Foamies Talk about building, power setups and anything having to do with e-powered foamy planes!

Homemade RC Glider

Old 06-11-2019, 01:08 PM
  #26  
aaindthu
Member
Thread Starter
 
Join Date: Aug 2018
Location: i live in chennai, tamil nadu, India
Posts: 86
Default

Yes, Mr. Jools, you are right. These wings are definitely not strong enough.
So, I am going to glue 3mm thick balsa strip on top of each wing. That should make it strong enough.
Thanks,
Aaindthu

Last edited by aaindthu; 06-11-2019 at 01:57 PM.
aaindthu is offline  
Old 06-11-2019, 01:32 PM
  #27  
aaindthu
Member
Thread Starter
 
Join Date: Aug 2018
Location: i live in chennai, tamil nadu, India
Posts: 86
Default

Originally Posted by quorneng View Post
Just a crude test but with every thing, including the battery, in place does the wing feel strong enough to allow it to be lifted just by its wing tips? If it can the wing should be adequately strong enough to do a loop without breaking.
So I did the test with two batteries, esc and motor in place. Because the glider is not finished yet and it is likely to end up heavier when finished I used two batteries for this test(one 3s/2200mah, and 3s/1000 mah,) even though I will be using only one for flying.

The wings flex, but not too much. Looks okay to me.

Click image for larger version

Name:	IMG_20190611_170459_HDR.jpg
Views:	37
Size:	1.38 MB
ID:	187522

I have glued 3 mm thick balsa strips along each wing, but only on top of the wing.
I will do the same on the bottom wing as well. I don't feel any significant increase of weight due to the balsa strips.

Last edited by aaindthu; 06-11-2019 at 01:58 PM.
aaindthu is offline  
Old 06-16-2019, 01:58 PM
  #28  
aaindthu
Member
Thread Starter
 
Join Date: Aug 2018
Location: i live in chennai, tamil nadu, India
Posts: 86
Default

Click image for larger version

Name:	IMG_20190615_171114_HDR.jpg
Views:	24
Size:	312.2 KB
ID:	187529Click image for larger version

Name:	IMG_20190616_180018_HDR.jpg
Views:	23
Size:	1.58 MB
ID:	187524Click image for larger version

Name:	IMG_20190616_180640_HDR.jpg
Views:	31
Size:	1.45 MB
ID:	187525


tried to make a clear plastic canopy out of coke bottle, but didn't work.
So, I'm making a foam canopy. I'll put some paper mache over the canopy and around the edges and cover it with black tape, that should look good.

I've also elongated the nose to get the CG right.
Almost complete.
aaindthu is offline  
Old 06-17-2019, 12:05 AM
  #29  
quorneng
Super Contributor
 
quorneng's Avatar
 
Join Date: Jul 2008
Location: Cheshire, UK
Posts: 1,811
Default

aaindthu
Your wing load test looks quite adequate to me and should allow gentle aerobatics.
There is nothing wrong with "adjusting" the length of the fuselage, within reason, to get a suitable CofG position.
quorneng is offline  
Old Yesterday, 12:18 PM
  #30  
aaindthu
Member
Thread Starter
 
Join Date: Aug 2018
Location: i live in chennai, tamil nadu, India
Posts: 86
Default

Phew !! So this is what the glider looks like now.
Click image for larger version

Name:	IMG_20190623_161924_HDR.jpg
Views:	14
Size:	1.48 MB
ID:	187538

I had to shorten the nose back to the original length. The elongated nose messed up the proportions of the glider and it looked very odd, like half glider and half private jet

To bring the CG forward, I reduced the weight in the tail section by narrowing the fuselage and by reducing the distance between the tail-plane and the wings itself.
But still, the CG is somewhere around 40-50 percent of the chord.
I have no choice but to add ballast, just a little bit.
I have also increased the wingspan by 30 centimeters on each side of the wing, just have to glue the balsa strips in the same fashion and
conduct that load test again.

Also, the flaperons are no longer full length and it should reduce the roll sensitivity and improve the stall characteristics when deploying flaps.

Last edited by aaindthu; Yesterday at 12:39 PM.
aaindthu is offline  
Old Today, 12:26 AM
  #31  
quorneng
Super Contributor
 
quorneng's Avatar
 
Join Date: Jul 2008
Location: Cheshire, UK
Posts: 1,811
Default

aaingthu
That looks quite impressive.
Adding wing span and reducing the fuselage tail length at the same time can lead to handling issues. How significant will rather depend on how much 'reserve' stability there was in the first place.

Careful doing a load test. As the wing root is unchanged the ultimate strength of the wing will be reduced directly in proportion to the increase in span.

Whilst the stall characteristics are important so is how it recovers from a stall, particularly when the plane is close to the ground!
The safest combination is normally outboard ailerons and separate inboard flaps. This layout means the inboard wing is likely to stall first and the ailerons still remain effective.
quorneng is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Jimigunne
Foamies
9
11-05-2018 08:21 AM
ayubkhan5130
Scratch and Kit Built Aircraft
7
09-24-2018 07:12 PM
AEAJR
Beginners
28
02-16-2016 12:19 AM
planefixr
Hi-Performance and Sailplanes
2
08-06-2012 03:56 AM

Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Quick Reply: Homemade RC Glider


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.04745 seconds with 10 queries