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Aerospacer's blog
Posted by Aerospacer | Jun 26, 2014 @ 11:43 PM | 2,400 Views
I started this project last fall but winter closed in with a vengeance, so I left it to finish this spring. But then my club decided to put in a hard surface runway on our field, so much of the spring was devoted to that.

When I'd left off last fall, I was just about to detail Park Flyer Plastics canopy kit I got for it along with the belly pan. I also took the suggestion that Keith Sparks of Park Flyer Plastics when he modified his Stinger. I cut a hatch in the turtle deck to allow the receiver to be mounted up there and clean up the wiring.

The stock ESC for the Stinger 64 HP is physically very large and tough to place in the fuselage behind the battery. So I used an old Castle Creations Phoenix 45 and added a UBEC to handle the servos/Rx off the 4s battery voltage that the Phoenix 45's on-board BEC isn't rated for.

Today, I made the first flights with my Stinger 64HP. I used a 4s-2200 mah battery. The all up weight was 29 ounces (820 grams) surprisingly quite a ways north of the 600 grams listed as the max for the Stinger on Hobby King.

I had the CG set between 60- 70 mm back from the leading edge reference shown in the manual. On the first flight it exhibited many traits of being quite nose heavy. Needed up elevator trim, almost full down elevator to fly inverted and almost full up to pull through the corners or the down side of a loop.

So for the second flight, I moved the battery back about 1/2" back from the front of the compartment but it didn't help...Continue Reading
Posted by Aerospacer | Feb 19, 2014 @ 09:42 PM | 2,268 Views
Living in Minnesota on a lake no less, I've spend a good portion of my 30+ year RC flying with float equipped planes. Once I made the full transition from glow to electric powered, I went from just a couple ROW aircraft setups to about a half dozen. Last summer was the second season with a particular favorite of mine on floats, the Parkzone Wildcat. After I got a hold of the TH Hellcat, it just had to go onto floats.

When I was zeroing in on floats for the PZ Wildcat, I was quite familiar with the ones that Multiplex provides for their Mini Mag. These floats are one of the more nicely engineered that I'd come across for light electric aircraft. The Elapor foam that Multiplex uses is very strong, light and smooth surfaced. These floats are close to what I thought would be an appropriate size for either the Wildcat or the TH Hellcat. Technically, they are a little shy in length but I found their water handling under the Wildcat was still excellent. The TH Hellcat's metrics are very similar to the PZ Wildcat so why not go with a proven setup for the Hellcat.

To start off with, I have always added a little more durability to the Multiplex MM floats by covering the bottoms with packaging tape. To prep them, I lightly sand off the mold nibs and fill the hole behind the step where the mold fill plug depression is. Then wipe them down with some lacquer thinner. My supply of packaging tape is all in 2" width rolls, so I cover with multi-strips across the bottoms. I...Continue Reading
Posted by Aerospacer | Nov 28, 2013 @ 10:12 PM | 2,333 Views
After seeing a couple of these flying back in October at our indoor venue in the Minneapolis HHH Metrodome, I did some more research to find out if they were possibly a hidden gem of park flyers. Of course I found an extensive review thread in RCG's eZone started by Jon Barnes back in March of 2010. I was almost dissuaded from getting one by all the negative posts on the durability of GP's version even before you could take it out the the box.

Then one of my fellow Metrodome fliers let me take his up for a few circuits around the Mall of America Field and told me that they aren't all that fragile. Always wanting a Tiger Moth since seeing the GWS version fly in the Metrodome many years back, I pulled the trigger on an order from Tower Hobbies.

Since this was primarily going to be an indoor and calm weather park flyer, I didn't want to more than double the investment by following the GP recommendations for electrical bits to complete it. First off, I already had a Castle Creations Phoenix 10 ESC and a couple of small 2S lipo battery packs. So I needed only servos and a motor. I decided to shop for them at Value Hobby because they had a close match to the Rimfire 250 outrunner motor in their G-Force 2204-1800 KV and so I added to that 3 of their digital 6 gram Power HD servos and a 8x4.5 SF prop. Those together were less than a Rimfire 250 motor from Tower Hobby.

When the Tiger Moth parcel arrived from Tower and I opened the box it was amusing to see the caution card...Continue Reading
Posted by Aerospacer | Nov 08, 2013 @ 10:12 PM | 3,493 Views
For the indoor flying season here up north, we break out the micro aircraft in our fleets. After flying mostly larger aircraft all summer with multi-cell LiPo's, it can seem that by comparison, we are running blind when it comes to the battery condition you can discern on the typical equipment available to maintain the small single cell LiPo's.

One of our electric flying association members came across a neat component to help out with that problem. It is a small 3-digit self-contained digital voltmeter module that can be obtained for less than $3 each. He obtained 100 of the digital display volt meters for our members to build a tester that he designed. These are available on eBay from a multitude of sellers such as item # 360713999468 from axeprice which is identical to the ones we are using.

The voltmeter is 3-digit display auto range that measures up to 30 volts and requires from 3 to 12 volts to power it. So it is well suited to either the 1S/3.7 volt or 2S/ 7.4 volt LiPo's we use in the typical micro aircraft. With the addition of some suitable load resistors and switches, you can have a tester to measure battery voltage under load to determine if your batteries are capable of delivering the capacity required.

To increase the versatility of this tester, I added some features to the basic design. A second connector that allows me to tie in one of the basic 1S chargers for monitoring voltage during the charge and an isolated input to measure batteries up to the...Continue Reading
Posted by Aerospacer | Oct 06, 2013 @ 02:51 PM | 2,574 Views
This aircraft will be my 5th EDF aircraft. Got it because I saw a local pilot who is a skilled aerobatic flyer doing very smooth maneuvers with it. Mine is purchased from Motion RC.

Initially, I planned to throw it together quickly and get some flying in before the fall weather here in Minnesota got too nasty. But as I am want to do with all my aircraft, I began to get picky after I encountered a problem with the horizontal stabilizer. The elevators were severely hinge-bound. I found that the plastic pivot hinges that supplement the live foam membrane hinge were over glued to the extent that glue flowed into the pivots and locked them up tight.

I contacted Motion RC and they quickly sent me a whole replacement tail package (both horizontal and vertical tail). The replacement horizontal stab had the proper amount of glue for the plastic hinges but was still somewhat hinge-bound. Turns out that both examples I had (and I'm presuming all of the horizontal stabs) are built with the outboard plastic hinges set too deeply into the surface so that they are off line from the flex line of the foam membrane. Whereas, every other plastic hinge on the rudder and ailerons are properly located.

Meanwhile, I'd have to extract the elevator servos from the over-glued stabilizer and transplant them to the replacement stab. The servos themselves also had so much glue in their pockets and didn't lay down fully which in turn kept the stab from seating properly on the fuselage.

At...Continue Reading