1/4 & 1/5 scale servos

[Joe Warren]

For those that are running 1/4 scale and 1/5th monster servos in a twin Nitro or twin Gas. The Amp drain can be 1.0 to 1.5 amp stall torque on turn servo. Julian had recently ran 14 tanks thru a twin breaking in engines in Atlanta Spring race pre practice day. That was 10-12 laps per tank. Late in the run the boat lost radio and Ran over another boat that was floating on the course. it was about to collect the Clock too. After carefully checking the DEAD (NEW) Battery. That was approx 168 total laps with 2 turns in each lap with a total of 336 times the servo was against the max amp drain of 1.5 amp. MAKE sure you keep track of the Time and Drain on a Good battery. Or Check IT.... If in question with a cycle checker & Make sure you are 2100 mah or above if you plan a ton of running laps for the weekend and Run 1/4 or 1/5th scale batteries. large SUB Cs or Life High capacity Batteries are a MUST!!!!!!!!

 

[julianconde]

For those that are running 1/4 scale and 1/5th monster servos in a twin Nitro or twin Gas. The Amp drain can be 1.0 to 1.5 amp stall torque on turn servo. Julian had recently ran 14 tanks thru a twin breaking in engines in Atlanta Spring race pre practice day. That was 10-12 laps per tank. Late in the run the boat lost radio and Ran over another boat that was floating on the course. it was about to collect the Clock too. After carefully checking the DEAD (NEW) Battery. That was approx 168 total laps with 2 turns in each lap with a total of 336 times the servo was against the max amp drain of 1.5 amp. MAKE sure you keep track of the Time and Drain on a Good battery. Or Check IT.... If in question with a cycle checker & Make sure you are 2100 mah or above if you plan a ton of running laps for the weekend and Run 1/4 or 1/5th scale batteries. large SUB Cs or Life High capacity Batteries are a MUST!!!!!!!!

Joe thats all correct the battery was new. Actually that battery was in my Jet plane the weekend before the race it was fully charged at Atlanta did open water just fine 168 laps and 5 1/2 gallons in less than 3 hours of run time. I thought the battery would be fine think again friday ran the boat 3 times 10-12 laps each time out BAM no steering nothing. unfortunately i did hit Stu Barr 40 boat which it missed 4 times before it got hit. it really make me mad i did offer to give cash for the parts i hit or to buy the boat itself . . Joe and I troubleshooted to see what was the problem sure enough the battery was gone DEAD no voltage whatsoever.

Lessoned Learned i will only use a 3,000 MAH and above or the highest capacity Life battery i can find..

Julian

 

[Thomas Hulbert]

Your testing put the battery threw about 12race runs of 12+ laps each . I would have checked the battery at least when you were near the 8th test run as you had past a full race weekend on the set of batterys by then. Did you have a voltage meter of any kind in the boat by chance?

Might be an idea to look into for next time.

 

[julianconde]

Ok batteries where charged prior to going on my Roadrunner Twin Hydro its a 6.6V 2400 MAH pack.. boat when it the water 14 times doing 12 laps every time out.. Lesson learned that steering servo loves a lot of juice.. Lesson learned ;-)

 

[P THOMAS]

HA 168 laps is the problem, on a normal test day or weekend it would not have been a problem. im not sure a life battery voltage will drop much till the end. lipo should not be run downpast 3 volt on a 3.7 volt cell. I ruined a life pack by letting it go flat dead so I would not trust that pack untill i saw it run thru a few cycles ok,, probally good idea is just replace it if it ran flat dead. Only good way to do it is run it thru a charger and check the ma it used at the time and log the run time.

 

[julianconde]

HA 168 laps is the problem, on a normal test day or weekend it would not have been a problem. im not sure a life battery voltage will drop much till the end. lipo should not be run downpast 3 volt on a 3.7 volt cell. I ruined a life pack by letting it go flat dead so I would not trust that pack untill i saw it run thru a few cycles ok,, probally good idea is just replace it if it ran flat dead. Only good way to do it is run it thru a charger and check the ma it used at the time and log the run time.

Phil i ran 168 laps in one day ;-) i did not know that steering servo i use took that much power out the battery. Lesson Learned i will change batteries after 5 runs and put a different one and recharge them as i go. i just wanted to break the engines in.

 

[rick lindow]

Julian/Joe, for the atlanta races I ran a 1600mAh NiMH Dura Trax on throttle/third and a insane 2500mAh NiMH on the steering and a new Venom 6V 3000mAh NiMH Large Receiver Battery in the 101 single RR. and we did recharge sat.night (2011 atlanta lost radio 40 hydro) across the pond in the bank no damage, ran open water Thur and Friday ,FIRST HEAT SAT MORN.LOST RADIO WON'T DO THAT AGAIN!!! Really a great topic and info. Also we now date all packs, too many to remember the age on! Rick L.

 

[Joe Warren]

Julian/Joe, for the atlanta races I ran a 1600mAh NiMH Dura Trax on throtle/third and a insane 2500mAh NiMH on the steering and a new Venom 6V 3000mAh NiMH Large Receiver Battery in the 101 single RR. and we did recharge sat.night (2011 atlanta lost radio 40 hydro) across the pond in the bank no damage, ran open water Thur and Friday ,FIRST HEAT SAT MORN.LOST RADIO WANT DO THAT AGAIN!!! Really a great topic and info. Also we now date all packs, to many to remember the age on! Rick L.

Yes I learned several years ago to cycle every other race and the battery needed to come to 100% of its Mah rate or I cut the end off and trashed it. we use white tape to record the MAh and place it on the battery itself with a date . Most Miss the fact that a Digital 1/4 scale servo Knocks the living Crap out of any Good battery. Bullard made a jumper so we could check one a couple of years ago. Was surprised to see 1.5 amp draw at Stall torque..... when you are running TWINS?? If you want the Power to Turn that you bought and place in your boat. You need to maintain Loaded Voltage while the Stall torque drain is on the battery. Many have gone to 4000 MAH plus

 

[SayMikey]

HA 168 laps is the problem, on a normal test day or weekend it would not have been a problem. im not sure a life battery voltage will drop much till the end. lipo should not be run downpast 3 volt on a 3.7 volt cell. I ruined a life pack by letting it go flat dead so I would not trust that pack untill i saw it run thru a few cycles ok,, probally good idea is just replace it if it ran flat dead. Only good way to do it is run it thru a charger and check the ma it used at the time and log the run time.

Phil i ran 168 laps in one day ;-) i did not know that steering servo i use took that much power out the battery. Lesson Learned i will change batteries after 5 runs and put a different one and recharge them as i go. i just wanted to break the engines in.

168 laps in one day,id say you were a lake hog lol

 

[julianconde]

HA 168 laps is the problem, on a normal test day or weekend it would not have been a problem. im not sure a life battery voltage will drop much till the end. lipo should not be run downpast 3 volt on a 3.7 volt cell. I ruined a life pack by letting it go flat dead so I would not trust that pack untill i saw it run thru a few cycles ok,, probally good idea is just replace it if it ran flat dead. Only good way to do it is run it thru a charger and check the ma it used at the time and log the run time.

Phil i ran 168 laps in one day ;-) i did not know that steering servo i use took that much power out the battery. Lesson Learned i will change batteries after 5 runs and put a different one and recharge them as i go. i just wanted to break the engines in.

168 laps in one day,id say you were a lake hog lol

yes sir im doing the same at Evansville I have to break in my 91RS Roadrunner Twin this time i wont run the the boat that many times without changing the battery pack..

 

[ALLAN YUEN]

Read "Issue" scale digital servo ( more surge amp ) than angolog servo ( less surge amp) I always put Hobbico LiFe 2100 or Hyperion LiFe 3000 for my Twin riggers because depend on how to matter weather hot/cold rain . Reason LiFe batterys will drop decrease volt/ amp that's why!

 

[Joe Warren]

Reguardless of your boat application, It is a Must to check the recharge mah time on the battery used in the boat at the end of a Normal Race Day.... This gives you a idea of How Close your Boat application is to using the battery to the max. By checking the Recharge time Gives you a idea on your TIME vs Drain...... Or you may need to up size the battery if you have removed more than 50 percent of the Mah On a Normal race day. Julians Day was NOT NORMAL. He was breaking in new engines & was trying to do 14-15 runs with 50oz tanks in a day. & the Digital 1/4 or 1/5th scale servos are a Voltage HOG!!!!!!!! Especially when you are making fast laps late in the run & are holding a lot of right turn in the Turn servo.

 

[Joe Warren]

Julian thats a real shame

That is 100% and Advertisment for using 2 receivers and 2 Switches ect.

Had either system went down you would still of had either throttle or steering

Hope the damage wast too bad to either boat

Greg sometimes this is true..... But some engineers would argue that if you remove 50 percent of the parts from the radio box..... you have 50 percent less chance for failures?? I have seen many twins that have 2 receivers 2 switches and 2 of everything & also have 2 Homemade Junk batteries that are too small in capacity operating it all. I say... If your boat is worth $20... Give it a CHEAP Homemade battery......... Many are not aware that the Digital 1/4 servos are smacking the sxit out of a Good Battery at the stall torque over an Amp.

 

[julianconde]

Julian thats a real shame

That is 100% and Advertisment for using 2 receivers and 2 Switches ect.

Had either system went down you would still of had either throttle or steering

Hope the damage wast too bad to either boat

Greg i have seen more people have more problems with 2 receivers, 2 Batteries and 2 switches thats just more **** that can go wrong and then you are chasing to see whats the issue id been there done that never doing that again. Now yes if i would have checked the battery after i finished my Twin Marathon at the end of the day that would not ever happened. There was not a scratch on my Twin the other boat had very little damage. Now that i know that the steering servo is a juice hog i will use a 4k MAH life battery pack on all my Twins ;-) and will check the batteries after 5 runs. You learn thru mistakes..

Julian

 

[SayMikey]

Yeah fair enough

I just see the guys here who run twins run 2 receivers with No Issues

If you have a clear radio box lid Hobbyking sell a Battery monitor thats works with Life

that way at a glance you will know were your at

I have these in 3 or 4 of my boats now however in my riggers they dont work because

you can see through the radio box Lid

http://www.hobbyking...Fe_Battery.html

Greg twin guys use thick radio box lids because they hold the pipes on. Lexan wont get the job done

 

[Joe Warren]

Yeah fair enough

I just see the guys here who run twins run 2 receivers with No Issues

If you have a clear radio box lid Hobbyking sell a Battery monitor thats works with Life

that way at a glance you will know were your at

I have these in 3 or 4 of my boats now however in my riggers they dont work because

you can see through the radio box Lid

http://www.hobbyking...Fe_Battery.html

Greg twin guys use thick radio box lids because they hold the pipes on. Lexan wont get the job done

yes great idea. I have seen them used on GAS Twins. they really abuse the batteries A eye glass sight with small piece of lexan on the inside does allow a battery indicator to be used.

 

[julianconde]

Yeah fair enough

I just see the guys here who run twins run 2 receivers with No Issues

If you have a clear radio box lid Hobbyking sell a Battery monitor thats works with Life

that way at a glance you will know were your at

I have these in 3 or 4 of my boats now however in my riggers they dont work because

you can see through the radio box Lid

http://www.hobbyking...Fe_Battery.html

Not a Bad Idea i will have to look into this.. That definitely helps

 

[Piston1]

Julian thats a real shame

That is 100% and Advertisment for using 2 receivers and 2 Switches ect.

Had either system went down you would still of had either throttle or steering

Hope the damage wast too bad to either boat

Greg i have seen more people have more problems with 2 receivers, 2 Batteries and 2 switches thats just more **** that can go wrong and then you are chasing to see whats the issue id been there done that never doing that again. Now yes if i would have checked the battery after i finished my Twin Marathon at the end of the day that would not ever happened. There was not a scratch on my Twin the other boat had very little damage. Now that i know that the steering servo is a juice hog i will use a 4k MAH life battery pack on all my Twins ;-) and will check the batteries after 5 runs. You learn thru mistakes..

Julian

Julian thats a real shame

That is 100% and Advertisment for using 2 receivers and 2 Switches ect.

Had either system went down you would still of had either throttle or steering

Hope the damage wast too bad to either boat

Greg i have seen more people have more problems with 2 receivers, 2 Batteries and 2 switches thats just more **** that can go wrong and then you are chasing to see whats the issue id been there done that never doing that again. Now yes if i would have checked the battery after i finished my Twin Marathon at the end of the day that would not ever happened. There was not a scratch on my Twin the other boat had very little damage. Now that i know that the steering servo is a juice hog i will use a 4k MAH life battery pack on all my Twins ;-) and will check the batteries after 5 runs. You learn thru mistakes..

Julian

You can live on denial but the fact is that all twin pilots should run twin radio systems. You already had some close calls. Don't take any more chances put a backup system in your boat, you will not regret it.

 

[gooycheese]

168 laps is like three 5 heat race weekends correct? I would be charging before the first 5 heat weekend was over. Granted i dont run a twin but would guess it would be similar. No failsafe.... my throttle shuts down when my battery gets low.

 

[julianconde]

168 laps is like three 5 heat race weekends correct? I would be charging before the first 5 heat weekend was over. Granted i dont run a twin but would guess it would be similar. No failsafe.... my throttle shuts down when my battery gets low.

Yeah thats correct. you can run the twin about 6-8 times on one battery charge i just not have time and daylight was going down and i had to finish breaking in the engines before dark.. so i was in a rush and overlooked the battery area.

Julian