Learnt a lot from the free flight TLG.
So decided to make a larger one capable of carrying RC.
Got small lipo, ESC and servos.
Made proper patterns in hardwood for the airfoil shape (AG03 root, AG11 tip)

Hunted through Harveer's stock for light balsa.
Found one 5/16x4x48 that was 96gms. That is 6lb/cft, ie contest grade.
Cut into 4 panels for polyhedral, and ease of sanding.
Each panel took 2 hours of sanding (don't have a razor plane).
After collecting a cupful of balsa dust (never know when you'll need it!), threw away rest.
Result was worth the effort. (Pinholes in section are for epoxy to grip well in the panel joints)
Weight of 4 panels 72gms.
With lipo, servos, ESC at 30g, Rx 4g, boom 15g, tail est 7g, pod est 10g, targeting AUW under 150gms.
Hope no extra nose weight is needed, so that wing loading does not exceed 4oz/sqft.
(FF TLG is 3.5 oz/sqft loading)

For anyone interested in the technical details:
Aspect ratio is 12. Rather high. Hope it won't flutter on full power launch.
Estimate Reynolds Number of around 100,000 at launch and around 25,000 in glide.
At 25k Re, it will need Cl of about 1 to support 150gms. This is clearly wishful thinking, but what's the harm in trying?
Have reduced the tail volume coefficients to about 2/3rd of what was used in the FF TLG, as the need for stability is reduced with RC...
Replacing Y tail with cruciform, as 4gm Rx has only 4 channels, so no mixing available.

Edit: No mixing? Wrong. Only Ch 2&4 required. So used to thinking flaperon that i forgot V tail doesn't need Ch 5 or 6. Well one lives and learns...

G Great

Great Aerofoil achieved sir

Completed wing seems too fragile due to high aspect ratio and low (6%) thickness laminar flow airfoil.
Can't think of any alternative except to glass the entire wing, as i have no CF rovings or tape.
Started with top of one tip panel. May have to rip it off if it adds too much weight.
1 side of 1 tip has added 4gms. Hence 32gms will be added to my 72gm wing
Still better than breaking on the first tip first landing...
Should have measured the bending resistance without glass, for comparison...

Excellence at its best ....

Thanks Abhay, Manoj and DocNayeem.

Decided to make a last minute attempt to complete by tomorrow!
Fibre glassed the entire wing. Weight increased from 72gms to 100.
Pics of bulkheads with hole for CF boom, and V tail with torsion springs for elevons.
(No pushrod, only pulling by string against torsion spring)
Bulkhead for wing mounting bolt needed a shallow to accomodate centre dihedral.
Going to make the fuselage pod now...

good job , wing finish is very good craftsmanship


that is expected from you sir

i want to say is it right or wrong

as seen in the photo that you are using some weight at the nose in place of it place battery at the nose could reduce some extra weight of the airplane.

and for minor adjustment of c.g place very small weight near the  leading edge .
and replace it position so as to fly it fast or slow which ever is needed.

Where did you see the nose? On the free flight TLG?
RCTLG fuselage is still under construction.

Looking good, sir. You have some very good sanding skills.

I'm guessing, you're using the ESC for the BEC, I think you could cut down on a few grams using a UBEC instead (If you have one ATM).

Do you coat the bare wing with epoxy, lay the FG and apply epoxy again over the glass? I had attempted to glass a small balsa wing, the wood absorbed a bit more epoxy than I had anticipated and weight increased by more than twice, it was a loss.

@anjanbabu
Since you mentioned it, i decided to look at just what i have.
Being satisfied with the performance, size and weight of the 10a ESC in the HK Donkey combo, i got an HK 10a ESC from Adiboy and one from another forum member.
Now i see that they don't say 10a ESC. They say 10a UBEC!

If you know what's the difference, pl advise.
No time to research just now as RCTLG waiting to be completed.
Progress so far till 1130pm in pic below.

BTW lovely British Racing Green on your trike. And i would have expected a tail wheel trike to oversteer under power...

Edit: Forgot to answer your question. No epoxy on bare wood. First laid glass cloth then dribbled epoxy and spread with a credit card. I realise now that nearly all the epoxy can be scraped away with the card. Did not try soaking up epoxy with tissue towels, as RC Aunt warned that we will end up with bits of tissue all over the wing. I still dont think the wing is strong enough. Have just one day to complete and test fly. Maybe a tow launch. Tomorrow will see if i have the guts for a discus launch before i get carbon fibre/ kevlar reinforcement.

If you're talking about the one placed on the weighing scale in the first post, that's definitely an ESC because it has motor connection wires on them.
ESCs come with built in UBEC/SBEC to provide 5v to the Rx. I was talking about just an external BEC that only provides power for Rx, like this one-- http://www.rcbazaar.com/products/807-hobbywing-switchable-u-bec-3a-56v.aspx

I had blue in mind, but can't beat the BRG when it comes to showing off raw power. 
I'll be building an aeroplane some time soon, tailwheel drifting on that.

I noticed that if I don't wet the wing surface with epoxy before laying the FG, the adhesion is very poor and surface is not smooth at all. I use a 360gsm cloth, that could be the problem.

I never had success with DLGs, hopefully, I can learn some bits here.

360gms? Wow.
What i'm using is under 30!

Forget 3oz/sqft loading. Now only hoping not to exceed 4.5oz/sqft.
Guess one should count one's blessings. At least i wont have add ballast. Wind here >15kmph all day.

I mentioned the FG cloth density as 360gsm (grams/meter).

Glider looking nice, good luck for tomorrow's fight. 

@anjanbabu
Thanks.
My glass skin is under 30gms/sqmtr!
Looks like this.

Build status at 2:20am!
Second pic shows wedge inserted in V and sanded round to improve contact with boom.

Nose length increased to avoid having to add nose weight.
To compensate for additional side area ahead of CG, have to add sub-fin to add yaw damping.
(This will add 2gms to tail, to compensate for which i will add 8gms to the nose. AAARGGGHHH)

Is there a formula to calculate optimum nose and tail length for HLG/DLG?

@anjanbabu
The stability in pitch and yaw imparted by the stab and fin is a function of their size (area) and moment arm (ie, distance from aerodynamic centre of the wing, generally taken as being at 25% of the chord from the wing leading edge)
It also depends on the wing area, wing chord and wing span.
This is measured as (horizontal/vertical) tail volume coefficients.
The value varies for different types of models like glider, trainer, aerobatic, 3D, jet etc.
In addition you have to decide how much of something called 'margin of static stability' you want.

But since much of our 'design' of models is based on TLAR (that looks about right), a reasonable thumb rule is 3-4 times the wing chord for wing TE to tail LE, and about 1-1.5 times the wing chord from wing LE to nose.

Hope this was of some help. Unless you are interested in aerodynamics for its own sake, the time tested method is to find a successful design and copy it with cosmetic changes!

Pic shows build status at 3:25 am!

Completed at last. But it is too dark to test fly (1245am).
Worked whole of yesterday night.
Hope i get up early enough to test fly and shoot video to post before 10am deadline.

Pic 1 Complete except for stickers
Pic 2 Note pull thread instead of pushrod

Best of luck to all participants.

Good Morning Mr. Iyer

- How did you do the Rudder , elevator linkages ?? Did you load the
opposite side of the surface with a spring / rubberband ?

Could you post a picture ??

@ Saikat sir,
Guitar E string.
First tried '[' shape (like a staple). Spine 2cm, arms 1cm each.
Elevator folded back flat on stab, one arm each pushed into stab and elevator.
Too strong.
Increased spine length to 4cm, arms 1cm.
Instead of staple shape, in which there is 180 degree torsion at neutral, made a crank shape like aileron torque rod, so that torsion is only 90degree at neutral.

Managed a test flight video in the nick of time. Test glide from shoulder height went over 60 meters!

www.youtube.com/watch?feature=youtube_gdata_player&v=ie2thgI193A

Very nice sir 

No RC? Disqualified 

@sanjayrai55,
One FF glider
One RC glider
Covered both bets. Tarzan and Son of Tarzan, haha.
Needed to built about 10 more (like you  ) to stand a chance.
Never got around to completing Fanjet...