Posted by JimL |
May 24, 2013 @ 10:09 AM | 2,508 Views
Floats for E-flite Edge 544QQ 280 3d plane
Below are pictures, a video and instructions for the floats.
These floats are based on a design by jimsp for the Champ. They are scaled up to 18 inches for the Edge.
Floats are made from 1/8” foam board from Dollar Tree. The 7 pieces and brace are cut, and the paper backing is stripped from both sides. The pieces are glued together as the attached drawing shows with glue such as Gorilla Glue or another waterproof glue. When dry, sand to final shape.
The back of the floats (behind the step) are angled up ˝ inch for water clearance on takeoff. The brace helps to hold this angle.
They are 18 inches long and weight 1 5/8 oz with rear landing gear. Use the planes forward gear without wheels for the forward mount. Gear can be secured with short pieces of wire insulation.
The float spacing is 7 ˝ inches center to center with spreaders made from skewers. The step is the main reference point. When complete the center of gravity of the ready to fly float plane should be about ˝ inch ahead of the step. The location of the foreword landing gear attachment determines this. It came out to 2 1/8 inches ahead of the step, but check this location before gluing in the mount.
The wing should have about a 4-degree angle of incidence with the floats resting ‘on step’ (for symmetrical wings like the Edge). Adjust this by the height of the rear landing gear. Attach rear gear with Velcro for easy float removal and change back to wheels.
Cover the bottom of the floats with packing tape to reduce water friction and to help strengthen the floats.
12# monofilament fishing line works to brace the floats front to rear (see picture) to stiffen up the mount.
The floats work well and hardly affect the performance of the plane. It is still capable of 3d aerobatics.
Posted by JimL |
Dec 04, 2008 @ 04:09 PM | 3,142 Views
Used a Garmin eTrex Venture HC gps unit. It has memory to hold data. Set it up to take a data point every second. It stores data like latitude, longitude, elevation, and calculates actual speed and ground distance between each data point. This data is plotted below.
The test flight has 3 WOT speed runs, lasts about 2.5 minutes and covers a distance of about 7000 feet over the ground.
The gps track over the ground is plotted on the satellite photo. The x marks the start of the flight. Took off to the south, turned for a level speed run (about 55 mph) to the NNW, turned at the road and gained some height for a shallow dive speed run ( about 55 mph) to the South, then a climb (the figure 8 thing to the south), then a steeper dive speed run (about 10 degrees and 70 mph) to the NE, then a looping turn on the far north end and back to land to the south.
The 2 charts show speed vs distance and elevation vs distance. The charts line up so you can see speed increase as altitude decreases during the speed runs. The 3 speed runs are marked. From about the 5000 ft distance to the end of the flight the motor is at idle while gliding down to land.
The plane likely will go faster than 55 mph on the level run, but the gps added 5.5 oz of weight and I had to mount it under the wing (see picture). Also the plane has taken battle damage, has a slightly bent motor shaft, and extra weight of glue from repairing a couple fuse breaks.
The flight was a little erratic, very sensitive to controls maybe due to added weight or some change in CG. I wanted to do a little steeper dive but I was afraid to.
edit 12/18/10 now have the T28D after too many repairs to the red & white Navy plane.
I use the stock plane with the stock 7cell NiMH battery.
I also use the T-28 3s 1800mah lipo battery with the GWS HD 10x6 prop. I cut out the front top of the battery box and moved the esc/rcvr to fit this battery vertically. Remove the jumper #3 on the esc when using the 3s lipo. This lipo adds an amazing amount of power and flight time.
The plane will row in about 30 feet with the 7 cell NiMH and much quicker with the lipo.
Float Gear: For the front float gear use wire bent like the landing gear to fit in the slot. For the rear gear mount use a velcro attachment for ease of removal. Gear are mounted to the floats so the planes cog is located ˝” ahead of the float step. Float separation is 10” on center. The prop should have about 2” of water clearance.
Also recommended is to have the floats mounted firm. To do this I ran 20# monofilament fishing line from the lower part of the back gear up around the top of the front gear. Also a piece from the lower part of the front gear up around the top of the back gear. With these lines under a little tension it makes the...Continue Reading
Posted by JimL |
Jun 29, 2008 @ 12:43 PM | 4,523 Views
Been searching the internet for aerobatics to fly with the T-28. The attached is a summary of what I found.
I’ve tried all of these except the rolling turn. The T-28 does them well though I still need lots of practice to get them to look good.
Here is a video of these
If you are new at this, try them 3 mistakes high, it can be hard to recover if you goof up trying to come out of these maneuvers. I have crashes to verify the need to try them high.
It is best to think through the maneuver and how control surfaces and throttle should be at each point in the maneuver before you enter the maneuver.
If you look on the internet you can find info and videos of some of these. A good one for the barrel roll is this one of a Navy training film using a T-6 Texan: