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AJ Acuity 2M Build

Old 03-10-2020, 06:04 AM
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lc_eiras
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Default AJ Acuity 2M Build

Hi

After the "mid-air" collision with a trainer in the beginning of the year , I lost my Bjcraft Nuance.

I loved that plane!!!!! It was old but flew straight and it was very competitive.

No plane for me to 2020 Portuguese Championship and the FAI F3A EUROPEAN CHAMPIONSHIP in Zamora ( If Covit-19 allowed )




Since the budget is not high, I decided to explore all possibilities. After some research and contacts (Thanks Shulman) I decided to go with AJ Acuity . One call to https://aerobertics.be/ and the plane arrived today. (Great service, thanks for everything)

I will start the assembly tonight and try to put all the useful information I can, from what I have seen, I will not make any major changes / upgrades.

Equipment:

AXI 5325/24 GOLD LINE V2
SPIN 99 PRO OPTO
2 x Graupner Mini servo DES 658 BB, MG (Elevator)
2 x Futaba Servo S9550 Digital Low Profile (Aileron)
1 x Futaba Servo BLS 351 (Rudder)
Jeti Receiver



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Old 03-10-2020, 04:39 PM
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lc_eiras
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Default Some weights:




















Last edited by lc_eiras; 03-10-2020 at 04:51 PM.
Old 03-10-2020, 04:57 PM
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Default Engine Mount






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Old 03-11-2020, 12:10 AM
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Frédéric Garnier
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Hi
Do you have a difference of 100 grams on the wings ?

Fred
Old 03-11-2020, 02:38 AM
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Originally Posted by Frédéric Garnier View Post
Hi
Do you have a difference of 100 grams on the wings ?

Fred
Hi Fred,

Yesterday, it seemed strange to me, too. But this morning I confirmed it and it's okay.
Right Wing - 283g
Left Wing - 286g

//Luis



Last edited by lc_eiras; 03-11-2020 at 03:00 AM.
Old 03-11-2020, 02:58 AM
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I have to find shortest spacers. About 7mm to make sure there is not a big gap between the spinner back plate and the front of the cowl.

The wood ones supplied in the kit are not all the same size.

For the Axi installation, the ideal size will be 13 or 14mm spacers.



Old 03-11-2020, 05:37 PM
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Do not tighten too tight, the aluminum piece will break. Probably that's the reason there's three in the kit.





The fit of the Wheel Pants with the landing gear is excellent


Engine Mount with 2 x .5mm and 2 x .3mm Brass washers



Rudder Servo Installation

Last edited by lc_eiras; 03-12-2020 at 09:04 AM.
Old 03-11-2020, 05:48 PM
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it's starting to look like an airplane



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Old 03-12-2020, 04:52 PM
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I’ve never seen a rudder servo wheel like that used on a pull pull
How does it work and who makes it?
Old 03-13-2020, 02:55 AM
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Originally Posted by ltc View Post
I’ve never seen a rudder servo wheel like that used on a pull pull
How does it work and who makes it?
Hi Itc

The advantages of this type of installation are:
  1. If installed correctly you get an equal tension on both sides of the installation (works with a single cable opposite one to the left and the other to the right).
  2. More linear rudder movement with benefits in centering.
  3. Less servo force (resulting from distributed tension).
But with a normal servo arm it still works!!!!!!

You can find it in here:

https://www.probuild-uk.co.uk/index....roduct_id=4147
https://www.ebay.co.uk/c/1052995784
https://www.gravesrc.com/hangar-9-pu...air-large.html



Old 03-14-2020, 07:49 AM
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Hello lc

You must have the same wheel in the rudder (as shown on pictures) to get the advantages of this type of installation.




Last edited by papaone; 03-14-2020 at 11:42 AM.
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Old 03-14-2020, 09:31 AM
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In rudder assembly, I replaced the 1mm wire for 1.45mm, seemed to me it had less slack on the hinges.
If inecessary it's still possible to remove the Rudder.
Also change the tail wheel.








Old 03-14-2020, 09:45 AM
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Does anyone know where is the model CG?
Old 03-14-2020, 10:16 AM
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Default Acuity CG

Originally Posted by lc_eiras View Post
Does anyone know where is the model CG?

For me this is where I liked the cg. About 9mm behind the cross former. Here is a picture of mine.
Please note this is without the canopy on.

Andrew

Old 03-14-2020, 10:50 AM
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Originally Posted by flyboy91 View Post
For me this is where I liked the cg. About 9mm behind the cross former. Here is a picture of mine.
Please note this is without the canopy on.

Andrew
Thanks Andrew, I'll follow your lead on the GC.
Old 03-14-2020, 10:53 AM
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I couldn't believe when I put the incident meter on the wings
Amazing how a plane with this kind of construction comes out of the box so straight.
The fit is also perfect !!!!!!




Old 03-14-2020, 11:57 AM
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We spent a lot of time to tell the factory how important weight was as well as incidence.
Old 03-15-2020, 10:24 AM
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Old 03-26-2020, 03:04 AM
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Time to reinforce some areas of the fuselage:




Old 03-26-2020, 03:10 AM
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Old 03-27-2020, 06:08 AM
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Fixing the Rudder Wire:

Old 03-27-2020, 06:16 AM
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Smile

Elevator halfs alignment:

This was a time-consuming but fundamental task to ensure a level flight and the correct entry into the manoeuvres.
Since the stabilizers have no reference at the ends, a template similar to the one in the photograph should be provided to ensure its correct alignment.
Something to consider as an update to the Kit !!!!!!



It should not be difficult to produce and the cost is insignificant verses the advantages it offers .


It is true that the tuning of these elevators is only achieved after the trimming flights.But starting from a solid base guarantees better results.
I have chosen to go this way:




In the end I confirmed everything with the incident meter.

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