View Full Version : Rotorworkz FCS Frame Conversion for Guai

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Charley Stephens
10-03-2007, 06:13 PM
OK Fella's here it is

I bring you the

Rotorworkz FCS Frame kit

Note This is the prototype frame conversion for Guai Hurricane shown with a Flight power 6s1p 3300 Evo 20 it slides in with plenty of room to spare!

Here is a list of some Features
Rotorworkz design adjustable motor mount with cooling fins
Servo layout change for Aileron and pitch
New Aileron and pitch ball raced bell cranks
Composite frame doubler for extra Stiffness
Stacked frame design allows extra room for many battery choices and component layout
ESC tray with Velcro and zip tie slots
Gyro Tray with Velcro strap slots
All Light weight CNC Aluminum bearing blocks, boom blocks, Landing gear mounts
Break away Canopy tabs

well..... you guys look it over :)
also notice stock plastic frame next to my frame for comparison general weight diffrence
my frame in G-10 with aluminum parts is 20grams lighter that stock plastic no bearings no screws :D

Price is not set yet but it will be cheaper than other frames even in CF ;)

10-03-2007, 06:35 PM
Wow! I really like it and I am glad I waited.How soon ?Will a FP 6s 3700 slide in there?

10-03-2007, 07:04 PM

Let us know when we can get it!

Can I stack my old 3s1p 2200's on top of each other in the battery tray, until I work my way up to 6s?


10-03-2007, 09:37 PM
AWESOME Charlie! Lookin good baby.... This is what I have been waiting for to get my hurri flyin again :)


Charley Stephens
10-03-2007, 09:58 PM
Wow! I really like it and I am glad I waited.How soon ?Will a FP 6s 3700 slide in there?

Here is approx bay area specs 48mm tall x 49.5mm wide

I will post when they become available I am doing final touch up stuff then into production

Thanks Bob, this frame did come out nice!


10-03-2007, 10:36 PM
sweet! so from the dimensions it should fit a 6s 3700 pack. Finless you gotta get us a review and video. I been waiting to upgrade my hurricane. Now may the time to get this heli back in the game!

10-04-2007, 04:10 AM
Nice... looks like two HXT 5S2300s should fit side by side and on their sides.

My only concern / question is how well it will roll. Having the battery weight slung relatively low has to impact rolls a little?

Tom Viper
10-04-2007, 06:37 AM
Looks nice, but how will the CP workout? The stock is balanced with the packs far forward, so when you put these under the main shaft, won´t that effect the CP?

Will the stock canopy fit this frame?

Anyway, nice job! Will you produce it in G10? Price?
I belive this frame will be great for all thoose people who want to upgrade to 580mm blades as well. And, alot lighter then TREX600 as well.

10-04-2007, 07:26 AM
Wow MAN!!!! It is really COOL!!!!!

10-04-2007, 02:59 PM
Looks nice man.... It also looks like it will make find the CG for the PACK (S) a lot easier. I think once i get back to the states im gonna pick one up and upgrade to a 6s configuration.

10-04-2007, 03:06 PM
that is just simply awesome charley!!!!! i can't wait to get myself one, in fact if you want to sell that prototype i'll take it :D


10-04-2007, 04:19 PM
me too, he should sell the prototype on ebay :)

I have never liked the battery tray on the stock Hurricane, this seems so nice. I hope there will be an option for smaller servos also (9650).

10-04-2007, 05:24 PM
I see a video in my future ;)


10-05-2007, 02:41 AM
Hi Charlie,
Nice frame!!!
But Looking carefuly I've got one question:
Why did you make additional hole for boom support? It makes the rear part of the frame weaker, instead you can use existing lover or upper bolts
just IMHO

10-05-2007, 03:44 AM
I agree. Also moving the boom support to the higher position would make it very easy to put in batteries without removing the canopy

10-05-2007, 05:50 AM
Hey Charlie,

that's really a great design. As I'm user of A123 cells, I have one concern about the size of battery bay.
You gave the size of 48mm tall x 49.5mm wide. The diameter of a A123 cell is 26mm, which means, if I make a pack of 4 cells beside each other, I need space of at least 52mm (55 to have space for placement, including shrink foil, fixing tape and balancing/power cords).

Is there any chance to make the bay little bigger?

Thanks, Karsten

10-05-2007, 09:51 AM
I'm in a very similar situation to Kalle660.


I love the frame, but it doesn't do me much good in the battery deparment. I would like to maybe eventually end up with a 6s setup, and am really interested in trying A123. But for right now I have several matched sets of 2200's, and in measuring them last night there isn't enough room to stack on top of each other in 48mm, and on edge I would need 56mm, for my tallest packs.

I know you can't please everyone in designing products. But I, like many (i think) would like to upgrade to a frame like this but have several hundred dollars already invested in 3s packs. It would be nice to be able to use my existing packs until I can afford to upgrade the power system.

Could you maybe offer a spacer kit for the lower frames that would allow us the wide battery option?


Hey Charlie,

that's really a great design. As I'm user of A123 cells, I have one concern about the size of battery bay.
You gave the size of 48mm tall x 49.5mm wide. The diameter of a A123 cell is 26mm, which means, if I make a pack of 4 cells beside each other, I need space of at least 52mm (55 to have space for placement, including shrink foil, fixing tape and balancing/power cords).

Is there any chance to make the bay little bigger?

Thanks, Karsten

Charley Stephens
10-05-2007, 10:47 AM
Thanks guys for your comments makes designing these things more fun as my hobby>

As for opening the battery bay I will look into it. I think adding spacers is easy alternative at this point, I would like to consider making correct size parts but problem thus far is jigs and fixtures are made for the landing gear mount. So...... I will need to discuss with machine shop if it is possible to make changes without changing fixtures I do want this to be the one stop frame I will give my best to try and address all of your needs! But I do have to consider cost $$$ of these changes


I like your input so I made the change doing so allows removal of extra unneeded hardware thank for your input!

Also below is a picture showing approximate dimensions you have in battery bay hope you can see them :D

10-05-2007, 12:38 PM
yeah i'd like to put in A123's in double shotgun style packs too, but i figured i'd manage to do that myself as i have some cf sheet that i was planning to use along with some spacers and some small metric bolts to enlarge the battery tray to 55x55mm

charley if you can make these changes to the kit that would be even better but if they can't do it without modifying the jigs it shouldn't be that hard for most of us to modify it to suit :)


10-06-2007, 12:47 AM
Well just adding fuel to the A123 fire. I was hoping these frames would simplify A123 on the H550 but as they stand, they make it impossible and the stock plastic frame is better.

Shotgun packs need approx 30 x 56 x 210mm (for 6s, 280mm for 7s-8s)
Slab packs need approx 30 x 70 x 164mm (for 6s, 191mm for 7s, 218m for 8s)
Brick packs need approx 56 x 70 x 83 (for 6s, 110mm for 7s-8s, 137mm for 9s-10s
Triangle packs need approx 56 x 52 x 140mm (for 6s, 210mm for 7-9s)

Of these configurations, widening the lower frame will still only allow for shotgun packs at the most due to the height restriction of 39-48mm. If the lower frames could be made just a 5mm taller that would allow triangle packs to fit in the tallest front section which is currently 48 x 49.5 x 150mm. I think that would allow, for example, the existing 7s A123 packs to fit with the skinny "nose" pointing to the rear into the shorter area.

I also think a design that excludes the use of a pair of popular 3s packs is disappointing. Consider these dimensions of some popular packs:
----------- -- ---- -------------------- -----------
Brand #S mAh 1-pack 2-packs
----------- -- ---- -------------------- -----------
MaxAmps 3 2100 24 34 98 48 34
FlightPower 3 2100 21 34 113 42 34
FlightPower 3 2170 24 36 112 48 36
Hextronic 3 2200 25 34 101 50 34
AirThunder 3 2200 30 37 113 60 37
FlightPower 3 2500 27 34 110 54 34
MaxAmps 3 3300 34 55 66 68 55
FlightPower 3 3300 19 44 142 38 44
----------- -- ---- -------------------- -----------
FlightPower 4 1800 31 30 106 62 30
FlightPower 4 2100 27 44 123 54 44
FlightPower 4 2500 34 35 111 68 35
----------- -- ---- -------------------- -----------
Polyquest 6 2500 46 44 121
FlightPower 6 3300 38 44 142
FlightPower 6 3700 42 44 142
----------- -- ---- -------------------- -----------

It's just a quick round-up of some popular packs (no flames about TP being missing, I didn't have the figures to hand). Most of those cannot be used 2-up in the frame as it is currently.

If you are unable to accommodate these configurations I am sure the frame will still be popular, but not as an upgrade to most folks with existing investment in 3s packs (or 7s A123) and will really only be suited to those looking to move to (and fund) a single LiPo pack solution.

Thanks for sharing your progress with us and considering our feedback. :thumbup:

10-06-2007, 01:42 AM
Nicely put Kenneth.

Thanks for the investigation!!. I'm Flying A123 at the moment, and I guess that I’m one of those that want to invest in a 6S lipo solution. Thinking about an airthunder 5000 6s pack. That should give me some reasonable flight times. :YeaBaby: Hope that one will fit.

But from what I notice seeing the picture: The lipo is right in the middle of the frame .. Wouldn’t the heli be tail heavy? Right now with the 7s A123 sticking out from the front the balance is o.k. So IMO the hurri needs quite a bit of "nose" weight to get the CG right.
I hope I'm wrong about that, because I really like the idea to have the "root canal without anesthesia pain" expensive lipo to be within the frame :lol:

I love the looks of the frame !! I hope they will be available soon !!.


10-06-2007, 12:41 PM
I just took time to 'stack' two of my HXT 2300MaH 5S packs and it looks like my initial thoughts were wrong.

Whilst the 'main' part of the pack is just low enough (measuring the cell stack) the end where the cells connect and the power cables come out is slighly taller... so you end up needing 53 to 54 mm. The battery bay is wide enough but not tall enough.

Charley Stephens
10-06-2007, 06:54 PM
OK Guys As it stand I cannot make the frame wider due to to much $$$ But have considered taller I will look at it to see what I can do

AS for CG those pics in the first post just Show the room available to install Lipo packs My Heli CGs with the 3300 pack flush to the front of the frame I also have a boom mounted servo

I will post more pics soon


10-06-2007, 07:36 PM
Thanks for looking at it Charley. If you can manage to make it 56mm tall and if it is feasible to use washers/spacers to add 3mm to the width to get to 52mm then that opens up more options, including the possibility of A123 shotgun packs (standing on edge or at an angle) or A123 triangle packs as well as a greater range of lipo combinations. Still won' t help the folks flying 2 x 3s 2200 AT though which would need 60+mm

10-06-2007, 07:58 PM
If you can get the battery bay taller Charlie then I'll be hanging on your web site...56mm would be just fine.