|Feb 13, 2015, 11:42 AM|
Joined Jan 2013
Well, it's been a year since I scratch built the MiG Stick. Here's what I've got on the bench now. It doesn't look like much yet, but it's going to be an 90mm EDF trainer with a 59" wingspan. My goal is to have it's flying weight around/under 7lbs. Which will give it a wing loading of around 30oz/sqft.
I'm going to use the 90mm, 1750 watt RC Lander EDF unit that came out of my Nitro Planes Fan Trainer.
I've abandoned the Fan Trainer because it was just a very poor design. Took all the usable hardware out for this project. The problem with the Fan Trainer was that the horizontal stabilizer had negative incidence which caused the plane to porpoise a lot. The main landing gear was too far forward so it was difficult to keep the nose wheel on the ground when taking-off. And if that wasn't enough, it had a 39oz/sqft wing loading. These problems were just plain too difficult to correct, so adios!
If the weight of my trainer does come in around 7lbs, it should give me a wing loading more similar to a warbird. The RC Lander EDF should then give me about 250 watts per pound. It had plenty of power to push the Fan Trainer through the air, so it should have enough power for this plane with its lighter wing loading.
I would welcome any thoughts or comments.
P.S. If anyone can come up with a better name than "Boxjet" let me know...
|Feb 21, 2015, 09:42 AM|
Joined Jan 2013
Boxjet Progress 2/21/15
Here's some pictures of the progress on the scratchbuilt. The nose is starting to look more like an airplane than a boat now. Pretty much the same layout I used for the Migstick. All open in front to allow lots of air to flow through the fuselage.
Check out the batteries. Thanks to Gary Rife for turning me on to the Glacier Lipos. Both of the batteries in the picture are 5000mAh, 6 cell batteries. Check out how much smaller the Glacier is than the Zippy. I haven't actually weighed them but the Glacier feels to be a couple of ounces lighter than the Zippy although it is about an inch longer than the Zippy. They are both 45C discharge but the Glacier claims a 5C charge rate...if I understand it correctly, that would be 25 amps???? That really seems like a lot.
The second picture shows what the Glacier looks like laying in the battery tray.
The third picture shows the wire tunnel and vertical stab support. The trapazoid shaped things are mounts for the horizontal stabs that will raise the elevators out of the wing's wind shadow(??? turbulence from the shoulder mounted wing) and give them a good bit of positive dihedral. It will also serve as a space to mount the rudder servo.
The last picture shows the unfinished side air intakes.
Anyone think of a better name than "Boxjet" yet? I'm still open to suggestions but Boxjet is growing on me.
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