Help! su 37 prop jet canard control for high AOA flight

[badpilot27]

I am planning to make a su 37 prop jet soon and I am a bit mixed on how i should control to canards. I want the plane to be able to do some high aoa maneuvers such as a cobra or a falling leaf. I'm a bit spit on having the canards move in the same or opposite direction as the horizontal stabilators.

 

[L Edge]

When you pull up on the elevator, you want the tips of the canard to go up also. If you put 2 servos(one on each side) for the canards, it will actually be another set of elevons which help movement to do high AOA and acrobatics. You will have to explore how much deflection up and down movement(3 crashes high) is best for you. Also have a switch so that if needed, you can shut them off.

Got a video using a F-22 with canards as elevons.

 

[quorneng]

If you are not clear on the way a canard surface operates are you sure you should be trying to build an SU 37?
Remember many canard fighters rely on electronic stability to perform high AOA manoeuvres.

 

[NickRehm]

Oldie but a goodie:

What you probably want to do is slave the canards to the elevons so that when the trailing edge of the elevon goes up, the leading edge of the canard goes up. This creates the same control moment, just on opposite ends of the cg. In very high alpha, Dave hits a switch to re-orient the canards to be more into the incoming wind so they are not fully stalled anymore.

 

[badpilot27]

almost done with the design

anyone know how to convert onshape files in to printable foam board plans?

 

[Mr Man]

almost done with the design

View attachment 250108
anyone know how to convert onshape files in to printable foam board plans?

Yup, in the bottom right hand corner there is a protractor, click that and then select "flatten surfaces" select a face, flatten and then export in dxf or svg.

 

[badpilot27]

Yup, in the bottom right hand corner there is a protractor, click that and then select "flatten surfaces" select a face, flatten and then export in dxf or svg.

do you know how to tile a dxf or svg in onshape? if not what should i use to tile the image so i can print it

 

[badpilot27]

"3d thrust vectoring"

 

[Mr Man]

do you know how to tile a dxf or svg in onshape? if not what should i use to tile the image so i can print it

No I don't, but I'm pretty sure there is a way, but I don't know it. What I normally use is Adobe Reader (the free version) as it'll tile large pages in the "poster" option.

 

[badpilot27]

No I don't, but I'm pretty sure there is a way, but I don't know it. What I normally use is Adobe Reader (the free version) as it'll tile large pages in the "poster" option.

im having some trouble accessing adobe reader. I try downloading it and it keeps taking me to acrobat before asking me to pay for a subscription. Im not really sure what im doing wrong but here are the .pdf files for the plans (non tiled)

onshape file here

 

[AIRFORGE]

im having some trouble accessing adobe reader. I try downloading it and it keeps taking me to acrobat before asking me to pay for a subscription. Im not really sure what im doing wrong but here are the .pdf files for the plans (non tiled)

onshape file here

Be sure you're trying to download Acrobat Reader Free.

 

[badpilot27]

Be sure you're trying to download Acrobat Reader Free.

it says i already have adobe acrobat reader installed but when I look up reader in the windows search bar nothing shows up. I then just tried opening adobe acrobat and asked for the subscription payment and if i click cancel it just closes out the adobe acrobat window.

 

[Mr Man]

I might tile some for ya tomorrow, as long as I have the time.

 

[L Edge]

"3d thrust vectoring"
View attachment 250127

Here is a video of the canard elevons working. As you can see, I am pushing the limits of high alpha(close to stall) and doing acrobatics. It takes throttle management to control the rocking.

Noticed you are trying rudder inside the channel. What is the dimension of it?
I designed a version using a 9 by 3/8 prop setup and had to add a rudder above the channel as well as the bottom. Later, I designed the "udder rudder" which I can incorporate in front of a prop or behind the prop to give it yaw ability especially in high crosswinds.

 

[Mr Man]

@badpilot27 Here Are the Tiled Plans!!

 

[badpilot27]

Here is a video of the canard elevons working. As you can see, I am pushing the limits of high alpha(close to stall) and doing acrobatics. It takes throttle management to control the rocking.

Noticed you are trying rudder inside the channel. What is the dimension of it?
I designed a version using a 9 by 3/8 prop setup and had to add a rudder above the channel as well as the bottom. Later, I designed the "udder rudder" which I can incorporate in front of a prop or behind the prop to give it yaw ability especially in high crosswinds.

the rudder inside the lower fuselage is about 1.5in long and a little bit under 2in tall

 

[badpilot27]

@badpilot27 Here Are the Tiled Plans!!

yo thank you so much.

if you want to build one please do because I kinda want some feed back on the design. its intended to use a 6in prop. Im not too sure how im going to link up the servos but I know there is going to be 1-2 servos for the canards, 2 for the elevons, and one for the rudders.

I might start building tomorrow.

 

[badpilot27]

just wondering would a 2200kv motor with a 2 blade 6inx4.5in propeller on 3s have enough power for this? should I get a 3 bladed prop?

 

[Piotrsko]

Take all the pieces and weigh them. Look up the specs for the motor/prop combo and see if that makes more estimated thrust than your pile of parts weighs. If yes, then it will perform as advertised otherwise you need to do speed to lift conversions inflight

 

[badpilot27]

Take all the pieces and weigh them. Look up the specs for the motor/prop combo and see if that makes more estimated thrust than your pile of parts weighs. If yes, then it will perform as advertised otherwise you need to do speed to lift conversions inflight

just weighed it, its about 580g and I looked at a thrust chart for the motor im using and apparently its about 732g

also heres a tail control surface test vid

video link here