Fast Roo

[Swale]

oh PS guess who found a 600 class motor mount for the ROO anyone know where I can get a tanker of glass fibre resin to hold it on LOL?

I cant beleive they didn't even include any carbon wing spars in the kit LOL imagine if you forgot.

[simonh]

oh PS guess who found a 600 class motor mount for the ROO anyone know where I can get a tanker of glass fibre resin to hold it on LOL?

I cant beleive they didn't even include any carbon wing spars in the kit LOL imagine if you forgot.

I used Carbon Micro Tube 2.5X1.5mm from Robot Birds. A 600 class motor - looking forward to seeing that in the air. Is it an outrunner? Guess yr going to need to make a new motor mount. Looking forward to seeing that fly....

[Swale]

did you use more than one tube on each wing???

just hope its strong enough

[simonh]

No - I just used one tube in each wing - using the slots that were already there.  Be interesting to see that motor mount - cld be a good alternative to the standard one

[Swale]

talking to gareth I think it wont 

looking at these now http://www.angliamodelcentre.com/index.php?cPath=8_11_308

[Swale]

hi simon,

what het motor was you running again still trying to decide what motor to go for?

not that im trying to out do you as such I just wanna see how much this roo can be pushed and how insane it can be made sort of safely LOL

think this bird may have to be maidened on a closed field with no one around LOL

[simonh]

I'm using one of these.....

HET 2W-20

http://www.giantcod.co.uk/typhoon-edf2w20-p-405097.html

[simonh]

not that im trying to out do you as such I just wanna see how much this roo can be pushed and how insane it can be made sort of safely LOL

think this bird may have to be maidened on a closed field with no one around LOL

lol its cool - be fun to see how quick it can be made to go with you at the sticks tho at the moment that HET motor is more than I can handle  have put in a throttle to aileron and throttle to elevator mix on a switch that should correct the torque roll and nose down on full throttle. The mix is set to start at 40% throttle so it wont try and pitch the nose up at low speeds.

[Swale]

Currently the spec is as follows.... with the very kind help of gareth and simonh.

HET Typhoon 1w30
       kv 4400, max 120 amp

Hobbywing Platinum 150A ESC (oh my where am i gonna mount this bad boy, lots of foam cuting.....lol ) 

EMP prop size not yet known will depend on the amperage & speed tolerences have ordered a bunch so trial and error (watt meter to be used of course)

Servos undecided yet likely to be hs85 or metal gear equivelant
*servos going to be HS85MG*

Power Turnigy 4s 3300mah 35 - 70c

Mods planned....

Add magnets to canopy, add dual 2mm carbon wing spars to each wing, 0.5mm carbon tube re-inforcemant of aileron control surfaces (possibly glass fibre coated), pin hinged ailerons, reinforcemant of motor mount proabably useing ply cut larger than the mount as recommended by simon and possibly some glass fibre to further strengthen it all, offset motor thrust angle to help reduce unwanted rolling etc.

If all goes well at a later date I'm also considering adding rudders for some extra aerobatic capability and night lights for darker nights.

All in all I'm very doubtfull this will meet or exceed the funjets speed but I very much like the look of the Roo Im hopeing to get a sort off fast stryker alternative.

dear me what happened to a quick ''EASY'' cheap build LOL

[Swale]

race rat 1w30 test

wait till end

[Swale]

Hmmmm slight problem I worked out (if I done it correctly) that at WOT I would get a duration of under 2mins LOL assuming I draw 120A
Is that correct.....

If so then Im gonna need like 5A to get like 3 min.....Which sounds heavy aswell LOL.....

Cant be right am I missing something.......I mean will it even be able to sustain 120a draw?

Heres the calculation I used....

lipo capacity: 3300mAh
Divde that by 1000 to get A/h = 3.3

Take 3.3 and divide by the AMPS you will be pulling (120a)
2.2/120 = .0275 <-- flying time in hours.

Take the number times 60 to get minutes

.0275 * 60 = 1.65

[simonh]

That calc looks OK to me.

I'm using 2650 4S packs in my setup though I do have some 3300 MaH packs that I use for the Habu. These work OK in the Roo but I'm not sure about going any heavier

My setup is taking around 80 Amps at WOT. With the 2650 packs This would give me about 2 mins though I don't (cant currently) keep it at WOT all the time so in practice get about 5 mins or so.

You may want to have a couple of 3S packs as well for when you dont want to be a total hooligan. I have a couple of 3S 3000 packs for mine. 

The Roo has a really big flight speed range - it can go very fast but can also do very big accurate aeros (unlimited vertical) and it glides very well - though less so with a heavier pack. You may find that you wont want to keep the throttle to the max all the time when you fly it.

The canopy is pretty big on the Roo - will Gordon fit in it??  I think we need a pic of him in the cockpit!

Being the interfering Admin person that I am, as this is now looking more like a build thread, I'm going to move this topic (again....) to the building board.

[Swale]

hmm yes proabably will give the 3.3a packs laying around a go and take it from there.

Funny enough since the Roo has arrived I haven't seen Gordon since......after a bit of hunting I managed to spot him...



It seems that the roo is practicaly made for him although oddly Gordon didn't seem to agree......

[Swale]

So the ROO is pretty much done, All I need to sort now is the UBEC the one I have seems to be under powered

LoL Check out the ESC 


This things power is insane it screams on 4s its drawing 150amp and 2000w with a 4.75x4.75 prop its a joke even by my nutty standards iand will most likely be too much for the motor to handle.

Going to aim to maiden tomorrow will probably solder the new UBEC in the container....will be doing 3s runs tomorrow and 3s feels like the funjet on 4s....I just hope I dont rip the wings off 

[Swale]

p.s debating wether to make gordon the test pilot??? trouble is I think he will have to be....errmmm shortened LOL