Your primary airfoil is perhaps too thin for flying at that speed and with that small motor. It forces you to fly at a high angle of attack to maintain altitude and this causes drag and micro-stalls. Try using a more teardrop-shaped airfoil or perhaps one with a bit of camber so that you maintain better lift and attack angle at low speeds. This will also improve your rudder authority a little. This is perhaps a more efficient approach than to try to design for more power.
that I felt while flying plane too, but if we try to bend solar cell with relatively higher curvature, it tend to crack quickly. So i tried to keep curvature of upper face of ail foil lower.
this is super cool, nice very low cost design. would love to see you design one a little bigger, maybe a 2s system, with a small brushless motor and maybe a folding prop?
thanks for posting. good work. ESPECIALLY, the use of forward-installed servos. some thoughts. regarding 'power': volts is Not power, amps is Not power. power is expressed in WATTS. watts Equal, volts MULTIPLIED by amps. you have chosen to use a WONKY prop. i suggest that a S F prop of similar diameter be used, INSTEAD. it should be understood that 'full throttle' flying, is NOT the goal. BECAUSE, just about any (correctly designed) model will CRUISE, at 2/3 throttle OR LESS. (elevator Should Be TRIMMED, so that a model flies level, at a nominal (cruising) airspeed. trimming is done by a Pilot, using his Left hand to manipulate tx trim switches, DURING a so-called 'maiden flight'. ) where ever practical, Reduce Weight. (use the lightest battery, that is practical.) do NOT use cf, or large-ish steel wire, for ANYTHING. use bamboo or spruce or poplar. make a pushrod by attaching a piece of wire at each end of a bamboo (skewer). in each piece of wire, form a modified Z-bend (with some extra wire at one side, for mounting). this bend is comprised of three straight sections; and two 'opposing' ninety degree bends. a tail boom Should be made of a material, such as spruce, that allows Correct optimization (tapering) of its Distribution of mass (dom). in flight, the model appears to have a tail-Heavy dom. correct location of the cg of this model is at 30 percent of chord; the use of a slightly forward cg ensures that a model is flying with a Nose-heavy dom. at 2:35, poor profile selection. this wing profile is TOO thin, and Too close to being Symmetrical ( and ZERO-lift). see my profile tutorials. use the clark-y profile. PERIOD. regarding piloting: during Any turn, a Pilot should be 'ready' to do two things. increase throttle, a bit. and/or put in a bit of up-elevator. the later will increase the rate of a turn. make (relatively) flat turns. cheers googletranslate some resources modified z-bend (at servo arm) s3.amazonaws.com/assets.flitetest.com/article_images/medium/sam-0547-jpg_1390282013.jpg clark-y (v1) profile, at illustration en.wikipedia.org/wiki/Clark_Y wright.nasa.gov/airplane/shortw.html www.stengel.mycpanel.princeton.edu/MAE331Lecture6.pdf
Thanks for such a explanatory feedback, especially on wing thickness. Even while flying I had to give continuous effort to keep it straight and not let it stall. but there is a major issue in keeping wing thick. as increasing thickness will result in increased curvature of the upper face of wing where solar cell needs to be placed and it has the limitation of solar cell bend. And if we talk on power monitor, as you rightly said current or voltage alone can not represent power. but in this case, both power sources are connected in parallel having a similar value of voltage so it can be multiplied to current measured by other meters. Using bamboo stick instead of CF rod will be the surely inexpensive way forward, that I will try to implement on the next version.
@@bi1420 hi. a few more thoughts. DESIGN the wing/airframe, to Accommodate the pv components AND the use of a lift-making profile. start with a main wing chord of sufficient length. then, chord should be equal to about 22 percent of fuselage length. fuselage length should be equal to, about, 75 percent of wingspan. horiz-stab span Should be Equal to 30 percent of wingspan. (normal) E prop diameter should be equal to, about, 25 percent of wingspan. cheers googletranslate
Your primary airfoil is perhaps too thin for flying at that speed and with that small motor. It forces you to fly at a high angle of attack to maintain altitude and this causes drag and micro-stalls. Try using a more teardrop-shaped airfoil or perhaps one with a bit of camber so that you maintain better lift and attack angle at low speeds. This will also improve your rudder authority a little. This is perhaps a more efficient approach than to try to design for more power.
that I felt while flying plane too, but if we try to bend solar cell with relatively higher curvature, it tend to crack quickly. So i tried to keep curvature of upper face of ail foil lower.
Good Work!
Nice! Question, its not a problem that the battery can discharge into the solar cells? I would think a Schottky diode would be needed?
you are right. I missed that.
What is the flight time of this plane
this is super cool, nice very low cost design. would love to see you design one a little bigger, maybe a 2s system, with a small brushless motor and maybe a folding prop?
I have prepared exactly same plane as you are describing, hopefully share it in upcoming month.
Very nice, remember have a solar powered plane run a 3s, it is a very good flier.
What an interesting project! Very nice work.
hey - I like your work
Hi excellent work, have you done with next version of the plane
Yes, next version is ready. I will prepare and post video of that.
very good
nice work, waiting for full autonomous forever flyer programmable destination model:)
Love to hear that you liked the project. I will share my new project with better flying time (no automation yet).
nice job keep it up.
can anyone describe how to make the tail according to flitetest
thanks for posting. good work. ESPECIALLY, the use of forward-installed servos. some thoughts. regarding 'power': volts is Not power, amps is Not power. power is expressed in WATTS. watts Equal, volts MULTIPLIED by amps. you have chosen to use a WONKY prop. i suggest that a S F prop of similar diameter be used, INSTEAD. it should be understood that 'full throttle' flying, is NOT the goal. BECAUSE, just about any (correctly designed) model will CRUISE, at 2/3 throttle OR LESS. (elevator Should Be TRIMMED, so that a model flies level, at a nominal (cruising) airspeed. trimming is done by a Pilot, using his Left hand to manipulate tx trim switches, DURING a so-called 'maiden flight'. ) where ever practical, Reduce Weight. (use the lightest battery, that is practical.) do NOT use cf, or large-ish steel wire, for ANYTHING. use bamboo or spruce or poplar. make a pushrod by attaching a piece of wire at each end of a bamboo (skewer). in each piece of wire, form a modified Z-bend (with some extra wire at one side, for mounting). this bend is comprised of three straight sections; and two 'opposing' ninety degree bends. a tail boom Should be made of a material, such as spruce, that allows Correct optimization (tapering) of its Distribution of mass (dom). in flight, the model appears to have a tail-Heavy dom. correct location of the cg of this model is at 30 percent of chord; the use of a slightly forward cg ensures that a model is flying with a Nose-heavy dom. at 2:35, poor profile selection. this wing profile is TOO thin, and Too close to being Symmetrical ( and ZERO-lift). see my profile tutorials. use the clark-y profile. PERIOD. regarding piloting: during Any turn, a Pilot should be 'ready' to do two things. increase throttle, a bit. and/or put in a bit of up-elevator. the later will increase the rate of a turn. make (relatively) flat turns.
cheers googletranslate some resources
modified z-bend (at servo arm)
s3.amazonaws.com/assets.flitetest.com/article_images/medium/sam-0547-jpg_1390282013.jpg
clark-y (v1) profile, at illustration
en.wikipedia.org/wiki/Clark_Y
wright.nasa.gov/airplane/shortw.html
www.stengel.mycpanel.princeton.edu/MAE331Lecture6.pdf
Thanks for such a explanatory feedback, especially on wing thickness. Even while flying I had to give continuous effort to keep it straight and not let it stall. but there is a major issue in keeping wing thick. as increasing thickness will result in increased curvature of the upper face of wing where solar cell needs to be placed and it has the limitation of solar cell bend. And if we talk on power monitor, as you rightly said current or voltage alone can not represent power. but in this case, both power sources are connected in parallel having a similar value of voltage so it can be multiplied to current measured by other meters. Using bamboo stick instead of CF rod will be the surely inexpensive way forward, that I will try to implement on the next version.
@@bi1420 hi. a few more thoughts. DESIGN the wing/airframe, to Accommodate the pv components AND the use of a lift-making profile. start with a main wing chord of sufficient length. then, chord should be equal to about 22 percent of fuselage length. fuselage length should be equal to, about, 75 percent of wingspan. horiz-stab span Should be Equal to 30 percent of wingspan. (normal) E prop diameter should be equal to, about, 25 percent of wingspan. cheers googletranslate
Sir how can I contact u..pls reply me sir..urgent..
Contact me at: abhilashpatel121@gmail.com
Ok thank u 😍
Where is 2D plan?
Refer this: www.instructables.com/DIY-Solar-Powered-RC-Plane-Under-50/
Can you help me to make it
Let me know if you face any difficulty to make one
are you from india
Yes.
👌👌👌