|Mar 28, 2007, 12:37 AM|
G.T.P. Flying Car
Hi Race Fans,
I am launching a run of kits for a design I've been selfishly toying with since last May 2006. This is a new and improved version of a flying G.T.P. car I originally built as a gag for a foamie contest last May after watching the Rolex 24 Hours at Daytona Prototype races. I liked my original car but it was limited in ways to how it flew... It just went fast and straight. I wanted something I could fly as a parkflyer and something I could have fun with in front of the house. Several revisions tuning the design and the Grand Troy Prototype (G.T.P.) was born. I have had several flying prototypes since early last summer but when friends and folks kept asking for a kit (and I said nah! a few times), I finally decided to get things into production mode... and that part takes longer than anyone ever expects.
First, a general description of the design, flying qualities, and capabilities:
The airframe is a combination of 6mm and 3mm Depron where strength and lightness is needed. It has 3-dimensional structure for realism and to add airframe rigidity. It also uses several carbon tubes and rods to add even more rigidity, including an 8mm carbon motor tube that is stout and easy to do standard 8mm motor tube mounting on many popular CD-rom designs. You will also be pleasantly surprised that it features working front suspension and car-like steering for ground maneuvering. Building is straight forward for those who have built a few foamies. The laser cutting helps jig things up and the instructions are very detailed. There is a detailed part # system to keep track of it all and plenty of pictures.
Flying/Driving: First and foremost, this is NOT a beginner's aircraft. Also, having RC car driving experience has very little to do with what this machine is about. It is an airplane that drives like a car, not the other way around. It falls into intermediate to experienced class. So when Uncle Bob asks to drive it around in the street, say no and site the unfortunate Enzo Ferrari accident with Eddy Griffin. Flying the G.T.P. is a very straightforward exercise and once trimmed out, you will be amazed at how hands-off-stable it is. Being a very low aspect ratio (.7 to 1) it has the ability to have a very fast roll rate. With 400+sq" of surface area, it will also float around and do very tight loops. Inverted flight is no problem and even inverted flat spins are in it's bag of tricks. And yes, it does hover with enough power and skilled thumbs. Once you get it trimmed out, you'll find that you never knew touch and go's, and low, flat Drive-By's (not fly-bys anymore) could be so much fun. I'll be adding some hints and tips for driving and flying along the way. I'll also be adding some design ideas for color schemes and where to get cool graphics. You will be amazed at what you can do with a photo/paint program and an inkjet printer. I also have info on LED lights and may offer a DIY kit for those.
Kit contents are:
-Laser cut 6mm and 3mm sheets. Parts have small tabs which keep them safely locked in place until builder is ready to use them (keeps them safer in shipping and easier to keep track of small, unusual shapes). Slots, tabs, and helpful guides cut into parts.
-Laser cut Ply parts to form higher stress components and control hardware.
-Assorted carbon rods and tubes.
-Wheels with custom axle bushing modifications for smoother roll.
-Custom machined steering linkage.
-Cut-to-length 1/32 music wire pushrods.
-Heat shrink tubing.
-Detailed 15 page Instruction Booklet.
You will need:
-Glue: Polyurethane like Gorilla Glue or Sumo. Foam safe CA ok for tacking together but use Poly-U in corners and high stress areas.
-Masking tape or assembly T-pins.
-Foam Safe paint or markers
-Exacto hobby knife
-Heat gun (for shrink tube)
-Dremel or cutoff saw
-Radio/Motor/ESC/Battery listed below
Surface Area: 404 sq"
Weight: 14.5-16oz/ 5oz sq'
Radio: 4-6 Ch with elevon mixing
Servos: (3) micro servos 12-14 oz torque (Hitec HS-55, Blue Bird 6g, etc)
Motor: 130-150 watt, 45-60g outrunner (Hacker A20, Eflight 370, Axi, CD-Rom double). Motors that will spin a 8X4 to 9X6 HD at ~8600 RPM
Battery: 3S 900-1500 (3S 1320 most common)
Skill Level: Intermediate to Expert
Kit price is $60 plus shipping.
Paypal ok. PM me to place order.
Kit Availability 3/29/07
Kits available to ship. The production is ramping up and I will keep you posted on quantity available.
|Mar 28, 2007, 06:49 AM|
Joined Jan 2004
WOW , Troy
LOVE THAT model, I need the Ferrari scheme as my brothers a open wheels nut.
Excellant work,,,,,,, looks like a perfect match for my eclectic airshow fleet.
I'm already cramming the numbers and see my goal sub 12oz.
130w-150 watts on a GWS turning the 8X4DD is easily done with 23g single motors @ 14 amps on 910 TP packs.
Have you tried the 7X3.5 prop? it gives faster in air speed versus low end torq.
a tad more thrust as well.
NO plywood on my models strictly c/f and heatshrink knuckles.
Delast c/f/clamp band motor mounting system
3 Polk Hobby 4.7g servos this includes wires/plugs.
Plugs and wires tricks..... ie no bullets.
Got 3 more models to get together for SEFF, at least I know next years SEFF 08 DVD cover......
3 hydro's, a missile, a grand prix car, all hovering are'nt electrics fun.........
|Mar 28, 2007, 11:07 AM|
I've played with the lighter motors (25g range) and it comes down to a CG issue more than a power issue. Unlike the boats, there is nothing of substantial 'girth' forward of the CG other than the motor, battery, and the wheels. So, leverage is not on your side there. My buddy did use a LS Purple Peril on his with an extended motor tube and we still had to add some nose weight. You would have to extend the battery and motor mount forward which can be a little tricky. Considering its size, 14-16 oz is not a big deal and it seems to fly well in 'normal' outdoor conditions where there is inevitably a little breeze. But having said that, I do think it can shave some weight if you are careful. Just like in the car world, I hope to find many Tuner-Happy folks who want to trick their ride.
I'll start getting some build pics uploaded tonight. I had gone back and added some improvements prior to the latest Laser-Cut session to ease assembly and to fine tune a couple spots so I'll have to make a few side-bars along the way to explain the added features.
|Mar 28, 2007, 04:40 PM|
Joined Jan 2004
Ahh, I see,
Not gonna move motor know what that does.......
Just a quick thought a pair of TP 730 3s one for each front fender nose.
130W-150W is a little lite to hover recover 14-16oz,
In the video the one is hovering nicely, what is that the Double Ccdr, what prop? what amps, what weight?
|Mar 28, 2007, 05:25 PM|
GBx™ Brushless Outrunner Kit Double Stator: Link
11Y 24GA (may be 22GA) wire, 9X6 GWS HD prop, 8650RPM, 14.6amps on 3S-1350TP
The prop is a cut down 10X6 GWS HD to 9", and the wire I believe may have been 22GA because it took me about 3 times to eventually get 11Y winds on there. 10Y was pulling over 20 amps...
|Mar 31, 2007, 10:40 AM|
I'm one of the lucky ones to have one of these flying. It's a lot of fun to fly and the awwwwwhhhhh factor from watching it exceeds that of my 3D planes. It slopes great too. It took it to Carlsbad last week and it was up for a good 20 minutes in light winds. The best part was when I flew it low it looked it the car was driving on top of the water. Great work Troy, now I cant wait to finish the next one for my dad.
|May 01, 2007, 11:52 AM|
I have posted some new vids of the GTP: http://www.rcgroups.com/forums/showthread.php?t=663379
I am gearing up for our local MWE Spring Fling and plan on having a contingency of cars at the event. I've got several folks flying or building one who will be attending. I flew there on Saturday and the runway is ripe for some drifting.
|May 02, 2007, 09:06 PM|
Fits right in....
The G.T.P. will fit right in with my racing and flying. Some pictures of my 1/10 gassers and my Graupner boat. The 4tec 3.3 does over 70mph and the little 1/18 Assoc. street buggy with a mamba 25 and 8000 kv motor does over 50 mph.
This should fit right in. Can't wait to run it down the track and take off. STRINGFLY <>+++++
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