Hi,
Just completed the build of the Micro - B which is in the EZB class of indoor free flight rubber models.
Wing span 17 inches.
The target weight for this design is 0.75 gms or less -- has been built upto 0.45 gms.
This can be achieved if you have special indoor low density balsa ground to required thickness which is not available in India. Can be imported from guys specialising in this -- pretty expensive.
I managed to keep the weight down to 3.0 gms.
This model can do flights up to 20 mins if trimmed well and the proper propeller (pitch) and rubber thickness ( gives correct torque) combination is used.
Flights in the house show a stable glide and very slow sink rate. Seems promising. Proper test flights in large indoor space will be done shortly.
Pics of model and build details being attached.
Anant
Hi,
Some build pics of the Micro -- B
Wing, stab and fin covered with 2 micron thickness mylar.
Will notice tail boom at angle -- this makes model turn in left hand circle.
Wing and stab posts and prop shaft made of 1 mm carbon fibre rod -- stiff strong balsa of this thin dimension difficult to get -- tried stripped bamboo -- carbon rod weight was same but it is much stiffer.
Propeller Nose ring and bearing is from Ikara.
Propeller blades sanded to 0.15 mm thickness and moulded on 3 inch dia bottle. Prop pitch set at 45 degs on propeller pitch gauge.
See pics
Anant
Hi,
Micro -- B build pics contd
Prop build pics.
Balsa Blades soaked in hot water for 5 mins then set on bottle and wrapped with bandage for setting camber. Allowed to dry overnight.
Anant
Hi,
Some more pics of the build
Also pic of a balsa stripper. Absolutely essential for indoor ultra light construction.
Wing and stab posts of 1 mm carbon rod. Tissue tubes fixed on wing and stabs for mounting wing on fuselage -- the angle of incidence can then be adjusted to give optimum lift.Stab incidence can also be adjusted to give elevator effect.
Would welcome any queries or comments.
Anant
:hatsoff: good job,How's the bild going?what rubber are you using.flight test done?all the best looking forward to see this baby fly.
@romanxdsouza,
Your first post in six years!
Welcome back.
Btw, you responded to Glidiator's post that's eight years old!
Regards
Iyer
Hey hi sir,how u been,well yes totally caught up ,lots going on in life,was doing some cleaning so came across my builds,thought I'll drop by here....don't see much micro.dint realise post is 8yrs old..
The micro EZB is safe in a box. Must get it out someday again for flights.
Rains in full swing here in Goa.
Kept busy with an offbeat model - cylindrical wing - the Hoopskirt
https://outerzone.co.uk/plan_details.asp?ID=9681
Original had a Cox 0.020. I'm trying to see if a 8520 motor 1S battery , E20 timer, with1300 mm prop with reduction gear will give sufficient power.
Tried to post a pic - file size too large.
Will compress and post the build in separate post
Anant
Ok..wanted to see a flight video.did you use rubber band,do let me know where u get it from.
Quote from: romanxdsouza on September 12, 2024, 09:56:07 PM
Ok..wanted to see a flight video.did you use rubber band,do let me know where u get it from.
Glidiator has a friend in Pune, from whom I got some Tan Super Sport rubber strips.
I'm sending you his phone number by PM.