|Servos:||1 - Hitec HS81, 2 - Spektrum DS821s.|
|Battery:||Common Sense RC 15C 3S 3000|
|Motor:||Common Sense RC E25|
|ESC:||Common Sense RC Z45|
I always gravitate towards aircraft that are different or unique; something that more than likely there will not be three or four of at the field on Saturday.
One type of aircraft that fits this description is the autogyro. I always thought they would be fun to fly, but I assumed it would be hard to set one up. When I came across the CAD designed and CNC manufactured PT Profile Autogyro, I jumped at the chance. It proved me both wrong and right all at once!
The kit arrived in great shape and with no missing parts. Itís a built up kit and requires some building, but with the profile fuselage and the prebuilt rotor blades it requires minimal effort and can be up and flying in short order.
The PT Profile kit includes:
Items needed to complete the PT Profile Auto Gyro:
Since it is CNC manufactured, the tolerances are very tight making for a great build. The PT goes together fairly quickly for a traditional balsa kit. The low parts count, extremely detailed manual and reference drawings along with all hardware and wood make this a delight to build. This is obviously a very well thought out kit.
The kit is begins with the subassemblies - the horizontal and vertical stabs - which are already CNC cut for you. All that must be done is to glue the fixed elevators to the horizontal stab, and then cover with your choice of covering. I went with Doculam because it accepts paint easily.
The vertical stab and rudder must also be covered, and then the rudder must be hinged to the vertical stab.
The fuselage build is very straightforward and consists of only 12 parts of both balsa and light ply. There is a ply firewall, landing gear mount, fuselage, tail doublers and the fuselage "T" beam. The balsa parts are the fuselage, pylon cores, fuselage, 3/8" and 3/4" triangle stock.
The fuse can easily be built up in an hour or two. The central "crutch" is built upon with the doublers over top of the included full size templates.
The rotor hub must be built up from the included kit. This is where the numbered drill bits are needed. I picked up this set from Harbor Freight. There are several holes in the flex plate and rotor hub that need to be drilled at different sizes. To make this step as foolproof as possible, I color coded the reference sheetís different sizes to be drilled. I laid the flex plate over the plans and color coded it as well. I wound up with all the correct sizes drilled in the correct locations! The reference sheets that come with the kit make this step very simple. I had not built anything like this in the past, and found it a very welcome change of pace.
The rotor blades are already prebuilt, and all I needed to do was to cover, install and balance them. To balance them, I laid the gyro on the kitchen table and watched the rotor spin to find out which of blades were heavy (the heavy blade will tend to "fall" to the bottom) and then added weight to the light blades. The blades are balanced when it is possible to put the rotor in any position you want and the head remains stationary.
FlyingBalsa.com recommends a 300 watt power system, so I went with the Common Sense RC E25-12 motor . With the E25 I also installed a Z-45 ESC and have been flying on 3S 3000 15C packs. On an APC 12x6E I am making around 480watts at 47 amps. I have since propped down to an APC 11x6E.
The motor mounts to the firewall using the stock motor mount centered on the firewall using the provided pilot hole.
The tail section that was built up earlier must be installed onto the gyro, and then itís on to the gimbal. The gimbal is held to the pylon via a 3/32" pivot wire, two washers and two 3/32" ID wheel collars. I ground a small flat spot with my Dremel on the wire to allow the wheel collars to seat. I also, just for my own "I feel much better now" reasons, added a third 3/32" collar to the wire just in case!!
The rotor blades and tail surfaces of the PT must be covered and/or painted. FlyingBalsa recommends painting the fuselage, gimbal and head. I covered my blades in White MonoKote and used Krylon rattle cans to paint the rest of the aircraft. Once I had the fuselage built up and ready to go, I prepared to paint it. I pulled the rotor blades off the gimbal and prepped the fuselage.
Once painted, I installed the landing gear legs and rotor blades. I have found that for general maintenance, it is much easier to work on the gyro with the rotor/gimbal assembly removed.
The servos are held on to the side of the fuselage. In order to get the strongest setup, I bought some aluminum 90* angle stock and cut servo mounts out of it; very simple, very cheap, extremely effective. There are some servo brands that manufacture these, but since I used a servo that did not offer these, and I did not want to wait for another set to be mailed to me, I made some.
Once the servos are installed, the pushrod tube for the rudder servo must be routed. The pushrod is held to the fuse through three control arms that have been reamed with a 1/8" drill bit.
Once the entire flight pack is installed, the "CG" must be attained. CG on the PT Profile is found via hang angle. When held from the "rotor mast", the fuselage should sit at a 5 to 10 degree angle.
The ďPTĒ in PT Profile stands for Primary Trainer, and that is exactly what it is for autogyro hopefuls. I have always had an interest in autogyros, but prior to this review I have never flown one. Once I got it into the air, I was excited about what this aircraft held for me.
The PT flies like a dream, and I have fallen in love with it. I knew as soon as the PT broke ground I was going to enjoy the gyro immensely. I found myself repeating "I cannot believe this thing is flying!" It will fly extremely slowly or fairly quickly. Loops and rolls are even possible! It is a wonderful "Sunday flyer." I am completely hooked on autogyros.
As I was researching flying autogyros, I kept reading about orientation. Seems everyone who has flown a gyro has battled this issue. While flying an autogyro is not difficult, keeping proper orientation of the aircraft can at times be challenging. I read about the orientation challenges autogyro pilots have, and I wondered what makes it so difficult. If a single picture is worth a thousand words, then 4 pictures must be worth well, four thousand!
The issues with orientation are not PT Profile specific. It is due to the "change in aircraft structure" I believe, that makes it hard for our eye to determine, exactly what our aircraft is doing, where it's heading, etc. This is also an issue with helicopters. After a handful of flights the issue lessened as I began to get accustomed with the profile the PT showed me.
The PT can be hand launched or will rise off the ground. I preferred to perform traditional take off run for the maiden, and I have since found that I much prefer this method to the hand launch. The proper method for a nice take off is to allow the rotor to spin up fully while holding up elevator until the gyro is ready to fly, and then release the elevator slightly, and allow it to rise off the ground. Nice, smooth take off runs are so much fun with this bird.
To land, with the rotor spinning, point the gyro into the wind and bring it in at an absolute crawl to set the gyro at your feet.
Prior to this build I was a complete novice to aircraft that slung their wings over their head and especially to auto gyros. I am totally thrilled that I gave the PT Profile gyro a shot!
If you are in the market for something different that is as unique at the local flying field as it is fun, I suggest you give the guys at FlyingBalsa.com a visit and get a PT Profile on the way to you!
|Sep 11, 2008, 10:20 PM|
Great job Tram!!!
I've been tinkering with autogyros for a couple of years now and love them!
You'll have to come on down to Tuscaloosa soon and give us a demo!
|Sep 11, 2008, 10:28 PM|
Dude, if you want one, this is the one to check out.. I absolutely love it..
I recently crashed it, but am working on getting it back going.. Just waiting on some parts to arrive..
|Sep 12, 2008, 01:15 AM|
Nice review Tram. I'm just trying to find out the best way to inform my wife how much I 'need' one of these things. I have played the 'need' card a whole lot this year, but darn it....I 'NEED' one of these!
I actually had some limited fun with the little Air Hogs Autogyro this past year. It sure made me interested in getting hold of a real one. This one sounds good!!!
|Sep 12, 2008, 03:36 AM|
I have always sooo wanted a gyro but have been a little afraid of the flight reports I read.
Have you tried hoisting a camera with it?? Do you think it would be upto it??
I'm quite into aerial photos, the into wind slow speed appeals. (I know those winds can be pretty strong as well and it should cope)
|Sep 12, 2008, 06:36 AM|
Buzz- Nice looking bird!
Ken - just buy her some shoes!
Mike- I can run it up when I get home, I don't remember off the top of my head.. The gyro is down right now.
Gary- depends on the camera.. It will fly the FlyCamOne without any issues..
|Sep 12, 2008, 12:35 PM|
The guys at www.flyingbalsa.com do an excelent job with their kits and make sure you will succeed...great customer service.
Here's my PT-profile, slightly altered.
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