SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Dec 03, 2012, 12:10 AM
Get to the choppa!
RFDelie's Avatar
United States, PA, Pittsburgh
Joined Sep 2012
358 Posts
Discussion
Got 'shot' down today

So I was out flying today, its a nice day here in pittsburgh, a little windy, but nothing I cant handle. Was in the park I always fly in. I was about halfway through my third battery when my transmitter suddenly started giving the low battery beep at me. When I started the day I had a 9.5 power reading, it usually starts beeping when it dips below 9.0. Under normal circumstances this is really not a big deal, I can fly for a while below 9.0, but I must have had a battery go bad or something. As soon as it started beeping I looked down at it and it said 8.3 (woah). Looked up at the bird and started heading back. There was a wind so I had to fight it a little to get home. All of a sudden the transmitter went dead, as soon as it did my helicopter shot up to full throttle and gained a huge amount of altitude, the wind blew it about 90 yards away from me and it hit the grass upside down at an angle at full throttle. When I walked up to it the motor was still racing but the teeth were stripped off of the main gear, but I had to carefully pull the battery because if the gear would have moved to a point where there were teeth the blades would have jerked on me.

As far as damage goes, I got lucky, it was pretty banged up, but could have been worse. It tore the heck out of the turf.

1 tail boom
1 set of blades
1 set of landing skids
1 main shaft
1 tail shaft
1 tail drive belt (my boom was so twisted I had to cut the belt to get it off because I could not release the tension)
1 bottom plate
1 tail stabilizer
1 main gear
1 set of boom braces

Spent 60.00 to replenish my part stock and replace the parts I didnt have (I keep a pretty large stock because I hate waiting for parts). Every time I have to replace something I buy 2 so I have one for next time.

I was able to replace everything except for my bottom plate and boom braces out of my parts stock. But the bottom plate is useable until a replacement arrives and the boom braces were glued and drying overnight.

It looks ok on the bench, will fly it tomorrow and we will see if anything else needs replaced.

What a day!
RFDelie is offline Find More Posts by RFDelie
Last edited by RFDelie; Dec 03, 2012 at 12:30 AM.
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 03, 2012, 12:19 AM
Need More PURPLE !!
Dejavu*Xion's Avatar
United States, NV, Las Vegas
Joined Aug 2012
3,747 Posts
I had a day like last week...only mine was a straight up dumb thumb. Was doing an invert hover and wife starts yammering at me. Loss of concentration cost "us" about $60 in damage to my 500e. That'll teach her to just hush and watch..
Dejavu*Xion is offline Find More Posts by Dejavu*Xion
Reply With Quote
Old Dec 03, 2012, 12:27 AM
Get to the choppa!
RFDelie's Avatar
United States, PA, Pittsburgh
Joined Sep 2012
358 Posts
LOL - Damn wives, I leave mine at home when I fly, she is paranoid about being hit with the helicopter for some reason. She starts screaming if it even heads towards her side of the hemisphere.

My two year old on the other hand just holds onto my pant leg (so i know she is there) and says "daddy fly up" "daddy fly down" along with the usual toddler banter. But she loves the helicopter so much she behaves herself. I cant wait until she can fly a helicopter.

The good news is that the steelers beat the Ravens!
RFDelie is offline Find More Posts by RFDelie
Reply With Quote
Old Dec 03, 2012, 12:47 AM
Need More PURPLE !!
Dejavu*Xion's Avatar
United States, NV, Las Vegas
Joined Aug 2012
3,747 Posts
Ahhhhh good story RF......those were the best years when raising my kids. ( the pant leg years) and funny about your wife wanting to be no where close. Ha...I think at times my wife gets a lil bored of it all, and I have to remind her of the days when I was lucky to just hover off a sidewalk curb for 5 seconds. .....typical Steelers smash mouth game today with the ravens. my bad for putting my bet on the ravens today..batch did a great job. ...yeah I lost money ther as well.. just not a good week for "us" ...lol...
Dejavu*Xion is offline Find More Posts by Dejavu*Xion
Reply With Quote
Old Dec 03, 2012, 12:52 AM
Get to the choppa!
RFDelie's Avatar
United States, PA, Pittsburgh
Joined Sep 2012
358 Posts
Quote:
Originally Posted by Dejavu*Xion View Post
Ahhhhh good story RF......those were the best years when raising my kids. ( the pant leg years) and funny about your wife wanting to be no where close. Ha...I think at times my wife gets a lil bored of it all, and I have to remind her of the days when I was lucky to just hover off a sidewalk curb for 5 seconds. .....typical Steelers smash mouth game today with the ravens. my bad for putting my bet on the ravens today..batch did a great job. ...yeah I lost money ther as well.. just not a good week for "us" ...lol...
Betting against them is usually a smart move, they rarely ever cover the spread when they are favored to win.
RFDelie is offline Find More Posts by RFDelie
Reply With Quote
Old Dec 03, 2012, 05:28 AM
Registered User
Australia, VIC
Joined Dec 2011
1,108 Posts
Yeah

Problem is - Battery can be down on capacity - but the voltage at rest does not reflect this , but once under load [ use ] for a while the voltage can drop rather badly , if you discharge a lot of batteries you can see this ...

It will hold a certain voltage level till its almost dry and then start dropping voltage quickly .

My Batteries have been @ 9.5v for over a month now , so Im expecting voltage to start dropping on me soon
old4570 is offline Find More Posts by old4570
Reply With Quote
Old Dec 04, 2012, 02:52 PM
Don't take any wooden nickels
finguz's Avatar
United States, CA, San Diego
Joined Mar 2012
2,366 Posts
That sucks RF!
finguz is online now Find More Posts by finguz
Reply With Quote
Old Dec 04, 2012, 03:18 PM
Rocket Programmer
jasmine2501's Avatar
United States, AZ, Mesa
Joined Jul 2007
25,460 Posts
Quote:
Originally Posted by old4570 View Post
Problem is - Battery can be down on capacity - but the voltage at rest does not reflect this , but once under load [ use ] for a while the voltage can drop rather badly , if you discharge a lot of batteries you can see this ...

It will hold a certain voltage level till its almost dry and then start dropping voltage quickly .

My Batteries have been @ 9.5v for over a month now , so Im expecting voltage to start dropping on me soon
The radio battery is under a constant load unless you're running it as a trainer box - so this didn't happen because of sudden increase in load. I suspect it happened because of discharge curve and battery quality - when the battery quality goes down either due to bad initial quality or wear, the 'end' of the discharge curve gets steeper - the drop-off happens faster. So, I would suggest topping off the battery when it shows 9.0 - I usually never let mine get that low. I use an A123 pack, so when it gets low, I can charge it in like 10 minutes.
jasmine2501 is offline Find More Posts by jasmine2501
Reply With Quote
Old Dec 04, 2012, 03:19 PM
A&P in training
ASTREA1's Avatar
United States, CA, Vacaville
Joined Dec 2008
1,264 Posts
Sorry to hear that, it's never fun watching your helicopter hit the ground and there is nothing you can do about it. Failures suck!
ASTREA1 is offline Find More Posts by ASTREA1
Reply With Quote
Old Dec 04, 2012, 03:28 PM
Registered User
ptflyer's Avatar
Connecticut
Joined Oct 2008
127 Posts
that sure sucks but the title of this thread is a little misleading.....

being shot down means someone turns on their TX on the same channel as yours and you lose control (back when 72 is what we used and some still do)....no?

what you did was let your TX battery get to low....
ptflyer is online now Find More Posts by ptflyer
Reply With Quote
Old Dec 04, 2012, 03:57 PM
Don't take any wooden nickels
finguz's Avatar
United States, CA, San Diego
Joined Mar 2012
2,366 Posts
Quote:
Originally Posted by ptflyer View Post
that sure sucks but the title of this thread is a little misleading.....

being shot down means someone turns on their TX on the same channel as yours and you lose control (back when 72 is what we used and some still do)....no?

what you did was let your TX battery get to low....
I thought someone literally shot his heli down with a gun. Heli-skeet
finguz is online now Find More Posts by finguz
Reply With Quote
Old Dec 04, 2012, 04:03 PM
Rocket Programmer
jasmine2501's Avatar
United States, AZ, Mesa
Joined Jul 2007
25,460 Posts
Quote:
Originally Posted by finguz View Post
I thought someone literally shot his heli down with a gun. Heli-skeet
One of these days I'm gonna go do this...

Shooting RC Planes with Machine Guns at Big Sandy Range 2010 (9 min 33 sec)
jasmine2501 is offline Find More Posts by jasmine2501
Reply With Quote
Old Dec 04, 2012, 04:04 PM
Closed Account
Joined Apr 2010
1,025 Posts
Quote:
Originally Posted by jasmine2501 View Post
So, I would suggest topping off the battery when it shows 9.0 - I usually never let mine get that low. I use an A123 pack, so when it gets low, I can charge it in like 10 minutes.
If mine gets to 9.5, the next time I turn on the transmitter it changes to mode 1. My alarm is set at 9.8 and when it goes off I'm done flying.
karlik is offline Find More Posts by karlik
Reply With Quote
Old Dec 04, 2012, 04:49 PM
Registered User
Joined Apr 2008
1,579 Posts
The OP failed to perform a "failsafe" thus resulted in full throttle when connection between tx and rx was lost. Always perform the "failsafe" as the final set up step.
chopper62 is offline Find More Posts by chopper62
Reply With Quote
Old Dec 04, 2012, 05:10 PM
Don't take any wooden nickels
finguz's Avatar
United States, CA, San Diego
Joined Mar 2012
2,366 Posts
Quote:
Originally Posted by karlik View Post
If mine gets to 9.5, the next time I turn on the transmitter it changes to mode 1. My alarm is set at 9.8 and when it goes off I'm done flying.
Wow, crazy.

What brand tx's guys?

Jas, it's amazing how many rounds missed in that vid (I didn't watch the whole thing though I admit).

Chopper, I think your right.
finguz is online now Find More Posts by finguz
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Unions got knocked down a notch today ... logan5 Life, The Universe, and Politics 23 Jun 24, 2012 11:48 AM
Discussion i got it i got it i got it today..... smitty919 FPV Talk 4 May 11, 2012 09:36 PM
Alert (April Fools!!) :) My P51-D got shot down today in Bagram, Afghainstan!!! lmopar69 Electric Plane Talk 52 Apr 13, 2008 11:57 PM
I Got Shot Down Today E-Challenged Electric Plane Talk 60 Mar 13, 2004 10:11 AM
Well my flying day went down the tube when someone got shot! Jim Poor Life, The Universe, and Politics 4 Sep 10, 2003 07:37 PM