Sean Skirvin
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  • Bowling Green, OH
  • United States
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Tandem Rotor-craft

Started this discussion. Last reply by Sean Skirvin Oct 7, 2011. 2 Replies

I am currently working on building a tandem rotor (chinook type) helicopter for use as a photography platform.  Not too far along yet, I have 2 x trex450 clones on the way from China at the moment.…Continue

Tags: trex, mixing, channel, helicopter, chinook

$100,000 Darpa UAV Contest

Started this discussion. Last reply by Stephen Wuest Nov 10, 2011. 8 Replies

Just wondering if anyone else here was entered in the Darpa UAV contest. I am currently working with a few guys on a entry. Basically they want a VTOL uav that can fly 2 miles NLOS(non line of sight)…Continue

 

Sean Skirvin's Page

Latest Activity

Sean Skirvin commented on John Hestness's blog post Nanobeams
"You could make a nice micro CNC router with those lol."
Nov 1
Sean Skirvin replied to Oliver James's discussion 450 Heli UAV in the group ArduCopter (traditional heli) user group
"Another thing to consider too is getting some asymmetrical blades.  They will greatly increase your flight times.  Spinblades are nice (at least I heard they are)."
Oct 30
Sean Skirvin commented on Chris Anderson's blog post Making a helicopter with just one motor/actuator
"I'd always wondered if something like this was possible.  Though I never though of doing it with a fixed pitch rotor (just wouldn't have guessed it possible).  One downside I'd imagine is fact you can only mount payloads…"
Oct 29

Developer
Rob_Lefebvre commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Simplicity?  Yes, absolutely in favor of multirotors.  At least, for fixed pitch electric ones. Security?  Eh... I dunno.  Maybe in the smaller sizes.  Probably not in the larger sizes.  Lots of people having trouble…"
Oct 21
Hugues commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Well Euan, you may be voluntarily missing this point for the sake of other as important ones : simplicity, security, costs, accessibility, ....These are some of the reasons why I would not venture into the heli world."
Oct 21
Euan Ramsay commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Lol - I watched your vid Rob...I knew you'd say that :-) That was a good vid btw - you should do another, or even a series on the pros and cons (including the sums) on each layout? As a "big disc" X8 flyer, it was good to see that…"
Oct 21

Developer
Rob_Lefebvre commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Euan: You are.  You and everybody else. ;)"
Oct 21
Euan Ramsay commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Why do I get the feeling I'm missing a trick by not looking at variable pitch single rotors? :-)"
Oct 21
Steve Strong commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"So I see that there is some talk here and there about what it would take to get Arducopter to handle this sort of control scheme.  Rob, have you gotten anywhere on it?  Or would you care to take a stab at the high level details of how you…"
Oct 21

Developer
Rob_Lefebvre commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Yep. The answer to any rotary aero question is:  "It depends".That's why I try to avoid making overly broad statements.  There are not many hard and fast rules.  At the end of the day it's all about "What…"
Oct 20

Developer
John Arne Birkeland commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"That is true, but then again in a fixed pitch system the propeller hover RPM will usually not be the same as optimal motor RPM/load. Brushless motors usually have a narrow window where they reach maximum efficiency."
Oct 20

Developer
Rob_Lefebvre commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"@John, it's not quite that simple though.  You have to consider that a fixed pitch propeller (of given size and disk loading) will be more efficient in a hover than a variable pitch propeller.  Most of the blades that we use are in…"
Oct 20
Sean Skirvin commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"There are a few other advantages to the tandem rotor system vs a single rotor.  First is there is a lot of area for mounting payloads.  Another benefit is with a center mounted payload, the motors and gears are located over 1 foot away…"
Oct 20
Hugues commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Interesting info, thx."
Oct 20

Developer
Rob_Lefebvre commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"Hugues:  that is a very complicated question to answer.   A traditional helicopter has the lowest frame weight per total disk area.   A tandem heli will have the smallest frame size, per total disk area.  This benefits to…"
Oct 20

Developer
John Arne Birkeland commented on Sean Skirvin's blog post Meet the T1000, 1+hr flight times w/ 1kg payload
"@Huges, a brushless motor system will at the very best have up to 90% efficiency. And there is lots of loss in the propeller also, especially during static hover. So adding more motors and propellers only adds up and increases the efficiency loss.…"
Oct 20

Profile Information

About Me:
Background in wind turbine/composite development and manufacturing .
Please tell us a bit about your UAV interest
Always been interested in building things.
Hometown:
Bowling Green

Sean Skirvin's Blog

Meet the T1000, 1+hr flight times w/ 1kg payload

Posted on October 19, 2014 at 11:33pm 21 Comments

I would like to introduce the DIYD community to my project, the T1000.  This is a tandem rotor helicopter based on T-Rex 450 parts, with custom 425mm asymmetrical blades.  The initial goal for the project (in 2011) was to have a fpv platform that could fly for over 1/2 hour.  I now think we can now achieve a 1+hr flight…

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