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HelicopterAlignT-REX 700N › T700 "Heli-Chris" Electric build thread.
12-10-2008 05:47 PM  9 years agoPost 41
MrMel

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Gotland

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First hover was uneventful, perfect still hovering in my frontyard

Gonna see tomorrow how it holds up when I throw it in hard 3D with freezing temps... That if weather gods dont decide on rain or snow..
(in the few hours daylight we currently have)

I need to move to a warmer climate.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-10-2008 11:17 PM  9 years agoPost 42
MrMel

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Gotland

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Last piece of equipment which I had forgot to install is now installed, so the bird is ready for a real flight.

(2 x LipoDiMatic in series, so I can skip the timer)

Also added the second cable from the Jive to the RX for load balancing the BEC power over two cables, specially important since the cables on the LiPoDiMatic is quite long.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-11-2008 12:11 PM  9 years agoPost 43
MrMel

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Gotland

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not very sucessful

was out trying it today but got a severe wobble as soon as I hit idle-up, like a bent spindle or something, however thats new so thats not the case, probably gonna put on a modded original head to see how it flies.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-11-2008 01:35 PM  9 years agoPost 44
F1 Rocket

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Melbourne, Florida USA

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Was this a fast side to side shake? Mine does that with the stock (flybar) head at certain speeds.

Danny

Danny - DemonAero Support Team

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12-11-2008 01:46 PM  9 years agoPost 45
MrMel

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Gotland

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Like some holding the head and shaking the whole heli, alot, more RPM = more shaking.

Must be the spindle or dampers or someting with it, gonna put on my other FBL head and see...

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-11-2008 07:41 PM  9 years agoPost 46
duke666

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Hampshire, UK

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I see you ended with 4690 all up weight, any idea what a nitro 700 weighs in at with fuel on board?

Duke

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12-11-2008 09:18 PM  9 years agoPost 47
MrMel

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Gotland

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My nitro comes in around 5100gram fully fueled.

T700N - VBar
YS91SR - Hatori SB-19FH
8717, BLS251, 9252
ReactorX
SwitchGlo
2s1p 4200 mission cells flightpack.
ATGv3 Gov.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-11-2008 11:56 PM  9 years agoPost 48
Anthony.L

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Seattle, WA

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Looks like we are going to have a US dealer pretty soon for this conversion kit. Which is great since I'm seriously looking at building a 700E based on this kit next summer.

http://www.espritmodel.com/index.as...n=Custom&ID=102

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12-12-2008 03:11 AM  9 years agoPost 49
Taipan

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Sydney, Australia

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Great pics. I don't like the fact you have to CA the frames together! What if you break one part, not so easy to replace??

Also don't like how the canopy is mounted, it is pointed down, not flat like on the original frames!

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12-12-2008 05:14 AM  9 years agoPost 50
MrMel

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Gotland

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CA the frames?? No you dont CA the frames, you snap them together.
(just like all other CF helis, Like the Logo 14 etc)

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-12-2008 06:16 AM  9 years agoPost 51
duke666

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Hampshire, UK

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I must be missing something, who said they had CA'd the frames?

Also, to me from all the pictures here the canopy looks as normal, it certainly is on the heli-chris frames I have here!

Duke

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12-12-2008 12:34 PM  9 years agoPost 52
MrMel

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Gotland

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Canopy does indeed point down a little compared to the nitro, I dont care.

My wibbly-wobbly heli was because of a bent mainshaft (new bonta..), gonna slap on a original head instead, modded for FBL.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-12-2008 01:01 PM  9 years agoPost 53
Taipan

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Sydney, Australia

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Ah, well I never had a Logo 14 so never built those kind of frames. Hey, what about the 3DMP XLE? A chap here built one & it uses similar construction but dunno if he used CA.

That's good if you dont use CA for the Heli-Chris frames!

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12-15-2008 09:30 AM  9 years agoPost 54
OICU812

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Edson, Alberta, Canada

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Very interesting Fredrik, really look forward to hearing about this indeed!

...Once upon a time there were Nitros, flybars and frequency pins...

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12-16-2008 12:05 PM  9 years agoPost 55
Taipan

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Sydney, Australia

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Isn't it tail heavy with the servo on the boom?

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12-16-2008 12:10 PM  9 years agoPost 56
MrMel

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Gotland

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Isn't it tail heavy with the servo on the boom?
Nope, in my case it was actually the opposite, If I had stayed with the original layout it had been way nose heavy with the packs I use.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-17-2008 10:29 AM  9 years agoPost 57
MrMel

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Gotland

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Finally test-flown

Sorry guys, didnt get a video today, was alone at the field.
but I finally got a chance to really put it down for a test.

Here is my last few "Likes/Dislikes" (not including those earlier discussed in the thread)

Likes:

- Power to weight ratio, you can feel in the air its light, but still heavy enough so its not bobbing around, nice.
- Rigid, whole setup is very rigid, you can feel it in the air as well.

Dislikes:
- User-friendliness, Im spoiled with my E-stratus & E-Aurora perhaps, but putting the pack in & securing it is a pain in the... If he had done some minor changes to the frame it wouldnt have been that bad, but since all sections in the frame around the pack go diagonal its basically "sewing" to get the straps in there.

- I would had done a adjustable bottom plate so you could raise it for higher CoG if you have clearance with your packs, I will perhaps mod this sometime in the future.

- ESC mounting, I had to remove my ESC and boy was that fun, not.

- Low main to tail gear ratio, but thats aligns fault, not the E-conversion.

Question for you other people running it "stock", do you have CoG corrently in the dead center under the shaft, I have like I wrote earlier, but the more I think about it, with stock setup, it wont be(?)

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-17-2008 11:46 AM  9 years agoPost 58
Taipan

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Sydney, Australia

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That's interesting yours isn't tail heavy! Did you have to slide the packs forward much?

The static CG on mine with stock frames is directly under the main shaft. However it has trim issues, no matter what, it always needs 4 clicks of forward cyclic for a level hover. This makes it 'tail heavy' when hovering inverted and doing backward Hurricanes.

The F3C guys here were talking about CG. They were saying that even with a perfect static CG, it can appear 'tail heavy' in the hover due to the downdraft on the horizontal fin. They compensate for this by having a slightly nose heavy static CG. I'm thinking the downdraft is pushing down the boom on my heli even without a horizontal fin. Will try moving my front lipo foward a bit.

I wish my 700E was as light as yours and am only using 12S 4200mah! It's 5.05kg which is 350g heavier than yours. I see you saved about 150g by going flybarless and 100g by not using a Rx lipo. The last 100g would be the frames I guess. A 4.5-4.7kg 700E on 12S 5000mAh for even 5min on flybar would be sweet!

Btw a LHS here just got stock of painted Canomod 700N canopies. Site says 60g each! Can't be that light but would save 100g vs using stock canopy.

Ditto, it's a pain to swap out lipos in my heli. Takes longer than the flight time to do so! It puts me off flying it heaps in one day.

How is the low tail ratio a problem?

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12-17-2008 11:48 AM  9 years agoPost 59
MrMel

rrProfessor

Gotland

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That's interesting yours isn't tail heavy! Did you have to slide the packs forward much?
Not at all, actually more towards the tail, hence my questions to others with this frame.
How is the low tail ratio a problem?
Poor piro consistency & poor performance at autos.

With vbar its important to get the CoG center shaft, it flies alot better that way, any drifting the gyro will handle, so that wont happen.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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12-17-2008 03:17 PM  9 years agoPost 60
F1 Rocket

rrKey Veteran

Melbourne, Florida USA

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Likes:

- Power to weight ratio, you can feel in the air its light, but still heavy enough so its not bobbing around, nice.
- Rigid, whole setup is very rigid, you can feel it in the air as well.

Dislikes:
- User-friendliness, Im spoiled with my E-stratus & E-Aurora perhaps, but putting the pack in & securing it is a pain in the... If he had done some minor changes to the frame it wouldnt have been that bad, but since all sections in the frame around the pack go diagonal its basically "sewing" to get the straps in there.

- I would had done a adjustable bottom plate so you could raise it for higher CoG if you have clearance with your packs, I will perhaps mod this sometime in the future.

- ESC mounting, I had to remove my ESC and boy was that fun, not.

- Low main to tail gear ratio, but thats aligns fault, not the E-conversion.
I find the pack/packs are very easy to change. My packs are 10s stick packs and 5s bricks that I made into a stick configuration by heat shrinking them on to a G-10 plate. This lets me slide the pack in from the rear so there is no need to remove the canopy. This feature alone (almost) make the cost of the frame set worth it. I did not use the plastic rails that came with the frame set. I have velcro on the bottom plate and use only two straps in the center area of the frame. Very quick and easy.

IMHO the stock ESC location is a pain so I moved mine to the rear. Very easy to service and stays very cool.

Danny

Danny - DemonAero Support Team

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HelicopterAlignT-REX 700N › T700 "Heli-Chris" Electric build thread.
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