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HomeAircraftHelicopterAlignT-REX 700N › Quick question about FBL mainshaft for 700 Nitro
05-10-2011 06:22 AM  7 years agoPost 1
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Did you run the shorter FBL mainshaft (H70035) on your 700N, or the stock main shaft?

Are the FBL links designed (measured...) for the stock main shaft, or specifically for the shorter FBL main shaft???

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05-10-2011 06:41 AM  7 years agoPost 2
Rockohaulic

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Can I run my stock Elevator "A" arm with the shorter main shaft???

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05-10-2011 09:48 AM  7 years agoPost 3
Paul Woodcock

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Hi

You can use the shorter main shaft on the nitro machine. There are shorter FBL pushrods, but the longer ones can just be threaded in more. Both the FBL rods are thicker than the FB rods.

The A arm on the electric model is shorter than on the nitro.

The bell cranks on the electric have the option of moving the vertical pushrod closer to the bearing. This is better for FBL. You will still need to move the balls on the servo wheels in.... even with the e-bell cranks.

So you end up using the nitro A arm and the electric centre bell crank, and the 2 outer electric bell cranks.

Regards
Paul

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05-10-2011 04:45 PM  7 years agoPost 4
Rockohaulic

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The A arm on the electric model is shorter than on the nitro.
But you don't need it to center the swash properly with the shorter main shaft???

Saturday morning I flew my helicopter in my pajamas
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05-10-2011 05:29 PM  7 years agoPost 5
HeliWholesaler

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Billings, MT

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You will ideally want the shorter A-arm so that your geometry is correct. Otherwise your swash will be a bit off and it will need to be corrected.

www.HeliWholesaler.com

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05-10-2011 06:17 PM  7 years agoPost 6
sluggo

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Kitchener Ont

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NO you do not use the shorter A arm. All you use the the ele bell crank with the stock nitro A arm. All you are doing with the short shaft is lowering the head 9mm. You will need the shorter links from the swash to the main grips. The stock ones will work but you will endup stressing the plastic links by threading them in that far.

Then add the ala and pitch bell cranks from the 700E using the inner hole on all 3 bell cranks. The only diff will be the stock washout arms will now be up tight on the head block insted of 9 to 10mm lower.

Teambob00

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05-10-2011 06:40 PM  7 years agoPost 7
Paul Woodcock

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Hi Guys

I concur with sluggo.....

Regards
Paul

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05-10-2011 07:12 PM  7 years agoPost 8
Rockohaulic

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Hi Sluggo
Then add the ala and pitch bell cranks from the 700E using the inner hole on all 3 bell cranks. The only diff will be the stock washout arms will now be up tight on the head block insted of 9 to 10mm lower.
So do you have a picture of this???

Or better yet - a before (long main shaft) /after (short main shaft) picture of it???

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05-10-2011 07:51 PM  7 years agoPost 9
HeliWholesaler

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Billings, MT

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You will also notice that on the 700E Elevator A-Arm includes longer balls to correct geometry for your ELV servo. You SHOULD run the H70046 (700E) A-Arm IF you are running the shorter main shaft. This option will need the shorter links.

If you are running the stock 700N main shaft then you SHOULD continue to run the stock 700N Elevator A-Arm HN7033QFT. Here you can use the longer links.

www.HeliWholesaler.com

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05-10-2011 08:37 PM  7 years agoPost 10
sluggo

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Kitchener Ont

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Why would you run the short Aram with the short shaft?? Nothing from the swash down is changing. Only from the washout up is changing.

Teambob00

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05-10-2011 08:45 PM  7 years agoPost 11
HeliWholesaler

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Billings, MT

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If you don't use the shorter a-arm your geometry will be off giving you an uneven swash.

www.HeliWholesaler.com

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05-10-2011 09:26 PM  7 years agoPost 12
sluggo

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Kitchener Ont

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Why??? nothing from the bellcranks up to the swash changes or even from the washout down changes. So please tell me how geometry will change???

After installing the short main shaft the ONLY thing that will change is the rods that go from the grip links to the swash plate.

Rock I do not have pics with the short shaft but I do have pics with the long shaft in my gallery. Also if you are switching to fbl from a fb kit you will want to make sure you have short balls on the swash where the links from the grips attach. Stock fb kits come with 4 long balls on the inner ring of the swash.

Teambob00

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05-10-2011 09:37 PM  7 years agoPost 13
HeliWholesaler

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Billings, MT

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You do realize that using a short main shaft means that the swash will have to drop?

One set on links are not adjustable so with that in mind, you should use the shorter a-arm.

It's not mandatory and could be mixed out but if you want you geometry to be correct then I would suggest using the shorter a-arm.

www.HeliWholesaler.com

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05-10-2011 11:15 PM  7 years agoPost 14
Rockohaulic

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Gentlemen, I think we are quibbling over semantics...

Unless I am really confused, the Elev "A" arm & Bellcrank are combined in one assembly. So If I buy the 700E Elev Bellcrank, I end up with the Elev "A" arm too.

Are you saying that the distance from the pivot point to the "A" arm on the 700E bellcrank portion is SHORTER than the 700N bellcrank portion?

If not, then you are not gaining anything by going to the 700E part. In fact, if that distance is not shorter, then I do not see the advantage of going to the 700E Ail bell cranks and using the inner holes because your geometry would be off.

Did anyone follow that logic???

Elev "A" Arm and Elev Bell Crank
http://www.heliwholesaler.com/H7004...uctinfo/H70046/

Side Aileron Bell Cranks
http://www.heliwholesaler.com/HN703...tinfo/HN7034BA/

Sheesh - I think I'm confused again...

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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05-10-2011 11:19 PM  7 years agoPost 15
HeliWholesaler

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Billings, MT

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Exactly my point Rock.

Thanks.

www.HeliWholesaler.com

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05-10-2011 11:57 PM  7 years agoPost 16
sluggo

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Kitchener Ont

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Rock yes the 700E pivot point is shorter then the 700n unit. Now with the ele and ali and pitch bell cranks installed you end up the innner hole on all 3. This will give more servo Resolution.

Now the 700e comes with a shorter A arm because the geometry of the 700e is different. It is not needed when running the short shaft on the 700n. Nothing from the bell cranks to the swash is changing with the short shaft. The only thing different is the length of the links from the swash to the blade grips.

Teambob00

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05-11-2011 12:43 AM  7 years agoPost 17
Dino Spadaccini

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USA

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i have the popcorn ready on this one

RIP Roman JR
Capt USA Align Factory Team Align - Conquer Your heart
Team Futaba

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05-11-2011 01:11 AM  7 years agoPost 18
sluggo

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Kitchener Ont

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You know I am right already as you have a 700 setup with short shaft and 700e bellcranks

Teambob00

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05-11-2011 01:28 AM  7 years agoPost 19
sluggo

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Kitchener Ont

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05-11-2011 01:54 AM  7 years agoPost 20
Kevin Dalrymple

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Indianapolis

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You do realize that using a short main shaft means that the swash will have to drop?
A bunch of us here on RR have been running this set up for awhile now. You do not use the short "A" arm as it is too short for a 700N. The ELE arm pivot is closer to the swash in the 700E that is why the there is a shorter "A" arm for the 700E.

You do not drop the swash in the 700N when switching to the shorter main shaft. All you are doing is lowering the head block by 8-9mm. You will need shoter links go to the blade grips that is all.

As far as the new ALE and ELE levers, people are using this to get more resolution as they have an extra set of inner holes. I am running this set up now on my 700N with the Futaba 750 and i am running the short balls on the swash and the inner holes on the servo arms. The new arms are not needed for most FBL systems. You don't need it for the Total G, 3G, Futaba 750, and Vbar. I have run all these systems on my 700N with out the levers and they fly great with out them. The new arms are just something to play with.

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