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HelicopterMain Discussion › Aerial Photography !! on Nitro !!!!
10-19-2009 08:46 PM  8 years agoPost 21
TJinGuy

rrProfessor

Socorro, NM - USA

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I have a Knight 600e running 8s 5000 packs. I fly 6min of 2250rpm head speed and use just about 70% of the packs. If I drop the head speed down to 1900 it uses just over half that. So if I were to move to 12s 5000 packs, I could EASILY fly 20min. Yes the bird would be heavy but it would fly that long and be a great camera ship.

Second example. My friend has a Logo 500 running 550 blades. Running 6s 5000 packs he gets about 12min of flight time out of 1900rpm. If he were to move to a 10s 5000 pack (what they run in Logo600s) he could easily run 20min.

The reason people have crappy flight times with electrics is the insane head speeds they run. They like the performance and so do I but you don't have to run high head speeds for photo use. Slow it down and build it smartly and it will be easy to get long flight times.

Now would that be better than a gasser? Yes and no but that is the OP's choice.

- Chris

Team New Mexico
TJinTech

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10-19-2009 09:05 PM  8 years agoPost 22
balsapro

rrVeteran

Gallatin,TN

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I've seen many large electrics and lots of expensive puffed packs trying to get 15 plus minutes. I'm not saying you cant do it but you have to account for every mah.

Its hard to have a professional camera set up weighing in at less than a 5 lbs and that's conservative(for example HCS mounts weigh in at roughly 3 lbs with out the camera and down links). Many professional HD cameras weigh in the 3.5 lbs arena. this makes it hard to justify the expense of large electrics. I can put a 5 lbs camera system on a gasser and with a aux fuel(32-64 oz) tank and an idot could get 30-60 minutes at altitude...

I would like to see anyone get 20 minuted out of any electric heli with and extra 5 pounds on it.

Build the Best, Fly the Best, Crash the Best

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10-19-2009 09:10 PM  8 years agoPost 23
Nashville

rrElite Veteran

Formerly Music City now back home in Sunny Florida

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If I drop the head speed down
if I were to move to 12s 5000 packs
If he were to move to a 10s 5000 pack
That's a lot of "if's". As we all know there is a lot of difference between "if's" and real world flying. I'm not trying to be argumentative here but I do think we should give the OP real world facts. As you said, it doesn't really matter either way, it's up to him.

I was Spektrum when Spektrum wasn't cool

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10-19-2009 09:24 PM  8 years agoPost 24
TJinGuy

rrProfessor

Socorro, NM - USA

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You're correct there are a lot of ifs and that is simply because there are a lot of options and IF you want a heli to fly for 20min on batteries, then it better damn well have been well thought out. But it can be done.

As for carrying 5lbs, there is no 600 or lesser sized bird that would handle that task easily. So yes if he wants to carry that kind of weight, something in the 700mm+ blade size is a must. It would be hard to argue with a gasser for that. But if he wants to carry say 2lbs, then it is a whole other ball game.

- Chris

Team New Mexico
TJinTech

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10-19-2009 10:59 PM  8 years agoPost 25
digikas

rrVeteran

London, Ontario, Canada

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I really have to thank every body here for these beautiful inputs !

I think Gasser is calline me ! , it was obvious that gasser is the way to go from the previous discussions , and that simply due to the following

1. I dont like the idea if having multiple lipos, and that simply cuz I think cost wise its way more higher than the gasser, since taking photos needs alot of patience and this means alot if photos re-take , and so , depending on a battery to do that is kind of risky.

2.
I can put a 5 lbs camera system on a gasser and with a aux fuel(32-64 oz) tank and an idot could get 30-60 minutes at altitude...
if that really can happen then that reason alone would indeed turn my head toward the gasser !!

Its funny, whenever I try to get closer of getting an electric heli, I always find tons of reason that makes me stay away from electric ship !!!
, it seems still new technology after all !!!

Scale life or no life !

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10-20-2009 03:06 AM  8 years agoPost 26
nocontrol1

rrApprentice

Melbourne, FL, USA

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Just a thought... If your looking to shoot stills, I doubt you'll need 20 minutes flight time. If using a downlink, after 6-7 minutes you end up taking too many shots and have to spent a lot of time weeding them down.

$.02

Rob D.

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10-20-2009 04:21 AM  8 years agoPost 27
pseudonym

rrApprentice

Edmonton, Alberta

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LOL, if you think that the ping-pong between gasser and electric is bad, try it between a Gasser Twin and a Turbine!

First off, don't let anyone tell you that you can't do AP with a Nitro. There are a few companies I have seen with Nitro AP birds. There are issues, but quite a few advantages. The big ones being that you have WAY more payload with a Nitro as they have considerably more power than gassers, and that they are extremely good for vibration. The main issues are shorter flight times, cost of fuel and smoke. You can use extra tanks to increase flight times and with a little tubing, can insure that the smoke isn't a huge issue.

Gassers are what seems to be the default if you need a longer flight time and an electric won't do the trick, but they aren't without issues either. The engine runs at a lower RPM with a heavier piston. As the piston moves up and down it causes vibration, which is an issue for most gassers. Century has probibly one of the better vibration reduction systems. The best way to fix the issue is to use a twin cylinder engine, but good luck finding a frame that fits besides the Observer Twin and Industrial Twin!

There may be one more option.. I am hesitant to bring it up as I have very very little info at this point. It appears that O.S. is making a .55 GAS engine! It is called the O.S. GT55. From what I am reading, it seems to be built to be the same size as their .55 engines. Here is the link, this might solve ALL your problems without having to splurge on a new heli (Trust me, you still have camera mounts, electronic stablization and payload control to spring for.. it adds up!). Here is the link:

http://www.rcuniverse.com/magazine/...product_id=4185

Anyone know anything about this engine????

unspelling the world one misprint at a time.

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10-20-2009 05:22 PM  8 years agoPost 28
HELIBROKE

rrNovice

Dallas Texas

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I did not see the mention of DEISEL.If you can get rid if the exhaust, with an extension, you can double the present flight time. You will also gain power.

I built a large camara ship years ago. See my gallery. One of the requirement was an extended time in position. It was possible to stay on station for two hours. But, this was a very large helli.

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10-20-2009 08:39 PM  8 years agoPost 29
digikas

rrVeteran

London, Ontario, Canada

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okay ! what if I added two header tank to each side of the main tank wouldn't that increase the flight time any way , despite the fact that nitro might contaminate the camera lens !

p.s. pantera 50 main tank is 500 cc !

Scale life or no life !

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10-20-2009 08:41 PM  8 years agoPost 30
digikas

rrVeteran

London, Ontario, Canada

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Here is the link, this might solve ALL your problems without having to splurge on a new heli (Trust me, you still have camera mounts, electronic stablization and payload control to spring for.. it adds up!). Here is the link:

http://www.rcuniverse.com/magazine/...product_id=4185
that sounds great actually , however it seems its an engine for plane not heli

Scale life or no life !

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10-20-2009 10:16 PM  8 years agoPost 31
pseudonym

rrApprentice

Edmonton, Alberta

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You could definatly use extra tanks to increase flying time, but this is not a one-to-one relationship. As you increase fuel, you increase weight and therefore increase consumption. Also, you have to make sure that those tanks will A) be directly in the centre of gravity so that as they empty they won't throw the balance off and b) that they drain evenly between the two tanks. I would use a Y connector to the exaust to provide preasure to both tanks and then another Y to the main tank which would now be your "Header" tank. Hopefully that way they will drain evenly.

As for the gas engine.. I know it is for planes.. BUT! It sure gives me some ideas! What are the differences between a heli engine and a plank engine anyhow?

unspelling the world one misprint at a time.

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10-21-2009 12:48 AM  8 years agoPost 32
digikas

rrVeteran

London, Ontario, Canada

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I think the difference between heli and plane engines: the site where the bolts mounts are , and the size of the heat sink !

Scale life or no life !

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10-21-2009 01:58 AM  8 years agoPost 33
pseudonym

rrApprentice

Edmonton, Alberta

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That should be problems which can be overcome quite easily... New motor mounts (you can even just design them and there are companies on the net that will make the part for you) and perhaps some kind of accomidation for cooling perhaps? I think it is completly do-able. I am actually thinking quite hard about trying the conversion myself!

unspelling the world one misprint at a time.

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HelicopterMain Discussion › Aerial Photography !! on Nitro !!!!
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