Stretching a 600, few questions

[helicraze]

I am thinking of stretching a 600 3D to take 690MM rotors.
Aside from the following below is there any thing else to consider/do?

Buy longer boom
Buy longer belt
Buy 690MM rotors

Will the hard dampers be ok? Will it still be ok at 2300RPM headspeed? Will 8KG torque servos be ok?
I want to stretch one and use the 32-3 motor so it can push those big 690MM rotors.
Do people stretch them for stability or just to ultilise power?

[OICU812]

You will need a longer cf pushrod of course, and if you care to keep it looking in proportion you would then want to consider making some longer boom supports as well. As far as Headspeed once you have that big of a disc you will not need near the headspeed to acheive lift, in fact I am betting at the weight of the 600 stretched you would not need to ever exceed 2100 rpm at most and only would need 13/13 tops of pitch if that. Reason why some people might stretch it, "cause they can..." no other real answer, each person has their own reasons....:)

[OICU812]

Yes hard dampers would be fine BTW, you can consider running two of the thin shims in between the grip bearings and dampers to stiffen it up better to support the larger blades, this will have no ill effect. Lastly with the 32-3 you would need to run 17 or 18tooth tops pinion to be in range for a 90 ship. Oh... as far as servos, I beleive in buying/using the fastest best you can get, 8717s' are fantastic for having tons of tourque and being robust and fast. ;)

[helicraze]

thanks for the info, will it get me any more power or will the 32-3 with 600MM still boogie?

[OICU812]

its not really a comparison of power, its disc loading. on 600mm it will be fine, you see any of last years Ircha videos with Daniel J with 32-3 on 600m?? They're crazy.....:YeaBaby:


http://video.helifreak.com/?subpath=IRCHA2007&filename=DanielJetschinFri-IRCHA07.wmv


That is on 600mm mains, Acxtro 32-3 with 19tooth mod.7.

[helicraze]

sigh, so many choices! Thanks for your input, lots of things to think about :)

[helicraze]

Alright i have been reading up a bit more on stretching a logo.

One question, can't it accept 690MM rotors with the standard boom etc?
Looking at the logo 500 it was designed for upto 530M rotors (i think) people run 560MM rotors and there looks to be overlap between the main rotors and tail rotors.
I measured it out on the 600 and the overlap looks to be about the same with 690MM as the logo 500 with 560MM.
Please give me your advice fellow freaks

[worldofmaya]

Have a look at that video: http://www.uroehr.de/videos/uli_logo700.wmv
-klaus

[helicraze]

ok thanks but that didn't really help answer my question.
I think i might just get another 600 kit and build from scratch

[Stefan Hornstein]

Hi,

i also want to stretch my Logo. Why? Because I'm already flying a 90 size electric and I've got a Roxxter 22 and the L600, these are too much different sizes for me. The Roxxter (500 size) is neat for funflying behind the house. And of course with the Logo you can do what you want (even compete at 3D Masters). It's a capable machine. But for me the 90s fly best. "So if it's possible" I thought, let's make a Logo 700.

I ordered a 788XL belt (distributed by Mikado!) and ordered a Aluminum 25mm tail boom at Vario Helicopters (900+ mm).As far as I know the length has to be 830mm. Then I can use up to 710 Blades.
Of course you will need a longer tail pushrod. A 4mm CF-Tube will do it. This is what I know from Ulrich Roehrs conversion...
And if you've seen the Videos, you will agree that at least it seems to work...

I've often read that this machine's to light for a 700 size and that it's not flying in a clean manner but I want to see this myself. From the Videos it does really look very smooth.

I will fly 2 teeth down on the pinion. Had a 15 tooth, will now use a 13 tooth. In my opinion, 1750 headspeed is really enough for a 90 size electric! Maximum 1900, but that's burning air. I don't understand why you all recommend flying over 2000... That's a good headspeed for a 30 to 50 Size electric...

I hope my conversion is finished next week. Then I can report back...

Bye

[Stefan Hornstein]

Oh,

that's what I've forgotten:

The Standard 600 3D will take up to 650 Blades, the 600 DX is only for 620s as far as I know!

[helicraze]

One more thing is 2100RPM too much for 90 size?

[OICU812]

I am running my stretch 7003D at around 1975 rpm, with 690s it really has alot of pop. I am running Actro 32-3 with 17tooth on 10S.

[helicraze]

Do you know if the Z50A motor will handle 690MM rotors on 10S?

[OICU812]

No it will not, it will get to hot. The Actro 32-3 or the new Scorpion 4035-560kv motor would be optimum for larger disc.

[helicraze]

Can you please describe the flight characteristics of the streched heli? I am tempted as i retire another heli and use most of the electronics from it and make a logo 700 for about $1000-1200. I was going to use 12S 5000MAH.
I really like fast climbouts and big fast rainbows etc, just raw silly power.

[OICU812]

well if you are using 12S then ok but you don't need 12S , mine is 10S and more than ampo amount of power to say the least. FLying characteristics... hmmm well it is very agile with Vbar I can say that, as tight flying and nimble as my 600s are but yet very very smooth in transitions and has huge presence of course. :)

Here is a video of Ulrich, the creator of Vstabi and his Vstabi 7003D. I assume you are going Vstabi or flybar ?? Right click and save as.

http://www.uroehr.de/videos/uli_logo700.wmv

[OICU812]

Here is a pic of the one I just converted that was a 6003D.

[helicraze]

mmmmm looks nice. I will go flybar. I can go 10S setup, i guess it doesn't really matter as i have 10/12S packs (5 and 6S) quite a few.
I was just reading that anyone that streches was saying it feels to"floaty" and needs more weight.

[OICU812]

I run a 10S 5350mah pack, it feels pretty dam good to me. :cheers

[uragano47812]

Hey Shawn can you do a list of the parts needed to convert to 7003D?

I see on mikado's site that they sell the belt but not the boom. other parts?

And 690mm or 710mm Blades?

Will CC85HV do the job on 12s 4000 or 5000mah?

I will buy the new scorpion motor 4035 ok?

[Stefan Hornstein]

Hi,

you can get a 25x900mm boom from Vario Helicopters. Cut it down to 830mm. With the Mikado 788XL belt the Heli can swing up to 710mm Blades.

For pushrod you can also get there a 4mm-Carbon rod - 1 metre long. Also cut it down to the desired length and glue some M2,5 threaded rod in from both ends. Just how it's done with the stock Logo 600 3D pushrod.

Don't forget to use the new carbon belt tensioner (4175) to prevent belt slipping.


I maidened my L700 last weekend. All I can say is WOW. I'm using Maniac 703 Blades, 10s 4000 Kokam 30c, Jazz 55, Tango 45-6 with 13tooth pinion. Flybarless with AC3x.

Flying with 1700 rpm the machine is super quiet. You can just hear the deep flapping of the huge blades. With 1900 it get's super crisp and responsive. But for me i like 1700 much more.

By the way, I don't think that 12s Lipos will fit! It's already very tight fit with my 10s 4000s.
I was surprised how well the "small" Tango Motor performed.It was slightly too hot after 6 minutes flying, but the power was OK. I will get some Actro 32-3 later. But then also 10s will be enough, imho. The Heli has 3,8Kg at the moment. The Actro will have an easy job with this. 12s would be insane...

Ciao Stefan

[Tritan]

What tail blades are you using here for the 700?

[Stefan Hornstein]

Hi,

I'm flying GCT X-Tail 95mm.

[uragano47812]

Readyheli has the 788XL belt and will carry as soon as possible also the required boom!!