Justanotherengineer
Junior Member
What should the motor ratio for this plane be? I was thinking 2:1 but is that too small? Too big?
FT 3D - Scratch Build
- Thread starter fliteadmin
- Start date
Hi.
Have built my FT-3D a while back, but did not have good luck flying it. Think was too small a motor.
Just touched it up again and took it out yesterday and found that couldn't get much off the ground with it.
It is set up with the HURC 300 Blue Wonder motor, and I believe even more so now that is too small a motor.
I am weighing in at 595 grams (21oz) with a 11.1 1300 Lipo, and with a 8043 prop.
Seems to be a lot of different motors recommended for this with price range of ~$15 to $50. Any concensus on best cost effective motor to buy (preferably from HeadsUpRC) that will do 'most' 3D maneuvers and that would also be good for the Baby Blender or other similar planes.
Also, I have noticed that several, but not all, FT-3D plane pics in this thread show vortex generators on the wings. I got a kit here and do not have those and don't recall anything mentioned in the build video about them.
Have built my FT-3D a while back, but did not have good luck flying it. Think was too small a motor.
Just touched it up again and took it out yesterday and found that couldn't get much off the ground with it.
It is set up with the HURC 300 Blue Wonder motor, and I believe even more so now that is too small a motor.
I am weighing in at 595 grams (21oz) with a 11.1 1300 Lipo, and with a 8043 prop.
Seems to be a lot of different motors recommended for this with price range of ~$15 to $50. Any concensus on best cost effective motor to buy (preferably from HeadsUpRC) that will do 'most' 3D maneuvers and that would also be good for the Baby Blender or other similar planes.
Also, I have noticed that several, but not all, FT-3D plane pics in this thread show vortex generators on the wings. I got a kit here and do not have those and don't recall anything mentioned in the build video about them.
Bayboos
Active member
HeadsUpRC says your motor can't give more than 500g of thrust under perfect conditions. It's not even the weight of your plane. This motor can power the Baby Blender only because of this plane's superior wing area; but it will have hard time doing anything more than flying straight.
Quick review of the HeadsUpRC page revealed that you should look for the right motor in the 100-200 watts range (perfect for Baby Blender, FT 3D may seem a little underpowered) or 200-300 watts (perfect for FT 3D, while it may turn the Baby Blender into hard-to-control beast). I've build and flown both of those planes, powering them with Emax GT-series motors: GT2210/11 for Baby Blender, GT2218/10 for FT 3D. Those are very powerful and very reliable motors, but a bit heavy and definitely not the only one worth mentioning. I would suggest taking a look on those two:
Emax GF2215/25 950kv
Emax GF2215/20 1200kv
Both will be able to take both planes in the air. The first one will allow FT 3D to do a lot (including hovering), but it will not make it very dynamic. The second one can give much more thrust, but at the cost of noticeably higher amp draw. Note that slow flying/hovering planes usually like lower kv and bigger prop diameter; which is common for both Baby Blender and FT 3D, but may not be the best choice for other FT swappables.
You are right, the FT 3D build video says nothing about VGs, but you can see them on any other video about this plane and also there are markings for VGs installation on the pdf plans.
Quick review of the HeadsUpRC page revealed that you should look for the right motor in the 100-200 watts range (perfect for Baby Blender, FT 3D may seem a little underpowered) or 200-300 watts (perfect for FT 3D, while it may turn the Baby Blender into hard-to-control beast). I've build and flown both of those planes, powering them with Emax GT-series motors: GT2210/11 for Baby Blender, GT2218/10 for FT 3D. Those are very powerful and very reliable motors, but a bit heavy and definitely not the only one worth mentioning. I would suggest taking a look on those two:
Emax GF2215/25 950kv
Emax GF2215/20 1200kv
Both will be able to take both planes in the air. The first one will allow FT 3D to do a lot (including hovering), but it will not make it very dynamic. The second one can give much more thrust, but at the cost of noticeably higher amp draw. Note that slow flying/hovering planes usually like lower kv and bigger prop diameter; which is common for both Baby Blender and FT 3D, but may not be the best choice for other FT swappables.
You are right, the FT 3D build video says nothing about VGs, but you can see them on any other video about this plane and also there are markings for VGs installation on the pdf plans.
Hey All,
Would like to build a FT-3D that is sized appropiately for this motor: Leopard Hobby 3536-6T 1270kv
Specifications:
● KV: 1270
● Lipo cells: 2-3s
● No load current (7.4v): 1.2A
● Max current: 48A
● Power: 445W
● Resistance: .0292 ohm
● Prop adapter shaft diameter: 6.0mm
● Motor shaft diameter: 4.0mm
● Dimensions: 35.0 x 36.0
● Weight: 95g
● Max pull: 1.85kg
● Prop: 9x4.5 - 11x4.7
More Info: http://www.altitudehobbies.com/leop...270kv-brushless-airplane-motor-equiv.-to-2814
http://www.altitudehobbies.com/leopard/3536_chart.htm
What size should I scale the plans to to match this motor? 120%? More?
Would like to build a FT-3D that is sized appropiately for this motor: Leopard Hobby 3536-6T 1270kv
Specifications:
● KV: 1270
● Lipo cells: 2-3s
● No load current (7.4v): 1.2A
● Max current: 48A
● Power: 445W
● Resistance: .0292 ohm
● Prop adapter shaft diameter: 6.0mm
● Motor shaft diameter: 4.0mm
● Dimensions: 35.0 x 36.0
● Weight: 95g
● Max pull: 1.85kg
● Prop: 9x4.5 - 11x4.7
More Info: http://www.altitudehobbies.com/leop...270kv-brushless-airplane-motor-equiv.-to-2814
http://www.altitudehobbies.com/leopard/3536_chart.htm
What size should I scale the plans to to match this motor? 120%? More?
I'm looking scale up the FT-3D appropriately for my larger motor.
Here is was I think I can achieve with a larger version of FT-3d for weight:
AUW of 800g:
Leopard Hobby 3536(~100g)
40amp esc(50g)
servos (50g)
RX(20g)
battery (100g) (~1500mah)
prop (30g)
Airframe(450g).
Thrust to weight ratio: motor can put out 1800g. So with a AUW of less then 900g will give me a 2:1 Thrust to weight ratio which is what most people recommend for 3D planes.
The original:
Wing loading and Wing Cubic Loading:
The original FT-3d has about 250sq in. of wing area and has a recommended AUW of 550g.
Wingloading=12.1 oz/sq.ft.
WingCubicLoading= 9.2
120% of Original
If I make a larger to 350 sq in. of wing area and have a AUW of 800g.
Wing loading=11.5 oz/sqft
WingCubicLoading=7.4
Scale of 1.2 from original FT-3D plans
Thrust to weight: 2.25:1
135% of Original
If I make and even large plane with 450sqin of wing area and a AUW of 1000g
WingLoading=11.2oz.sqft
WingCubicLoading=6.3
Scale of 1.35 from original FT-3D plans
Thrust to weight: 1.8:1
Thoughts??
Here is was I think I can achieve with a larger version of FT-3d for weight:
AUW of 800g:
Leopard Hobby 3536(~100g)
40amp esc(50g)
servos (50g)
RX(20g)
battery (100g) (~1500mah)
prop (30g)
Airframe(450g).
Thrust to weight ratio: motor can put out 1800g. So with a AUW of less then 900g will give me a 2:1 Thrust to weight ratio which is what most people recommend for 3D planes.
The original:
Wing loading and Wing Cubic Loading:
The original FT-3d has about 250sq in. of wing area and has a recommended AUW of 550g.
Wingloading=12.1 oz/sq.ft.
WingCubicLoading= 9.2
120% of Original
If I make a larger to 350 sq in. of wing area and have a AUW of 800g.
Wing loading=11.5 oz/sqft
WingCubicLoading=7.4
Scale of 1.2 from original FT-3D plans
Thrust to weight: 2.25:1
135% of Original
If I make and even large plane with 450sqin of wing area and a AUW of 1000g
WingLoading=11.2oz.sqft
WingCubicLoading=6.3
Scale of 1.35 from original FT-3D plans
Thrust to weight: 1.8:1
Thoughts??
Last edited:
jayz 84
Posted a thousand or more times
Your way over weight for good 3d flight on the stock airframe. I would definitely recommend you bump up the plans to 125% giving you a 40in WS. Youll get Much better flight with your setup. What size battery are you using?
Please re-read the post. I think there was a misunderstanding. That's exactly what I am trying to do and want to make sure that I scale it appropriately for my power set up. The two theoretical options that I have in the post are for a 120% and 135%. Do the Wing Loading and Wing Cubic Loading values look correct for 3D flight capabilities?
Last edited:
jayz 84
Posted a thousand or more times
Ahhh ok yes i did over look a few parts. Lol sorry but sence you are only using a 1500mah the i would recommend the 120% scale. Anything over 1to1 its best i found for sport flying and 1.5to1 is unlimited vertical(crazy power) and 3d flight ( at 120% scale you would do great even up to a 2200mah. Battery) so look over your values seeing you are getting 2to1 on power you will have plenty of power for unlimited 3d flight. Should have no problem hovering around half throttle and crazy punch outs. 130% would even work to if you want more of a floaty type flying characteristics
Last edited:
aerojunkie
Member
In the video when Arron Bates swapped the motor out for the omega 72g, did they continue to use the same 1300mah batteries? I'm building one with a similar motor and cant get my 2200mah batteries to balance right. I don't have any 1300mah to try but will buy a few if they will work better, I do like the almost 2oz less weight with them.
boneheadeh
Junior Member
I finally built the FT 3D after building the nutball and having fun with it!! But I wanted something more that was like what I used to fly.
This is what I used to fly........
And here is the matching FT 3D
Hoping to maiden within the next few days!!
This is what I used to fly........
And here is the matching FT 3D
Hoping to maiden within the next few days!!
boneheadeh
Junior Member
Thank Kurt.
I have a 2212 (not sure if it's the 10 or 13 version as I own both and one is in a gilider), 8x4 dd prop, and 18a esc, 2 9g digital servos and 2 7.5g servos. Almost ready to fly, servos are in, just need to make linkages and its in the air!
I have a 2212 (not sure if it's the 10 or 13 version as I own both and one is in a gilider), 8x4 dd prop, and 18a esc, 2 9g digital servos and 2 7.5g servos. Almost ready to fly, servos are in, just need to make linkages and its in the air!
boneheadeh
Junior Member
Well I finally flew it today! Man was is windy! Also my throws were way too much for a first flight. All and all it flew well, just need to wait for less wind and it all should be good!
Any flight video?
130% FT-3D
I have begun building my 130% FT-3D.
Motor: Leopard Hobby 3536-6T 1270kv Specifications:
● KV: 1270
● Lipo cells: 2-3s
● No load current (7.4v): 1.2A
● Max current: 48A
● Power: 445W
● Resistance: .0292 ohm
● Prop adapter shaft diameter: 6.0mm
● Motor shaft diameter: 4.0mm
● Dimensions: 35.0 x 36.0
● Weight: 95g
● Max pull: 1.85kg
● Prop: 9x4.5 - 11x4.7
More Info: http://www.altitudehobbies.com/leopa...equiv.-to-2814
http://www.altitudehobbies.com/leopard/3536_chart.htm
Goal of AUW 900g:
Leopard Hobby 3536(~100g)
40amp esc(50g)
servos (50g)
RX(20g)
battery (100g) (~1500mah)
prop (30g)
Airframe(550g).
Wing loading and Wing Cubic Loading:
400sq in. of wing area
900g AUW
Wingloading=11.35 oz/sq.ft.
WingCubicLoading= 6.8
Thrust-to-Weight 2:1
It should make for a fun plane as long as I don't fold the wings.
I have begun building my 130% FT-3D.
Motor: Leopard Hobby 3536-6T 1270kv Specifications:
● KV: 1270
● Lipo cells: 2-3s
● No load current (7.4v): 1.2A
● Max current: 48A
● Power: 445W
● Resistance: .0292 ohm
● Prop adapter shaft diameter: 6.0mm
● Motor shaft diameter: 4.0mm
● Dimensions: 35.0 x 36.0
● Weight: 95g
● Max pull: 1.85kg
● Prop: 9x4.5 - 11x4.7
More Info: http://www.altitudehobbies.com/leopa...equiv.-to-2814
http://www.altitudehobbies.com/leopard/3536_chart.htm
Goal of AUW 900g:
Leopard Hobby 3536(~100g)
40amp esc(50g)
servos (50g)
RX(20g)
battery (100g) (~1500mah)
prop (30g)
Airframe(550g).
Wing loading and Wing Cubic Loading:
400sq in. of wing area
900g AUW
Wingloading=11.35 oz/sq.ft.
WingCubicLoading= 6.8
Thrust-to-Weight 2:1
It should make for a fun plane as long as I don't fold the wings.
I was able to get out this weekend to maiden my 130% FT-3D with an AUW of 920grams. It flew great and was super stable even in the 10mph wind gusts. I used 3/32" Music wire for the landing gear and large foam wheels. I can't wait to get some calmer weather and actually try out some 3d flying.
how is 130% ft3d flying? I just maidened my normal size ft3d, and it was pretty much uncontrollable, probably because of it being too heavy and not having cg right. I have 120% spitfire which flies great, and much better than normal size spitfire I had before, so I am thinking of enlarging ft3d in a same manner, maybe even by 150%... or making my own design of extra 330sc..
anyone else tried enlarging ft 3d to 120-200%?
