roughly equates to 7.5kW - 9kW
Current to get this power 100A - 120A
So, 5000mAh cells @25c discharge. But, lets give them an easier time and thus a longer life and have a 20s2p pack working at 10c - 15c; thats 40 cells!
A pack of 5C Charge Loong Max Tipple 5000mah 5S 25C Lipo Battery from GiantCod costs £66.30. 8 of these required at a total cost of £530.40 and at a weight of more than 5kg. Could probably reduce the upfront cost and weight with higher spec cells but at the expense of whole life cost.
The charging should be a sight to see as well!
Just because you can doesn't mean you should. Unless I've got it all wrong.

Oh, another point I forgot. Over 50v DC there are issues surrounding safety legislation.

Allan,

You can soon raise those saftey issues as ive hopfully got a sample one on the way from another supplier to test

WOAW!!!!!!!!!
Wooo hooo!!!
Should give andy's turnbine a run for its money!!!

'EU low voltage directive' applies on equipment over 50vdc and 30vac. On a personal safety point at 70'ish vdc touching bare wires with damp/wet hands(as might occur on a flying field) can result in muscle spasam/cramp. This locks the muscles and you are unable to let go. If lucky the results are just burnt fingers. If your skin is more conductive then more current flows and its the amount of current that kills. Then there's the three phase AC thats generated by the speed controller. Not a massive panick but something to be aware of as this is starting to enter the area of concern especially in a potentialy damp/wet environment. What I'm saying is don't go round touching bare conductors as if it was a 3cell - 6cell electric jobby.

can't really see any benefit at 5kg, an engine setup doesn't weigh that much & you can only set yourself on fire not electrocute yourself

I know you can buy the gear but it's all fantasy, no reallity

Plus another 2.5kg for the motor and a bit for the controller. As I said ''Just because you can doesn't mean you should''. Fantasy Island Productions.

HAHAHA!! I'll say, bet it would be £1000+ for the (bloody heavy) power package

ha ha ha, belive me ive no intesion of keeping a 20s setup its just for testing although it may never arive as there is lots often spoke about (although i did have my hands on the 80cc equivilent one this weekend

But in fairness 100cc/9KW is small time, 150cc/14KW is were its at

test run
https://www.youtube.com/watch?v=r5Vgyz_74pQ

and the maiden from a moth or so ago

https://www.youtube.com/watch?v=Y7I39PUeI5g

looks a pretty smart setup, a lot smaller package than I anticipated, did you see the size of the speed controller & motor wiring or should I say cableing

I'll happily test it for you... It would be brilliant in a little monkey bike

The original 850cc mini developed 39bhp at the crankshaft but only delivered 19bhp at the road wheels( transmission losses). The above set up is 18.5bhp. You could put it in a small car. You would of course require a lot of spare battery packs to go anywhere!

Ok so as Alan rightly says your looking at about £1000 for the electric set up, I would argue its cheeper than Petrol!!

1x DA100 - £1058
http://alshobbies.com/shop/cat.php?id=699
or even a DLE 111 - £599
http://alshobbies.com/shop/cat.php?id=817

Add 2 cans and headers - £100 each

Switch and Batiery - Another £10 or so

others like fuel dots and tygon tube - another £20-30

Then £5 ish every flying sesion for fuel

Electric dosnt look to bad dose it?

M

Not till you factor in the charger power supply/s generator or field battery big enough for an 18 legger truck and you still have a model with a higher wing loading. Not a problem for us CBM's but then again I'm a confirmed petrol head

P.S. You also end up with a model that like it's petrol counterpart is good at removing body parts but is also capable of electrocuting you or not quite severe leaving you paralytically attached to it's motor or associated wiring

Petrol FTW!

Not as bored as i am,

That Pletenberg gear is the nuts mind! what price is a DA120 then?

$1200 that's £1200 as no discount even if you buy it in the States

MTW or K&S cans or pipes & headers £300 & you could thoeretically fly as long as you want for a max £10 a day & no silly chargers or power plants to drive the charger

you would need 6 14S packs to have a good session the prices I postedf are for three 14s packs

I'm sure you could setup cheaper but whats the point even if you can, why would you, if you put a DLE or similar then the price would fall dramatically, set of cans for less than a £100 with headers

so comparing a Pletty (price above is for a 14kw/150cc set up) with a DA120 is kinda like for like IMO

So a DLE and the Hobby City motor again on a par, your not going to jump into big electric if you dont already have good chargers and stuff so that price is negligable.

Not saying i agree with it, 10s in 'Cath dose my head in just merly saying the prices are not as expensive as they first seem. I mean comon who has time for 6 whloe flights

Mark Barnes wrote: I mean comon who has time for 6 whloe flights

As are resent Poll showed the club average is 3-4

https://rdmfc.forumotion.co.uk/general-discussion-f1/on-average-how-many-flights-per-field-visit-t1546.htm

So one of these http://robotbirds.com/catalog/product_info.php?cPath=9_161&products_id=4884 and a couple of chargers with a few spare hours in the evening, jobs a good un

3 or 4 may not sound alot but if the flights are lasting 10-12 mins then thats quite a bit of flight time

Mark Barnes wrote:

Mark Barnes wrote: I mean comon who has time for 6 whloe flights

As are resent Poll showed the club average is 3-4

https://rdmfc.forumotion.co.uk/general-discussion-f1/on-average-how-many-flights-per-field-visit-t1546.htm

So one of these http://robotbirds.com/catalog/product_info.php?cPath=9_161&products_id=4884 and a couple of chargers with a few spare hours in the evening, jobs a good un

Bloody hell Richie was that busy flying yesterday he had to have refreshments taken out to him at the strip the waiter had to use the club electric trike