Zlin EP - What is the CG?

Zlin EP - What is the CG?
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Zlin EP - What is the CG? - 2/24/2008 2:01:13 AM

mtstopa

Posts: 9
Joined: 12/8/2007
From: Foxboro, MA, USA
Status: offline

I have a Zlin EP - the website and the directions provide the following information but does NOT give the designed CG location. I have emailed multiple times and called, but no one has been able to provide me with the information. PLEASE HELP - I would rather not 'guess' as to the CG location.

Specifications:
Wing Span : 40 in / 1016 mm
Wing Area : 430 sq in / 28 sq.dm
Flying Weight : 45oz / 1300g
Fuselage Length : 31 in / 800 mm

Requirements:
Li - poly : 11.1V ; 1800-2200mah ; Propeller :9"x 6" ;
Out ranner Brushless Motor : 450T Speed ; Control:45AMP.

Post #: 1

RE: Zlin EP - What is the CG? - 2/26/2008 6:13:16 AM

nitrostaff1

Posts: 591
Joined: 10/20/2006
From: LA, CA, USA
Status: offline

I'll get back to you on this one. It's not on the manual. Contacted the manufacturer.

John
Nitro Planes

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Post #: 2

RE: Zlin EP - What is the CG? - 2/27/2008 11:13:13 AM

nitrostaff1

Posts: 591
Joined: 10/20/2006
From: LA, CA, USA
Status: offline

CG is is 58mm/2.28in from leading edge.

John
Nitro Planes

quote:

ORIGINAL: mtstopa

I have a Zlin EP - the website and the directions provide the following information but does NOT give the designed CG location. I have emailed multiple times and called, but no one has been able to provide me with the information. PLEASE HELP - I would rather not 'guess' as to the CG location.

Specifications:
Wing Span : 40 in / 1016 mm
Wing Area : 430 sq in / 28 sq.dm
Flying Weight : 45oz / 1300g
Fuselage Length : 31 in / 800 mm

Requirements:
Li - poly : 11.1V ; 1800-2200mah ; Propeller :9"x 6" ;
Out ranner Brushless Motor : 450T Speed ; Control:45AMP.

_____________________________

--===www.nitroplanes.com===----

(in reply to mtstopa)

Post #: 3

RE: Zlin EP - What is the CG? - 2/27/2008 12:56:59 PM

mtstopa

Posts: 9
Joined: 12/8/2007
From: Foxboro, MA, USA
Status: offline

Thanks for the information - I had attempted to figure out the appropriate CG using a couple of different CG Calculators/Formulas. What I came up with was close to that, though if I had used that CG I would have likely been a few mm nose heavy (not necessarily a bad thing).

While on the subject of the Zlin - the manual says that the flying weight is 45 OZ - that is WAY off. Mine, completed, is 21.2 oz (w/o battery) and 27.25 oz with a 3S 2250 mAh lipo.

You might want to consider updating the website and including a correction with the model. I would guess that most people would appreciate having the correct information as they plan for what power to install. I found it a little confusing as the motor mount restrict your brushless motor selection to no more than 29 mm in diameter - making it nearly impossible to have sufficient power if your figuring on a 45 oz plane. Even at 27.25 oz it is difficult to find sufficient power for the aerobatics the plane is capable of.

(in reply to nitrostaff1)

Post #: 4

RE: Zlin EP - What is the CG? - 3/10/2008 8:51:33 PM

Evgeny-arm

Posts: 96
Joined: 1/20/2005
From: Krasnoyarsk, RUSSIA
Status: offline

First time I bought model not having the information that I buy. On a site except for two muffled pictures which do not speak about a design, anything is not present. When there has arrived the plane I simply long looked and very long thought, looking at contents of a box and could not understand in any way where it is possible to put in this design 45 oz. Weight of my plane assembled, but without the motor and the equipment and aerodynamic panels of wheels = 360 gram 12,7 oz. I think that 23 oz the weight for flight will turn out. Thanks for a question and the answer here about finding CG.
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I for the first time see such attitude to that that sell. The plane is very well made. The first plane from Nitro Planes which has given me pleasure from the small list before bought at this seller. Bought the plane being guided absolutely on other purposes (characteristics data on a site which and Have brought to a choice are guilty). I search for the plane for conversion on OC 30-FS. This model does not approach for this purpose. But it is fine for электро as well as was projected.
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Beautiful, interesting model. I can be mistaken, but if the seller has told more about this model, interest of buyers would be high.
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I have Zlin Z-50 Engine 46~52 - 56 " and it is made much worse and not accurately in difference from this kid.

< Message edited by Evgeny-arm -- 3/10/2008 8:54:34 PM >

(in reply to nitrostaff1)

Post #: 5

RE: Zlin EP - What is the CG? - 3/12/2008 3:11:10 AM

Evgeny-arm

Posts: 96
Joined: 1/20/2005
From: Krasnoyarsk, RUSSIA
Status: offline

The happiness has terminated. I had so much pleasures from purchase of the plane. I have forgotten disappointments from unsuccessful purchases of models at Nitro Planes. The happiness has terminated when has begun installation of the equipment (look a photo). At pushing through of the extension piece of a cord, it has not gone. Has opened a side panel and to me it became brutally bad. As so it is possible to hate the buyers to scoff at them. It is More at Nitro Planes I shall never buy. It that I now should open all side panel?

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< Message edited by Evgeny-arm -- 3/12/2008 3:16:45 AM >

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Post #: 6

RE: Zlin EP - What is the CG? - 3/12/2008 3:42:42 AM

mtstopa

Posts: 9
Joined: 12/8/2007
From: Foxboro, MA, USA
Status: offline

I had the same problem trying to get the servo wires throught he wing. Ultimately, it was a fairly easy fix to cut an access opening, run the wires and then glue back in position. While an easy fix, it is a really stupid design flaw. In addition, thy must know of it by now and coul quite easily give a headsup to buyers that they will encounter the problem and how to fix it. I spent an unreasonable amount of time trying to get teh wires through until I realized it was their error.

I was able to open the area immediately forward of the access hole, an area that stays hidden when the wing is installed.

I have a fleet which includes a number of Nitro Planes - I am learning there are no perfect manufacturers - every model presents it own challenges.

While I am on my soap box, the motor mount so seriously restrcits the size of the motor (no more than 28 or 29 mm diameter) that it is difficult to power it properly so that I can take advantage of its aerobatic potential.

(in reply to Evgeny-arm)

Post #: 7

RE: Zlin EP - What is the CG? - 3/12/2008 4:06:03 AM

Evgeny-arm

Posts: 96
Joined: 1/20/2005
From: Krasnoyarsk, RUSSIA
Status: offline

I have certainly found a way of elimination of a problem for 20 minutes. But I wanted accurate model on which pleasantly to look as with Outside and inside. Here two photos which speak as well as by means of what I have found a way out.
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What motor and as I have established, I shall tell hardly later, yet has not completed. But it was necessary to alter to another. I have planes of other manufacturers, I receive positive emotions, and here disappointments.

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< Message edited by Evgeny-arm -- 3/12/2008 4:08:25 AM >

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Post #: 8

RE: Zlin EP - What is the CG? - 3/13/2008 12:48:55 AM

mtstopa

Posts: 9
Joined: 12/8/2007
From: Foxboro, MA, USA
Status: offline

I was able to get access with one rectangular access - then I glued backer blocks to the inside and glued the panel back over the opening - you canhardly tell that the hole was made.

Good luck with your model.

What did you put in it for motor?

(in reply to Evgeny-arm)

Post #: 9

RE: Zlin EP - What is the CG? - 3/13/2008 1:30:41 AM

Evgeny-arm

Posts: 96
Joined: 1/20/2005
From: Krasnoyarsk, RUSSIA
Status: offline

quote:

ORIGINAL: mtstopa
What did you put in it for motor?

Hello.
As well as promised the decision of a problem in installations of the motor on a photo. You understand I solved two problems.
1) installation of the convenient motor.
2) comfortable adjustment CG.
(Still glue has not dried out)
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But to calm down early early. There is a suspicion that the wing has wrong installation of a corner (attack).
*************************************
The model is pleasant. If not such children's mistakes, I would be very happy with this purchase. We shall look as it will fly. As we shall look what illnesses and surprises still to us the manufacturer has presented.

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< Message edited by Evgeny-arm -- 3/13/2008 1:32:48 AM >

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Post #: 10

RE: Zlin EP - What is the CG? - 3/13/2008 3:13:59 AM

mtstopa

Posts: 9
Joined: 12/8/2007
From: Foxboro, MA, USA
Status: offline

That is exactly what I was planning to do - I had an Exceed RC Alpha 480 brushless in but it barely powers enough to make it a scale flyer - aerobatics would be out of the question. i think I will follow your lead and transform the motor mount.

Thanks for the photos.

(in reply to Evgeny-arm)

Post #: 11

RE: Zlin EP - What is the CG? - 3/13/2008 4:33:44 AM

Evgeny-arm

Posts: 96
Joined: 1/20/2005
From: Krasnoyarsk, RUSSIA
Status: offline

My motor gives on the ground thrust of 800 gram. If it will be a little I shall put other motor.
In the long term very much I wish to test this motor if I shall feel that my motor does not consult. -
Venom V28 1200kV Out-Runner Brushless Motor

< Message edited by Evgeny-arm -- 3/13/2008 5:35:18 AM >

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Post #: 12

RE: Zlin EP - What is the CG? - 3/13/2008 4:35:51 AM

opjose

Posts: 5358
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline

quote:

ORIGINAL: Evgeny-arm

The happiness has terminated. I had so much pleasures from purchase of the plane. I have forgotten disappointments from unsuccessful purchases of models at Nitro Planes. The happiness has terminated when has begun installation of the equipment (look a photo). At pushing through of the extension piece of a cord, it has not gone. Has opened a side panel and to me it became brutally bad. As so it is possible to hate the buyers to scoff at them. It is More at Nitro Planes I shall never buy. It that I now should open all side panel?

This is hardly a problem with the plane, and more a problem with an inexperienced builder.

You can use a pin to temporarily remove the connector pin inserts, pass the cable through, then place the connector pins back into the socket.

This is trivial.

You could have also merely resized the circular cutout a bit to avoid having to cut a hole into the wing.

This is not a problem.

_____________________________

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Build em'', fly em'', crash em'' and build more.

(in reply to Evgeny-arm)

Post #: 13