New Products Flash Sale
Thread Tools
Old May 10, 2015, 02:38 PM
mior is offline
Find More Posts by mior
Registered User
Slovakia, Nové Mesto nad Váhom
Joined Jun 2009
21 Posts
In this picture I see that the rear rotor is not aligned with the rudder. Is it right?
If yes, why?
mior is offline Find More Posts by mior
Reply With Quote
Sign up now
to remove ads between posts
Old May 10, 2015, 10:36 PM
Ran D. St. Clair is online now
Find More Posts by Ran D. St. Clair
Registered User
Ran D. St. Clair's Avatar
United States, CA, Sunnyvale
Joined Dec 2006
1,811 Posts
Quote:
Originally Posted by mior View Post
In this picture I see that the rear rotor is not aligned with the rudder. Is it right?
If yes, why?
Yes, it is intentional. The 4 wing motors are 2 CW and 2 CCW so in theory they cancel each other out in terms of torque. There is nothing to cancel the torque of the tail rotor however. It turns CCW when viewed from above, so the plane would naturally yaw to the right. by leaning the tail rotor to the right it drags the tail to the right, and nose to the left so it all cancels out. The plane then needs to lean slightly left to counter the right thrust from the tail, but it is such a tiny amount you can't even see it.
Ran D. St. Clair is online now Find More Posts by Ran D. St. Clair
Reply With Quote
Old May 11, 2015, 04:18 AM
mior is offline
Find More Posts by mior
Registered User
Slovakia, Nové Mesto nad Váhom
Joined Jun 2009
21 Posts
Quote:
Originally Posted by Ran D. St. Clair View Post
Yes, it is intentional. The 4 wing motors are 2 CW and 2 CCW so in theory they cancel each other out in terms of torque. There is nothing to cancel the torque of the tail rotor however. It turns CCW when viewed from above, so the plane would naturally yaw to the right. by leaning the tail rotor to the right it drags the tail to the right, and nose to the left so it all cancels out. The plane then needs to lean slightly left to counter the right thrust from the tail, but it is such a tiny amount you can't even see it.
And what is the angle of rotor, please?
mior is offline Find More Posts by mior
Reply With Quote
Old May 11, 2015, 08:35 AM
Ran D. St. Clair is online now
Find More Posts by Ran D. St. Clair
Registered User
Ran D. St. Clair's Avatar
United States, CA, Sunnyvale
Joined Dec 2006
1,811 Posts
Quote:
Originally Posted by mior View Post
And what is the angle of rotor, please?
You can measure it from the picture, or do what I did and see which way the plane wants to turn and adjust it from there. It is not critical. Yaw control is weak on the XC-142, since it is controlled by the ailerons. If there is any headwind, or the plane has any forward speed it will weathervane into the wind anyway. If flown indoors in a small room it will yaw somewhat randomly due to the air recirculation within the room. If you want to see the trim point you need to be outdoors on a calm day and at least 4 ft. off the ground.
Ran D. St. Clair is online now Find More Posts by Ran D. St. Clair
Reply With Quote
Old Aug 28, 2015, 10:54 PM
barjunk is online now
Find More Posts by barjunk
Registered User
Joined Sep 2011
50 Posts
I went to this link and was able to look at the files:

http://www.rcgroups.com/forums/showt...2008164&page=9

Is there a place which shows what the sizes that each of the letters represent?

In the mean time, I will look at the hand drawn plans for measurements.
barjunk is online now Find More Posts by barjunk
Reply With Quote
Old Aug 28, 2015, 11:48 PM
Ran D. St. Clair is online now
Find More Posts by Ran D. St. Clair
Registered User
Ran D. St. Clair's Avatar
United States, CA, Sunnyvale
Joined Dec 2006
1,811 Posts
Quote:
Originally Posted by barjunk View Post
I went to this link and was able to look at the files:

http://www.rcgroups.com/forums/showt...2008164&page=9

Is there a place which shows what the sizes that each of the letters represent?

In the mean time, I will look at the hand drawn plans for measurements.
There are dimensions on "sheet_ed2_A0" and "sheet1_ed2_A0".

I assume the A4, and A0 designations are European standard paper sizes that you would select when printing. I see A4 under "page setup" when printing under Adobe. A0 isn't offered but I assume that is a large format that my little home printer can't support.

Sorry, I am not much of an expert on printers and printing.
Ran D. St. Clair is online now Find More Posts by Ran D. St. Clair
Reply With Quote
Old Yesterday, 09:40 AM
Brandano is offline
Find More Posts by Brandano
Registered User
Joined Oct 2004
3,175 Posts
A3 is twice the size of an A4, A2 is twice that and so on. All the "A" formats respect the golden proportion, so you can take a sheet, cut it in half along the long edge and get two sheets of the next number up. A0 is very big, and probably only large plotters can handle it.
Brandano is offline Find More Posts by Brandano
Reply With Quote
Old Yesterday, 01:46 PM
excalibur46 is online now
Find More Posts by excalibur46
Registered User
France
Joined Dec 2010
62 Posts
I also gave the A0 because the designs are in this case the scale 1 in one sheet, but yes, you need a large printer / plotter for it
A4 is used for the scale 1 with a standard printer, but with several sheets to assemble
excalibur46 is online now Find More Posts by excalibur46
Reply With Quote
Old Yesterday, 08:46 PM
barjunk is online now
Find More Posts by barjunk
Registered User
Joined Sep 2011
50 Posts
OK. So this is scale as long as you use A0 paper to print it on, do I have that right?

Also I assume the numbers are in mm not cm, correct?
barjunk is online now Find More Posts by barjunk
Reply With Quote
Old Yesterday, 10:08 PM
Ran D. St. Clair is online now
Find More Posts by Ran D. St. Clair
Registered User
Ran D. St. Clair's Avatar
United States, CA, Sunnyvale
Joined Dec 2006
1,811 Posts
Quote:
Originally Posted by barjunk View Post
OK. So this is scale as long as you use A0 paper to print it on, do I have that right?

Also I assume the numbers are in mm not cm, correct?
Excalubur46 will confirm or deny, but I believe if you print it at 100% then it will be the correct size no matter what paper size you print it on. You can test this theory by printing something with a dimension and verifying that it matches the dimension.

Yes, dimensions are in mm.
Ran D. St. Clair is online now Find More Posts by Ran D. St. Clair
Reply With Quote
Old Yesterday, 10:24 PM
barjunk is online now
Find More Posts by barjunk
Registered User
Joined Sep 2011
50 Posts
Thanks Ran.

I'm excited about making this work.
barjunk is online now Find More Posts by barjunk
Reply With Quote
Old Yesterday, 10:32 PM
Ran D. St. Clair is online now
Find More Posts by Ran D. St. Clair
Registered User
Ran D. St. Clair's Avatar
United States, CA, Sunnyvale
Joined Dec 2006
1,811 Posts
Quote:
Originally Posted by barjunk View Post
Thanks Ran.

I'm excited about making this work.
I just tried printing at 100% and the dimension was correct.

I should warn you, this is an advanced model. It is probably the most difficult model/VTOL I have ever built in terms of getting it to fly reasonably well. To my knowledge, there is one other person who built it according to these plans and they were successful in all respects, but they went through a long learning curve in terms of understanding the flight controller and getting the aircraft tuned correctly.

Good luck.

R.D.
Ran D. St. Clair is online now Find More Posts by Ran D. St. Clair
Reply With Quote


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log Xc-142 malakiblunt VTOLs 76 May 11, 2014 02:52 PM
Discussion XC-142 VTOL Test Aircraft rimshotcopter VTOLs 17 Dec 25, 2013 10:46 PM
Build Log XC-142 VTOL Transport malakiblunt RC Airliners (Commercial, Cargo, Troop Carrier) 63 Jun 05, 2013 03:52 AM
Discussion Xc-142 malakiblunt VTOLs 22 Sep 28, 2010 03:39 AM
Discussion Vtol Xc-142 CESARNOGUEIRA VTOLs 0 Oct 01, 2009 09:25 PM