The flying monkeys got me...

Helis, Fixed Wing, RC Sailing

AMA 957918

Pirate Kid Skeleton by RadDezigns.

Saturday, May 3, 2014

A Very Excellent Day!

Aidan and I headed out this morning for a date on the MCRCC flightline, looking to maiden his Alpha Sport 450 and my PulseXT 25e after a breakfast of southerner at Das House of Waffles. It was a spectacular day!

 

The Alpha flew tail heavy, which surprised me for two reasons. Firstly, despite telling Aidan we needed to check CG I completely forgot to do it, and secondly, this is not a tail heavy plane. I ended up putting an ounce in the nose. So the first flight was brief and I had to land cross field because I didn't feel like dealing with the cross wind, and at the last minute her upwindish wing tossed up a bit. Rough landing, no damage.

In setting up the weight we pulled a loose solder out from the EC3-EC5 adapter I had made out of an old EC3 battery lead. The solder was about 4 years old... I hadn't brought my soldering torch, and at first thought all was lost, but McGyver Me used the clubhouse electric stove to heat the remaining solder in the bad EC3 pin, and voila, fixed it after a couple of tries. I noticed the motor clicking, but couldn't figure out what was up, it otherwise ran fine. We got the plane up and Aidan got to make a few runs on it before we brought her back in. I still heard the clicking and inspected the motor, pulling on the prop. It was then I noticed the brand new Eflite 450 motor's rotor (the can) was pulling off the stator by a good quarter inch. I didn't have a hex driver small enough to fit it, nor did anyone else on the field, so that ended the flight day for the 450. In the meantime we put the bigger tires on her since the stock ones were tripping her up in the grass.

When I got home I removed the motor (none of it was locktited), reset the back "rotor holder thingy", a wheel lock actually and tightened it with some locktite. I reset the stator and replaced the SAE lock nut with a metric as it was stipped in the frickin' lock hole, which is why it slipped, and snugged it all in with locktite. Put it all back together with locktite and gave her a spin up. Ran great, click was gone, rotor stayed put on the stator. I'm going back out tomorrow wx permitting and will fly her through a proper maiden workout; we'll see if I have prevailed over the wayward stator.

 

 

I maidened PulseXT 25e #4 today! She flew perfectely as designed. I wasn't feeling lucky, so I put her away after that first flight, but will fly the snot out of her tomorrow!

Ended the day with a nice flight of the Sbach 70, took her through the first aerobatics I have flown for some time, and she did marvelously. it is a distinct pleasure watching her unlimited vertical at high speed. I landed her after 4 minutes, having flown her on a 6S 3300, and the battery was down to 3.7 per cell... This is disappointing as I was getting 6 minutes to that level on 2 x 3S 2560 in series... Tomorrow I will put a 4000 in her and see what time I get. I think putting her on the ground after 4 minutes will be safe until I get a better feel for the run time. 4 minutes sucks... And I flew most of that at half throttle (at which she still hauls ass). After one flight I was done... Spent too much time farting around with fixing the 450.

Good Guy Jerry Gollot, who taught me how to fly, took Aidan up on his 40 sized nitro trainer. Aidan made several turns, getting a feel for how an airplane flies and turns, learning the nuance of a little elevator in a turn, and a light finger on the sticks. He did pretty darn well and of course I failed to take a pic...

All in all, a very successful day! Looking forward to getting out there very early tomorrow and flying before the winds pick up!

 

Sunday, April 27, 2014

Pulse XT25e #4 Flight Ready!

I finished the replacement Pulse this afternoon, completing the motor and electrical system installation, the receiver, installed the canopy, and the wing. I programmed the transmitter and voila, done!

Earlier I power tested the HeadsUpRC Power 32 (rated for 800 watts) with the HobbyWing FunFly 60A ESC using a 4S 3300 mAh battery and an APC 12x8e. The peak wattage was 820, running nominally on full throttle at 740 watts. She drew around 45A Sweet spot. I had tried a 12x6 Xoar, and it RN fine, pretty close to the same numbers, but a bit less power and thrust. I left her with the 12x8.

 

On inspecting the motor, I found that one of the power couplings was not connected. I wonder if this contributed to the crash... I had applied power and got at best a mushy response. I decided to resolder all three. I also lubed the bearing.

 

Resoldered and shrink wrapped.

 

Motor in place. I decided to put in one thin washer to give a smidge of right offset.

 

 

 

 

Welcome to Pulse XT25e Number 4!

Looking forward to maiden flight sometime this week, when the weather settles in!

 

Saturday, April 26, 2014

PulseXT 25e #4 Arrived Today!

 

The latest replacement PulseXT arrived today via FedEx! I love Horizon Hobby! I've half built it already, this being my fourth frickin' one...

 

Stopped for the night. Looks like SkunkWorks, and it's actually hiding my plane, even down to the Dixie cups covering the wheel pants, from my frickin' cat, who like to chew the corners of my planes. Well one does (we think it's Neko... I have three Siberians, two who love us and one who clearly tolerates us). Tomorrow, wings and servos, canopy, and power system is all that's left! Weather will be sucky the next several days so. I am unlucky to get to maiden it for several days.

 

A Good Day!

Nice weather conditions lead to gentle morning winds. overcast, mostly cloudy with spotty sunshine breaking through. Got three flights in on the Sbach, all fun and lacking in troubling excitement. I flew very basically, a few simple stall turns, Cubans and inverted. she flies sweet in all orientations. Concious of my poor orientation feelings last time I was extra attentive today. One hard landing as I get used to her floating in ground effect. I really want to get awa from spoilers. She doesn't peel off speed well, though you can hear wind whistling through the free turning 17" prop as she comes in off power over the threshold.

Decent flight times. Got easy 6 min from both the 4000 and 3300 mAh batteries, not seeing a reason to go bigger and wonder if just flying 3300's is the way to go? Lighter battery, adequate flight time.

Met Kelly who came over with his son from the soccer fields. They had seen the Sbach and had some free time so dropped by and got a nice welcome from me and John, who himself is a frequent visitor from Florida. John was flying his Revolver (why didn't I think to get a pic?). I had Aidan's 450, but he hasn't flown it yet and I wasn't going to fly it without him. He slept in today.

A couple of days ago I filed for Aidan's AMA license, and now he can fly without anyone getting their tighties in a wad. He's been flying under my filed student endorsement as I am an Intro pilot, but this way none of the crannies will give us any grief. I really wanted to see his 450 fly and get him on the sticks!

On the way home I stopped by the Orange Grove Hobby Shop and picked up some 2-1/4" tires from Jason for Aidan's 450. The bigger tires make for better ground handling in the grass than the stock ones, which I think are a bit more than an inch.

My replacement Pulse arrives today! Will surely get started on putting her together, shouldn't take long at all.

Time to break out the helis! Looking to fly again tomorrow!

 

Friday, April 25, 2014

That's a Bummer...

So... According to specs the flight weight of my Sbach 70 tops at 5.5 lbs. With a 6S 4000 mAh 40C battery it weighs in at 7 lbs. I don't know what universe it would weigh in at 5.5 lbs.

And... I ran another time run on that battery and I got 5.5 min at 3/4 throttle down to 3.5V per cell. That's pathetic. I think I got 6-7 minutes with the 2650 mAh 25C ones. I don't think I can fit a 5000 mAh battery in there, let alone the extra weight.

Bummer.

UPDATE: I made up a mockup of the smallest 6S 5000 mAh battery I could find, the Turnigy from HobbyKing, 150x49x52. It won't fit through the frame to be properly positioned to maintain CG. It can enter the fuse from the next frame back, but on moving it forward it runs into the wing tube.

 

Lucky Stupid: Series vs Parallel

I have been making a fundamental mistake in my use of series to increase voltage and capacity: it doesn't do both.

I thought putting them in series increased the voltage AND the capacity was added. It's not...

Series: increase voltage, no increase in capacity. 2 x 3S 2650 mAh gives 6S 2650 mAh.

Parallel: Increases capacity, but does not increase voltage. 2 x 3S 2650 gives 3S 5300 mAh

 

 

 

http://www.zbattery.com/Connecting-Batteries-in-Series-or-Parallel

I have been putting batteries in series knowing I was increasing the voltage andthinking I was ALSO increasing capacity. When I flew the Sbach the other day with two 3S 3300 mAh batteries in series I got 6S but only 3300 mAh! That bought me 6 min total battery to exhaustion time (3.7V per cell). Dammit... I was trying to get more 6S mAh for longer flight times. Guess I will need to by a couple higher mAh 6S batteries.

I have have been mistaken for years... lucky stupid.

Thanks to Kenny Chandler for doubting me!

 

Wednesday, April 23, 2014

Aidan Builds His Eflite Alpha Sport 450

Aidan has gone out with me a couple of times to the RC airfield, and today he finally committed to wanting to do this regularly! We bought him his own Eflite Alpha Sport 450, the perfect trainer, the one I started with several years ago.

He did a wonderful job with it! We set it up and programmed it into my Spektrum DX8, setting his DX7s up as a slave trainer. Tomorrow we hope to get to fly it!