3D print, DLGComments Off on How the Blaster-1 became a E-Blaster
As I mentioned the other day, I decided to turn the Blaster into something Electric. Mostly because I don’t know what else to do with it..
All up weight is now 435 Grams, so that is 81 grams more then without the E. Don’t know how I got the 19 grams earlier. Still happy with it.
The spinner seems to have a slight imbalance, but with a 2S lipo and low rpm it stays together for now. Something to look into later. First we needs some test flights. I also need to think about keeping the prop tight to the fuse. The usual rubber band trick will probably be employed once it flies.
So what’s the plan for launches? Not sure yet, toss it like a normal DLG and hit the motor switch once you release? Need to remember this one has a history, so full power launches will be a bit scary. Anyway, we’ll see.
It actually looks quite nice. Sadly the stab and rudder have some damage caused by a once in a lifetime mini tornado that lifted it and tossed into the fence.
Of course I did the smoke test today. Mounted the motor, connected a 3S battery and hit the throttle.
I ran the Emax 2204 motor for 10 secs before I could fry an egg on it. Hmmm, maybe I should have looked beyond ”it fits”?
An 8*4 prop is not quite the same as a 5*4 drone bit of plastic. No problem, what else do we have in the BigBox of Stuff? Ah, look at that, sort of ancient history here. A HET-RC Typhoon Micro 6/3D. More or less the first motor I got just before the foamy craze started.
Weight : 35 grams
KV : 1460
Max Current : 12 A
Power Nominal : 90 Watts
Recommended Props: APC E 9 X 4.7
The 9*4.7 is what is relevant here. Ok, lets see what E-Calc says:
50 Watt on a 2S Lipo with almost 4.8 m/s vertical performance at 370 gr RTF, and a 5 mins motor run on a 450 mAh battery. Ok, no problem. Lets go!
Getting a bit nostalgic there while looking for the plane with that Typhoon. At the top is my Blaster in good ol’ N-Ireland. It had a variety of radio gear in it, this is I think the Spektrum-Mpx version.
Can’t resist looking back: Yellow Road. With the right northerly you could hang for an hour in the breeze, untill your fingers turned blue. Further back was a similar bowl facing south-ish. That was the better spot. My first flight with the Birdy lasted 30 mins or so.
And I found it! First ever CNC-ed plane. Not a real serious design, just made it, because I could. This was powered by that HET-RC Typhoon. Did fly well enough in the backyard!
While waiting for some parts, I decided to have a go at another project that’s been waiting to be started. I still have my original Blaster 1, RTF is approx 350 gram, and while it was fun flying it from a slope, it always a struggle to throw it higher then 35 meters on a good day. In the meantime I have something black that weighs 220 gram, and does go a lot higher!
That says much about my technique! Anyways, I’m electrifying it. There’s some quad engines lying around, some small Lipo cells that appear to be good enough for a few more flights. All that’s left to do is some radical surgery.
The first cut is the hardest, after that it’s a matter of making enough room for some servo’s and Rx, and somehow getting the CG sort at the right location. As always, I’m using the TLAR technique to get the dimensions right. There’s still a bunch of D47’s from Indoor days gone by, I’m sure I can find a receiver that will do the job, so I’m almost finished, just a matter of assembling a few parts.
I could not find the right size aluminum in my stash, which is a good excuse for doing a quick printed version of a prophub. I have a few 8*4 foldable prop blades, not really fit for this purpose, but I’m not using them for anything else. The first straight center part looks good enough, but then I wanted to have the blades tighter to the fuse. Some headscratchings later I have a fully printed foldable propeller including spinner part. Printing is is just rough and quick proof of concept, not the final one yet.
In the meantime I started preparing the fuse. Those were the days that Vladimir used kevlar for the front end. Real fun when sanding!
Will a printed part be strong enough to hold on to those blades? The answer to the question will have to wait till I assemble the battery. If not, I can always fall back on a proper 5 euro part.
That looks about right! so far 19 grams more then when I started, I need to add some glass around the front end a something to hold the servo’s. Also a small lid to stop stuff escaping. CG used to be at 78.7 mm, 3 mm to go!