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Laser engine in a Hangar 9 Carbon cub

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Ron Gray31/12/2018 13:12:09
1449 forum posts
363 photos

I think that Paul’s is petrol powered, hence multiple batts plus 1 extra for redundancy on flight batts.

Tomtom3931/12/2018 13:35:46
683 forum posts
1 photos

Started off with an Eflite Power 60 470KV on 6S then changed over to an old Laser 100 in my H9 Carbon Cub. It flew beautifully . Another club member has one of the latest Laser 80's from Jon Harper fitted in his , which seems to produce similar grunt as my 100 .

I used standard digital servos (Savox 0252)

Mark a01/01/2019 13:29:09
321 forum posts
3 photos

I've used Hitec metal geared servo's on Aileron's and Elevator and standard servo's on everything else and a 6v nimh pack runs it all just fine. I'll weigh the model next time i'm in the workshop to see what it actually weigh's.

Engine Doctor01/01/2019 16:08:13
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2300 forum posts
27 photos
Posted by Jon - Laser Engines on 31/12/2018 13:02:06:
Posted by Paul Marsh on 31/12/2018 12:09:58:

It is quite a heavy model, although slows down, it seems to fly ok in our windy weather. MIne has got 3 batteries in, as it's using a Dual redundancy system and metal gear digital servos (HS5645MG)

Edited By Paul Marsh on 31/12/2018 12:22:42

yikes! i would use standard servos and a single 4.8v nimh. Why the added beef? Seems seriously overkill for a cub

I always use a dual battery set up now to protect against a cell going down after loosing a nearly new Flair Leo a few years ago.. I hear doubters say "that dual battery is not needed blah blah blah " perhaps not in a small model with small investment in time and money but to see a nice larger model go in and be helpless is a bit annoying to say the least. I always fit dual batteries with diodes to prevent drain and dual switches. A small price to pay for a bit of peace of mind . Ordinary servos will be fine on a cub type model but it has the capacity to carry dual batteries so why Not fit them.

ps. I should add that I now use either twin LiFe 2 cell packs or twin 5 cell NiMh packs with 2.4 radio 

Edited By Engine Doctor on 01/01/2019 16:37:53

Paul Marsh01/01/2019 16:31:40
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3710 forum posts
1053 photos
Posted by Engine Doctor on 01/01/2019 16:08:13:
Posted by Jon - Laser Engines on 31/12/2018 13:02:06:
Posted by Paul Marsh on 31/12/2018 12:09:58:

It is quite a heavy model, although slows down, it seems to fly ok in our windy weather. MIne has got 3 batteries in, as it's using a Dual redundancy system and metal gear digital servos (HS5645MG)

Edited By Paul Marsh on 31/12/2018 12:22:42

yikes! i would use standard servos and a single 4.8v nimh. Why the added beef? Seems seriously overkill for a cub

I always use a dual battery set up now to protect against a cell going down after loosing a nearly new Flair Leo a few years ago.. I hear doubters say "that dual battery is not needed blah blah blah " perhaps not in a small model with small investment in time and money but to see a nice larger model go in and be helpless is a bit annoying to say the least. I always fit dual batteries with diodes to prevent drain and dual switches. A small price to pay for a bit of peace of mind . Ordinary servos will be fine on a cub type model but it has the capacity to carry dual batteries so why Not fit them?

yes

Standard servos: Maybe;

4.8v battery: No, No,No, deffo a big huge No NOoooooo! thumbs down

Dual Battery: Why not, as Engine Doctor said. The model is only worth at it's weakest link. A cheap 4.8v battery is all that is holding the model together with no headroom, especially on a 2.4 Ghz system...

Rich too01/01/2019 18:13:48
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3029 forum posts
1070 photos
Posted by Engine Doctor on 01/01/2019 16:08:13:
Posted by Jon - Laser Engines on 31/12/2018 13:02:06:
Posted by Paul Marsh on 31/12/2018 12:09:58:

It is quite a heavy model, although slows down, it seems to fly ok in our windy weather. MIne has got 3 batteries in, as it's using a Dual redundancy system and metal gear digital servos (HS5645MG)

Edited By Paul Marsh on 31/12/2018 12:22:42

yikes! i would use standard servos and a single 4.8v nimh. Why the added beef? Seems seriously overkill for a cub

I always use a dual battery set up now to protect against a cell going down after loosing a nearly new Flair Leo a few years ago.. I hear doubters say "that dual battery is not needed blah blah blah " perhaps not in a small model with small investment in time and money but to see a nice larger model go in and be helpless is a bit annoying to say the least. I always fit dual batteries with diodes to prevent drain and dual switches. A small price to pay for a bit of peace of mind . Ordinary servos will be fine on a cub type model but it has the capacity to carry dual batteries so why Not fit them.

ps. I should add that I now use either twin LiFe 2 cell packs or twin 5 cell NiMh packs with 2.4 radio

Edited By Engine Doctor on 01/01/2019 16:37:53

+1 yes although I always use LiFe batteries now. and the diodes are not really necessary, imho.

Jon - Laser Engines01/01/2019 18:20:44
4796 forum posts
179 photos

I dont use dual batteries on any of my models. I have never had a battery go on me in over 20 years flying so i do not consider it a problem. That could be because i keep a very close eye on my batteries and their performance, and retire any that dont cut the mustard, but i have not experienced the cell failures others report.

Unless you fly spektrum, 4.8v batteries are fine for a cub no matter how many times you type 'no' in a post. In a model like this, i wouldnt bother with 6v but my 80'' warbirds use 3000+mah 6v nimh subc packs as the flaps draw a fair bit of current when down and AA cells are marginal.

Servos are another debate, but again why use high power servos when they are not needed? 3.5kg is more than enough for a model of this type unless well over powered and i have used them on warbirds up to 75 inch (a galaxy mustang) without a 2nd thought.

Sorry chaps, but i dont subscribe to the ethos of putting piles of extra junk on my models as complexity is the enemy of reliability and preventative maintenance is a far better guard against failure.

Steve J01/01/2019 19:02:57
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1460 forum posts
45 photos
Posted by Jon - Laser Engines on 01/01/2019 18:20:44:

Unless you fly spektrum, 4.8v batteries are fine

The Spektrum brownout myth goes on.

Steve

Engine Doctor02/01/2019 10:45:03
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2300 forum posts
27 photos

Hello John . I subscribe to most of what you say especially with servos however preventative maintenance never helped me ,my model or the bent and bashed YS 140 that was in it , with a nearly new battery from a well known source that failed. I make up my own Nimh batteries now and source good quality cells Or buy decent LiFe Packs

Sub "C" packs do seem far more resilient but a  Sub C is a bit of a  brick and wont always fit in the same space as two smaller  bricks /packs .

I think we will have to agree to differ on this one wink

Edited By Engine Doctor on 02/01/2019 10:55:33

Jon - Laser Engines02/01/2019 11:06:55
4796 forum posts
179 photos
Posted by Steve J on 01/01/2019 19:02:57:
Posted by Jon - Laser Engines on 01/01/2019 18:20:44:

Unless you fly spektrum, 4.8v batteries are fine

The Spektrum brownout myth goes on.

Steve

Not according to all the guys i know that fly spektrum..and the manufacturer...and my own experience. I used to deal with spektrum closely and they recommend regulated 5v or 6v unregulated. this is backed up by everything i have ever seen with their gear and i wouldnt recommend anything else.

ED, most of my models are big enough to loose a subc pack no issue so that aspect is never a problem for me. A failure on a new battery is pretty unlucky to be sure and i tend to give my new packs a good bit of exercise on the cycler before i use them.

As soon as i get the chance my whole fleet will get its pre season battery cycle test. I suspect the battery in my La7 will fail as its 9 years old and has been slowly loosing capacity over the past 2 years. If its lost more than 15% of its original capacity then i will demote it to powering retracts.

Ron Gray02/01/2019 11:08:46
1449 forum posts
363 photos

+1 for preventative maintenance, however my experience (last year) has shown me that it cannot help in situations where a battery (or 2 in my case) suddenly, and I mean suddenly lose all power during a flight and a decent quality switch fails mid flight! It maybe belt and braces but I now fit dual batteries (with Optipower Ultraguard) on all of my more ‘expensive’ ‘planes. I also agree that there is no point in putting in high power servos where not needed, as they tend to draw more power anyway.

Steve J02/01/2019 14:20:54
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1460 forum posts
45 photos
Posted by Jon - Laser Engines on 02/01/2019 11:06:55:
Posted by Steve J on 01/01/2019 19:02:57:
Posted by Jon - Laser Engines on 01/01/2019 18:20:44:

Unless you fly spektrum, 4.8v batteries are fine

The Spektrum brownout myth goes on.

Not according to all the guys i know that fly spektrum..and the manufacturer...and my own experience. I used to deal with spektrum closely and they recommend regulated 5v or 6v unregulated.

What Spektrum actually say is that people should fit power sources that will hold up under the expected loads. Which is good advice for all makes of radio.

Steve, who has been using Spektrum for over ten years and has models with 4 cell NiMHs.

Jon - Laser Engines02/01/2019 15:40:26
4796 forum posts
179 photos
Posted by Steve J on 02/01/2019 14:20:54:

What Spektrum actually say is that people should fit power sources that will hold up under the expected loads. Which is good advice for all makes of radio.

Cant deny its good advice, but it was clearly written by a lawyer! In any event, its not what i was told by the spektrum guys i dealt with for the 6 years i was selling their stuff and my own experiences with it on others models backs up what i was told so i will always recommend 6v.

Im happy to continue to debate it, but perhaps we should kick it offline as we are a mile off topic now.

Ron Gray02/01/2019 16:14:11
1449 forum posts
363 photos

Maybe a thread 'Flight redundancy system - yes or no?'

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