|Feb 02, 2013, 03:05 PM|
CF-105 Avro Arrow 30" Puller
My winter project is a 30" span CF-105 Avro Arrow using a brushless electric puller. Here's the progress to date:
It's got a 3650 brushless outrunner, 1700kv.
Prop will be something close to 6.5x5.5 or 6x6.
Although for initial flights, I will prop it for more thrust, less speed.
Battery is 5S, 3700mah.
Sport Scale 1/20
30" span, 515 sq inches
Almost entirely constructed of 1/4" balsa sheet, which I had laser cut from my own plans (first time doing this!)
Flat plate airfoil with sharp leading edge. Modest leading edge droop on outer panel (not yet seen in these photos). Modest reflex sanded into trailing edge.
I'm hoping to keep all up weight something like 65 to 70 oz.
There's an error in the plans below, each 1/4" balsa sheet is actually 24" x 6"
|Feb 02, 2013, 06:55 PM|
Nice model, Barry! I have Mad Rob's pusher Arrow in the build queue, too. Sounds like it's the same one CF105 has.
+1 on not having too many Arrows flying!
|Feb 04, 2013, 09:28 AM|
The pusher arrow is a nice model!
Originally, I considered a pusher prop layout, but since it was going to be hand-launched and belly-landed, and since I don't like the idea of cutting my fingers, I went with a puller. Then, as it evolved, I thought it was getting too large and heavy for hand launch, so I ended up adding gear anyway. And I just didn't like the idea of an Arrow with fixed gear, I went with retracts.
But, I left the prop up front for two reasons - first, I don't have to worry about clipping it on high alpha landing approaches, and second, the prop wash should help with slow flight control. I also kind of like the "retro" style of a prop-nosed RC jet. They were all the rage in the late 1980s. The next jet I design however, will probably be a EDF.
I'm having a ball working on this thing!
|Apr 28, 2013, 01:22 PM|
I installed the gear and doors. I'll be using a micro servo for each door and use a sequencer. Although the wing appears removable, it's just not glued on yet. Once it's permanent, the battery can be fitted in through one of the open gear doors.
I'm having an issue with the nose wheel, sometimes, after it extends fully, it will not retract again. I may just replace it.
And if anyone is looking for the text for markings, I think this is it - or close enough!
|Jun 05, 2013, 08:05 AM|
I've slowed down a lot on this model. I got distracted building a an old 1980's kit of a Goldberg Electra that was given to me! The CF-105 is essentially complete except installing the electronics. I also think I'm a bit too rusty to fly it just yet. I'll probably try to maiden it by the end of the flying season. Here's the servo install on the Arrow.
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