SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Nov 11, 2014, 01:03 AM
Registered User
United States, CA, Placentia
Joined Jun 2014
18 Posts
Ok almost done with it. Taking my time. Another question, what's the best way to get gloss back to a dull spot on the carbon? And I've been looking in here, great info by the way, what is the best cg starting point for the polaris? Thx. Brian
Bchirrick is offline Find More Posts by Bchirrick
Reply With Quote
Sign up now
to remove ads between posts
Old Nov 11, 2014, 01:18 AM
Registered User
elkski's Avatar
United States, UT, Sandy
Joined May 2013
3,150 Posts
Brian, don't fret the looks. Can't remember my cg.
If its dull from sanding you can use thin CA and rub on with plastic baggie to smooth it out. It will shine up.
elkski is offline Find More Posts by elkski
Reply With Quote
Old Nov 11, 2014, 01:24 AM
Throw it like you hate it
RCPC's Avatar
United States, CA, Castro Valley
Joined Apr 2007
3,086 Posts
Recommended CG for the Polaris is 65-69mm aft of the leading edge.

My preferred CG is 67-68mm which is a good balance between showing lift and providing enough stability.
Cheers
Paul
RCPC is offline Find More Posts by RCPC
RCG Plus Member
Reply With Quote
Old Nov 11, 2014, 08:18 AM
Matthew Ceradini
United States, NC, Raleigh
Joined Jun 2011
197 Posts
Quote:
Originally Posted by Bchirrick View Post
Ok almost done with it. Taking my time. Another question, what's the best way to get gloss back to a dull spot on the carbon? And I've been looking in here, great info by the way, what is the best cg starting point for the polaris? Thx. Brian
I was chatting with Bruce Davidson at the Pumpkin Chunk this weekend about his Polaris. He's flying it with the CG 4.25 inches from the trailing edge. However, we discussed that the CG is ultimately up to you and how you like the plane to fly. The dive test is a good way to get the CG dialed in. When you find the CG you like, mark it off on the fuselage so you'll always have a point of reference.
Ceradinimp is offline Find More Posts by Ceradinimp
Reply With Quote
Old Nov 11, 2014, 08:21 AM
Matthew Ceradini
United States, NC, Raleigh
Joined Jun 2011
197 Posts
Anybody know where I can get new tail feather for a Polaris. They don't have to be "Polaris" tail feather, just something comparable. Looking for light but durable for the vertical stab. I'm going to rudderless because apparently that's what the plane was designed for.
Ceradinimp is offline Find More Posts by Ceradinimp
Reply With Quote
Old Nov 11, 2014, 10:57 AM
Registered User
United States, CA, Placentia
Joined Jun 2014
18 Posts
Great, thanks everyone for the help. I'll try that. I'll keep you posted.
Bchirrick is offline Find More Posts by Bchirrick
Reply With Quote
Old Nov 13, 2014, 10:08 PM
Registered User
United States, CA, Placentia
Joined Jun 2014
18 Posts
Is there a different cg for rudder vs rudderless? I installed a rudder and to get the cg to 68-69 makes it pretty heavy.
Bchirrick is offline Find More Posts by Bchirrick
Reply With Quote
Old Nov 13, 2014, 10:43 PM
Registered User
elkski's Avatar
United States, UT, Sandy
Joined May 2013
3,150 Posts
Should be the same cg . its based on the airfoil methinks
elkski is offline Find More Posts by elkski
Reply With Quote
Old Nov 13, 2014, 11:14 PM
Registered User
United States, CA, Placentia
Joined Jun 2014
18 Posts
Think I need to move some things around in the fuse. Move the servos up more. Have them vertical now.
Bchirrick is offline Find More Posts by Bchirrick
Reply With Quote
Old Nov 14, 2014, 12:21 AM
Overkill is underrated
elac2az's Avatar
United States, AZ, Phoenix
Joined Apr 2007
151 Posts
Bchirrick, I have a PDF document of set-up information for Polaris which I believe I got from the MMT website a couple months ago. It describes a 66mm CG for a ruddered Polaris.
But as others have stated, your glider's CG should reflect your flying style and handling preferences.

-Ed
elac2az is offline Find More Posts by elac2az
Reply With Quote
Old Nov 14, 2014, 01:18 AM
Throw it like you hate it
RCPC's Avatar
United States, CA, Castro Valley
Joined Apr 2007
3,086 Posts
Quote:
Originally Posted by Bchirrick View Post
Is there a different cg for rudder vs rudderless? I installed a rudder and to get the cg to 68-69 makes it pretty heavy.
What is heavy? The Polaris carries weight well. It is a big wing.
Paul
RCPC is offline Find More Posts by RCPC
RCG Plus Member
Reply With Quote
Old Nov 14, 2014, 08:05 AM
Team WC2013 F3K
oakman7004's Avatar
Sweden
Joined Dec 2004
1,008 Posts
+1000

I flew my Polaris over a AUW of 320g as soon as there was any thermals....I could load mine to AUW 490g, which was regularly used when the wind was a blowing close to FAI limits.

/Jonas Ekman
oakman7004 is offline Find More Posts by oakman7004
Reply With Quote
Old Nov 14, 2014, 08:35 PM
M Seid
Solana Beach, Ca
Joined Sep 2006
3,147 Posts
Quote:
Originally Posted by oakman7004 View Post
+1000

I flew my Polaris over a AUW of 320g as soon as there was any thermals....I could load mine to AUW 490g, which was regularly used when the wind was a blowing close to FAI limits.

/Jonas Ekman
Jonas, that is because you are an immortal.

Us earthlings can't lift 490 grams, let alone throw 490 grams.
M Seid is offline Find More Posts by M Seid
RCG Plus Member
Reply With Quote
Old Nov 14, 2014, 11:41 PM
Registered User
United States, CA, Placentia
Joined Jun 2014
18 Posts
Lol. It's a hair under 300. But I think I can get the servos closer to the nose and take some lead out. Thx everyone for the help. Gonna fly it as is tomorrow and see how it goes. Wish me luck....
Bchirrick is offline Find More Posts by Bchirrick
Reply With Quote
Old Nov 15, 2014, 10:54 AM
Team WC2013 F3K
oakman7004's Avatar
Sweden
Joined Dec 2004
1,008 Posts
Quote:
Originally Posted by M Seid View Post
Jonas, that is because you are an immortal.

Us earthlings can't lift 490 grams, let alone throw 490 grams.
well having Thor as brother helps....lol
oakman7004 is offline Find More Posts by oakman7004
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Rudderless launches isoarthenland Hand Launch 19 Sep 15, 2011 11:11 PM
Wanted Bagged, Rudderless DLG Tailset thumbhead Aircraft - Sailplanes (FS/W) 4 Aug 22, 2011 09:22 PM
Sold Twister-1 DLG (ARF + Ballast + Swindell Rudderless) Kai@UCSB Aircraft - Sailplanes (FS/W) 4 Jul 25, 2011 08:34 PM
FS Rudderless Art Hobby Bobolink DLG amike_321 Aircraft - Sailplanes (FS/W) 6 Feb 07, 2004 09:30 PM