Logo 6003d v-bar stretched

[NTM]

Hi, I've had a few people ask for pics of the my 600 with 690's so here you go :D
I was going to paint the canopy before I took any pics, but I can't see myself finding the time right away. It's tough to see against our current backdrop of snow, but you can't miss that rotor disk !

http://img.photobucket.com/albums/v325/NTM95/IMG_0951.jpg
http://img.photobucket.com/albums/v325/NTM95/IMG_0952.jpg
http://img.photobucket.com/albums/v325/NTM95/IMG_0950.jpg

It's a slightly shortened raptor 90 boom (which fits the frame tighter btw, no slipping boom syndrome) and a gates xl385 belt part #2627mc . Belt construction is neoprene with fiberglass tension reinforcement.

The power setup I'm using is an actro 32-3 max (18 tooth pinion) on a 10s 25c 4350mah flightpower pack through a modified jazz 55-10-32. Ready to fly weight is 7.9 pounds.

I'm only running 11 degrees of pitch and 2000rpm right now, but it does move out quite nicely. You can do some strange looking stuff with it due to the ultra light rotor disk loading, rainbows aren't really an arc, more like just straight across, lol !
It doesn't "pop" quite as hard as it did on 620's with 14 degrees of pitch and 2300rpm, but it seems to move with more authority, it definitally goes from point "a" to point "b" faster.
I felt I couldn't "park" the machine quite as precisely on the 690's as I could on the 600 and 620 blades however.
Cyclic is great though, it's still very quick in response and roll rate, thanks to the v-bar.

The best part is the actro 32-3 "max" barely notices the difference between hard 3d and just basic flight, I've only been flying it 4 minutes at a time (it's cold here !) and it's only pulling 2000-2300mah per flight.

I've only got about 20 flights on it now, so it's by no means a proven setup.
Only real trouble I've had so far were the stock half shanked 4mm bolts bending on the first flight, replaced with some hardened full shank bolts and all is well.
We'll see how the tail belt holds up and if I can get the v-bar 100% dialed in on the 690's though, we need some warmer weather soon !

Regards,
Nathan

[Ticidytoc]

Nice Nathan,

Are you using 3mm or 4mm bolts on the grips?

[NTM]

k&s of japan 4mm, hardened, long shank bolts.
I've heard people mention that the stock 4mm bolts can bend even on 600mm blades.

[Holger Port]

I saw Ulrich Roehr (the Developer of V-Stabi) doing the same with his Logo 600 3D.

He is using V-Stabi, 690 Radix, Joker boom, Actro 32-3, 10S Kokam 4000, Power Jazz (but he said the 55-10-32 shoul also work).

Weight is 3900g. Is runs super quiet and powerful.

Holger

[NTM]

Perfect, I'll have a great source of information for getting the v-bar dialed in !

[rcman]

Were did you get the belt from?

[NTM]

www.sdp-si.com
Part #A 6R 3-385025

[BOOGIE]

Nice!

[Tritan]

NTM, I have tried to get K&S bolts but without luck - where did you get yours?

[NTM]

From a local place here in canada, www.greathobbies.com
I think most full shank bolts will be okay, the stock ones just seem to bend right where the shank stops half way down the bolt.
Plan B was to drill the grips for 5mm bolts, so far these are holding up though.

Regards,
Nathan

[rcman]

www.sdp-si.com
Part #A 6R 3-385025

Thanks for the link

David

[Tritan]

Thanks for the link for the bolts, NTM.

BTW, drilling bigger holes in the grips gives less material in the grips ......

I've made up my mind, just bought a Logo 600 3D yesterday.

[OICU812]

Thanks for the link for the bolts, NTM.

BTW, drilling bigger holes in the grips gives less material in the grips ......

I've made up my mind, just bought a Logo 600 3D yesterday.


Congrats, you will have no regrets, best big e-heli money can buy imho. :D

[Tritan]

Thanks Shawn!
Now I'm counting the days until it arrives.
How long flight time can I expect on non 3D flying, 10S & 3700mAh?



Logo 600 3D, 45-7, 55-32-10, BLS251-451

[OICU812]

With the stuff you have in your signature,,, likley 5-7 minutes, I really do not know how you fly. So.... first 4 flights when breaking in packs simply fly much shorter times, say 4 minutes tops and measure how much you take out. Stay 80% or under and you are golden. :wink:

[Daniel Jetschin]

Also to be considered the new Evo Lite from FP, about the same cost as 4350 pack but its 5350 ! Today I've got 9:35 out of it flying mixed 3D w/ high and lower rpms. And it's just 70 grams heavier.

[eltavito]

Daniel,
What motor and ESC were you using with the 5350 Evolites?


Occy

[NTM]

A couple pics from today.
I'm still not sure about the 690's, it's really light on it's feet, almost too light.
Tends to move around a little too much when you're flying low and hard. I'm not sure if it's just the v-bar needing more tweaking or if the rotor disk loading is actually too light.

http://img.photobucket.com/albums/v325/NTM95/IMG_1036.jpg
http://img.photobucket.com/albums/v325/NTM95/IMG_1002.jpg
http://img.photobucket.com/albums/v325/NTM95/IMG_1025.jpg
http://img.photobucket.com/albums/v325/NTM95/IMG_1059.jpg

Regards,
Nathan

[Daniel Jetschin]

Hi

Just used my regular setup, 24-4, 19T, power Jazz. Headspeed max. 2250, low 1900.
I use to get more HS but it was quite cold..

Dan

[Ticidytoc]

Sounds like that may be the pack for you Nathan with those 690's. Personally I like how the Logo 600 feels with 3300/3700 packs, seems to float better. The 5350's feel a bit "heavy" for my tastes, but the long flights are nice.

[Adam Turner]

Remember you are using the quickest blade on the market, those 690 Rototecks are bad ass fast, you usualy need 40g paddles to tame those beasts. hehe.
I would probably recommend shooting up the stability (paddle weight) on the vbar to 120 and increase the hiller by 3or4. that should give the heli some presents in the air and not feel so twitchy. but of corse you still have about the same roll rate.

I would also recommend adding weight either by using higher capacity batteries or maybe some heaver components. And decrease the head speed to 1900, this aint no 50 anymore.

I hope to be doing the same sort of conversion with 690 V's soon. I will be using NEU 1915 1Y on 11S 4900-5000mAh Flight power packs. I will post up when it gets done. (not soon with this weather. Good old England)
Hope this helps
Ads

[NTM]

Thanks for the reply Adam, I've literally got this thing sitting in front of me right now with the stock boom and belt ready to go back on. I can't bring myself to do it though, the crazy lift it has is just too much fun !

The problem isn't so much that it's twitchy (it's not at all actually, the cyclic response and speed is great), it's that even while the heli's attitude remains rock solid in a maneuver like a rainbow, it'll drift a little one way or the other on hard, or even softer, stops. I just have less confidence in being able to "park" the heli exactly where I want it.
I never thought it would be possible to have too low of a rotor disk loading but it's starting to look like it's happening.
Daniel Jetschin can likely elaborate on this more as he's probably got more time on a stretched 6003d than anyone else, I'd love to hear your opinion on the matter Daniel.



Also Adam, I could add more weight to the machine with more battery etc., but if I do that I might as well just go back to 620mm blades and use my existing components to achieve the same rotor disk loading and power to weight ratio as I'd have on the 690's with the extra stuff.

I actually tried my 1915-1y on these 690's, the actro 32-3 has quite a bit more grunt.
I've also tried my 1915 on 12s and it runs very hot.
The 1915 has lower average current draw but peaks higher, good motor for mixed flying. The 32-3 is my hands down choice for hard 3d though, and it runs cooler.

I can't really decide what to do with this thing right now, the absurd thrust to weight ratio makes me giggle every time I fly it, but then I'm dissapointed once I start into really close to the ground tight stuff, because the precision isn't there.
Perhaps dialing down the head speed will help ?
Further v-bar tweaks ?

Another problem I'm having is that the fiberglass reinforced neoprene belt I'm using has to be very tight or it'll skip during hard reversing piro's. Wish I could find a urethane one that was long enough.

Regards,
Nathan

[bladebraker]

I wounder if this belt would work? http://www.gohbee.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=10294&Category_Code=1430

[Flybar-less]

The GoBee 90 belt is a neoprene 720XL of unknown origin. Several of us in static prone areas use them with 620 blades.

[Daniel Jetschin]

I've flown a stretch 600 and in fact it's too light. In my opinion a 90 size lighter than 4.5 kilos is total BS coz you can't use it properly. Maybe 4.8 is what you're looking for. Imagine even if an Aurora or something weights 4700 less fuel you still get it over 5000 RTF. It's just necessary to make it sit on those long blades. I doubt that a stretch logo on that weight will run reliable anymore, imagine the force twisting this 10mm oneway a.E. Better to stick with the 600 and 600 blades IMO :)

Dan