hi friends,im trying to build a scratchbuilt plane,
im posting the pics,all your suggestions are welcome......
material used is high density thermocol
i think the model is not so good,but as a beginner im just trying to build my own model,the motor mount is sticked by using fevicol sh....
you should be proud of yourself if your a beginner. :D
Its good only... :) Nice Job :thumbsup:
Important:
1)Use Epoxy (araldite) to fabricate the motor mount stick to the foam. Fevicol Sh wont be good at all. Trust me.
2)And what are the Dimensions and Weight of this model ?
3)What power system are you planning to use ?
thanq very much for your reply samanth
i will use araldite as you suggested for the motor mount
the weight of the model without the electronics is 280gms
the power system i have with me is 1500kv motor,tpro 9gservos,2s1p 1000mah battery,30amp esc
when i done a test on the plane using a 1047 and 8040 props it ie moving very fast and it had very good thrust with 1047 prop(as i hold the tail part with my hand),but when i used 8040 its is moving very slowly
u can check the motor properties here
Rotational Speed
2600 RPM/V
Free Load Current
2.0A
Max. Current
8A-20A
Input Voltage
6 - 22V
Max. Efficiency
98%
Weight
44.46g
Motor Dimensions (Diameter x Length)
27.8mm x 23.0mm
Shaft Diameter
3.00mm (Front and Back)
Speed contorller requiement
20A
Input Battery Types
NiCd/ Nimh/ Li-po Battery
Recommend Model
Airplane
Hmm...using a 20A ESC for a 20A motor will generate quite some heat, just make sure you dont run it at 90-100% throttle for a long time.
I am not sure if this will work for high density thermocol, but you can try this -
sand the leading edges of the wing and nose using 320grit Sandpaper or Emory sheet. It will really really help and I have had excellent gliding performance with my models after sanding.
it works with this material,and i had done sanding with Emory paper of different grade,i used kfm2 airfoil,i have to test the flight at no throttle whether it glides or not,but still have 2 doubts ........
1.the length of the plane is 96cms and the length of the wing is 1mts without dihedral,so can this wing will be able to create a good lift?
2.how to design the rudder and elevator????
@Harsha
I think ur total weight with electronics part will be approximately 380 gm .That's good.
U mentioned that ur length of ur wing is 1m but not mentioned breath of it.
plzz give the details of ur plane including actual weight with plan, will help us to solve ur problem.
And for rudder and elevator it is not easy to make it using thermocol.Use coro sheet .Cannot found?
Ok go to nearest cellphone card recharge shop and tell him to give a small advertising sheet of any telecom company.Really they print using coro sheet.
Plz refer the images.
For more details follow this thread
http://www.rcindia.org/self-designed-diy-and-college-projects/glidiator-my-first-trainer-build-log/
@sultan:thanq bhai,i used coro material for rudder and elevator,by the way the length of the wing is 1mt and chord of the wing is 27cms,im thinking to use kfm2 airfoil
Give ur wing aerofoil shape.And also mentain ur cg correctly.I have also made like one .The design is overall complete.
In 5 or 6 days i will post the pic
Ur wing size is sufficient for lift and remember to give aerofoil shape to it.
sure,i will update the progress soon :)
hi everyone,
some more pics,i made the wing with kfm2 airfoil,let me know if i made any mistake in making the wing
wing profile:
kfm2 airfoil(i used one thermocol sheet,cut down into two pieces,sandwiched them one on the other and sanded the trailing and leading edges)
1mt length
27cms chord
The step should be at 50% of the cord, the top layer of thermocol should cove only half the cord. Also you will need a sharper leading edge, sand both top and bottom surface equally.
Refer:
http://www.rcgroups.com/forums/attachment.php?attachmentid=3433154
my doubt is that im using a 1500kv motor with 8040 prop and 2s 1000mah lipo
but the plane is not moving at all when it is given 50percent throtle,it hardly moves when the throttle is given full,how to solve this problem and make it fly????
and where should be the c.g of this plane????
Quote from: SunLikeStar on May 19, 2011, 07:08:35 PM
The step should be at 50% of the cord, the top layer of thermocol should cove only half the cord. Also you will need a sharper leading edge, sand both top and bottom surface equally.
Refer:
http://www.rcgroups.com/forums/attachment.php?attachmentid=3433154
thanq,i will modify the wing now
What is your planes total weight?
i didnt measure yet but it will be not more than 480gms thats for sure
Then you should have enough power with this setup. Finish your wing and then post some picture of your completed plane.
Have you put in the prop correctly? Like the "8X4" written on the prop should be facing outwards away from the plane.
C.G should be at a distance of 1/3rd the total chord length from the leading edge.
@sunlikestar:sure bro
@rohitgupta:ya the prop is facing outwards away from the plane
ya the c.g is little bit further like 1cm,i think this made it nose heavy,when i throw the plane it glides well,but when it is kept down and tested for the movement,its moving heavily...
harsha
Try sanding the front part of the wing with a sand paper so that it gives some aerodynamic shape
may be like this !!
seniors suggest Us..... (I am a Newbie too .. :giggle:)
i modified the wing here are the pics,let me know if there is any mistake,i will try to rebuild or change the wing
I doesn't look like KFm2 anymore but i'm sure it'll fly :thumbsup:
Since you have come this far, I thing you should finish it but coro would have been a much better substitute for this thermocole.
Quote from: rohitgupta322 on May 20, 2011, 09:25:44 AM
Since you have come this far, I thing you should finish it but coro would have been a much better substitute for this thermocole.
ya,but coro is comparatively heavy material so i used this material,instead od kfm2 airfoil can i take a flat wing????will it make the plane fly better???
I have a bigger concern, from the pictures it looks like your wing doesn't have a dihedral. Its an absolute necessity if you are a beginner.
Coro is heavy when compared to thermocol but it is light enough to build planes. The advantage of using coro is that you can get a better aerofoil shape out of it and it is more rigid than thermocol.
@rohitgupta:thanq for the advice bro,i will try to buy some coro and builld the wing,but for now im confused about the electronics too,hope someone would help me.....
thanx in advance,
harsha
guys what should i do now,should i dump the plane and make a new one with less weight???
No .
Your plane is looking fine ... what they mean by " Dihedral " is raising the wings edges from both sides a bit above to the level where the wing is attached to the fuse
This gives more Stability as " We are beginners and More stability is NEEDED for Our Learning Period "
If You are now thinking to make a Dihedral wing Just take two Cycle spokes and insert them into both ends of the wing (side's) and take a thin nylon or any strong thread and tie it to both ends of the spokes and tighten slightly till you get a required dihedral Dont Make it more tight ... wing may break at center ... Make sure You re-Enforce the places along where the spokes are inserted and Mainly at the center ....
Never Think that Your (any Ones) models are not Fly-worthy ...!! They just need a little modifications :thumbsup:
thanq very much ajith,im just thinking to try tip dihedral wing,would build the wing and will post the pics... :) :thanks:
Some specs of MY Plane...
did some work as Bunked collg today :giggle:
wing ; elevator ; Rudder just placed not attached 8-)
Seniors waiting for Your Comments :salute: :headscratch: Suggestions ......
beautiful work ajith,but i think the elevator should be parallel to the wing(seniors correct me if iam wrong)
Harsha i think you need to upgrade to 3s 11.1v lipo. 2s may not provide sufficient power and it because of this tat it is not pulling.
http://desirehobbyrc.com/index.php?act=viewProd&productId=55
With 8x4 you can use 3s and it may take the weight. With 2s you may need a bigger prop.
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so can i use a 1047 prop with a 2s battery instead of 8040???
i had tested with 1047 prop its pulling at 50 percent throttle,the esc is fine but the mortar is little bit hot
Quote from: harsha on May 16, 2011, 08:44:09 PM
material used is high density thermocol
where do you get this type of thermocol
High density thermocol is normally available in Insulation/Refrigeration stores. But, I still feel that coro is easier to work with, unless u get extruded polystyrene a.k.a biofoam.
here i can get high density thermocol directly form thermocol factory,which is nearer to my house :) ;D ;D
Is it available at any stationary or some other shop?
Do you have any idea that how much a rc plane costs about? ;D
@ s2k:the one which is available in stationery shops is not a high density thermo col sheets,high density thermo col is something we get in fridge packing,electronic goods packing etc...and i think there are many websites,research for sometime in rc india and rc groups,i dont know much about the cost of a beginner plane :)
Quote from: s2k on June 08, 2011, 03:50:37 PM
Do you have any idea that how much a rc plane costs about? ;D
It is a very vague question, its like asking how much a car costs? Well it depends on what you want, the type of plane, what you already have at hand, etc.
The cheapest you could get to a complete ready to fly package with reusable parts will be around :Rs: 7-8k .
Spend some time and research the forum thoroughly. Most of the beginner's questions have already been discussed earlier.
What is the dencity of your thermocol? Generally art quality thermocols are 4.5Kg/Cubic Meter and Delux quality are 6.5 Kg/Cubic Meter. High dencity thermocols start designated by dencity from 7 and dencity 20 is good/optimum for aeromodeling. Some people order Dencity 34 also. This is how they (dealer) specify the thermocol.
Generally Thermocols of dencity 20 sell price is 130 - 200Rs/Kg and you have to order at least 1 CuM. Despatch charges extra from Dealer's outlet. This is the scenario of Kolkata. What is your cost harsha? Can they produce fuselage patern & wing if provided with the dice or they make dice? Wastage will be less and simultaneously perfect shape with low cost will be available to us.
Actually I find the dealer in kolkata but not find the factory till now.
Thanks
Kalyan, what is the highest density of thermocole available in Kolkata in retail and what are the prices? I need some high density thermocole urgently.
Regards.
@VC : It costs :Rs: 80 for 5mm sheet 65 * 95 cm and :Rs:90 for 8 mm sheet 50 *80 cm in Pune
@ajith : is it a blue baby ?, I am also building same of high density thermocol it looks same like yours but it's of 28" only :) . this will be my first plane. will upload pic soon ..
Loooks like blue baby..Beautiful plane Ajith, dense thermocol are less expensive light weight at the price available locally. I have used it to build some of my scratch builts. here is the most recent one.Electrics need to be installed-
Here are some pics of my blue baby :)