Dynam Gloster Meteor twin 70mm EDF jet - Page 8 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 03-03-2021, 06:35 PM   #71
4stripes
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Re: Dynam Gloster Meteor twin 70mm EDF jet


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Made three flights today. Two 5 minute and one short due to a fan that changed its tune (sounded like the dynamic balance had changed).
Very pleased with our new Gurney flaps (or wickerbill if you prefer) on the elevators! My elevator response is now normal pulling out of a dive. The elevator no longer needs to be trimmed down for level flight. The tiny addition to the trailing edge gives the down trim needed.
First flight was over 5 minutes and the remaining pack voltage was 22.4 or roughly 3.74v / cell and the charger only put back less than 3400mah! Those old cyclone power outrunners do a decent job, or so I thought... the last flight sounded off so I landed and discovered the left fan producing some vibration. Not enough to rub the shroud but enough that we will investigate the change. Most likely, we will put a pair of FMS fans in since they are sitting on our bench (from our crashed ME262).
Always something going on when flying EDF! Still a great day for the Meteor. Even did a half respectable knife edge.
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Old 03-03-2021, 09:59 PM   #72
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Re: Dynam Gloster Meteor twin 70mm EDF jet

Looks really nice Eric. Love all those bright lights!
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Old 03-04-2021, 06:02 AM   #73
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Re: Dynam Gloster Meteor twin 70mm EDF jet

Thanks Nicholas! They get me thinking that all our models need more lighting!
Also thanks again for those perfect intakes! Really finishes off those nacelles.
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Old 03-04-2021, 02:47 PM   #74
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Re: Dynam Gloster Meteor twin 70mm EDF jet

Swapped out the cyclone power 2000kv outrunners with CS7012 fans for FMS 1850kv inrunners also with almost identical 12 blade rotors spinners and shrouds. The largest difference is the mounting tabs are in different places and the FMS units weigh 48g more each.
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Old 03-25-2021, 07:31 PM   #75
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Re: Dynam Gloster Meteor twin 70mm EDF jet

Finally flew the twin FMS fans today in our Meteor. Very pleased with the power but the peak power is 112amps which means the one 6000mah 6S pack is working hard. No big deal since the plane flies most of the flight under half throttle. They are the same fans as in our WR 737 but they don't sound as nice. Not bad, but just not as sweet. Although they are both Predator 80amp ESC's, they don't seem to run perfectly in sync at all power levels. Even their manual setup beeping sequence seems to run at different timing which makes things complicated (each has to be set separately).
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Old 04-02-2021, 03:00 PM   #76
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Re: Dynam Gloster Meteor twin 70mm EDF jet

Chris is making good progress!
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Old 04-02-2021, 03:33 PM   #77
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Re: Dynam Gloster Meteor twin 70mm EDF jet

I have the same airplane. I separated the two power systems by cutting at the "Y" connection and adding two connections for individual ESC's. I removed some foam in the battery area as well as the crappy battery holder. I replaced this with a plywood floor with velcro. I am now able to carry two 6s 3300 or 4000mah batteries and the plane flies very well but more importantly the batteries are staying happier as a result of only a single edf drawing current.
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Old 04-03-2021, 06:48 AM   #78
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Re: Dynam Gloster Meteor twin 70mm EDF jet

What 6S fans are you using?
Two 6S 4000mah packs must make the plane heavy? Nose heavy for sure?
How is the plane holding up? Ours has quite a few flights now, mostly windy days unfortunately. What CG have you settled on? Ours is at the aft edge of the wing spar/wiring cover piece of foam.

I don’t believe in using two smaller packs unless you just happen to only have that size. I think the stress on the cells comes out the same except now you may end up with unequal voltages to each fan under heavy load (if one pack isn’t as strong as the other). For my larger A10 and F14 I use two packs but in parallel. Just using the size packs I have in most of my other jets rather than buy a dedicated large single pack.
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Last edited by 4stripes; 04-03-2021 at 07:02 AM.
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Old 04-04-2021, 04:17 PM   #79
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Re: Dynam Gloster Meteor twin 70mm EDF jet

You know, most of my jets use a single 6s 5000 mah battery which is fine for a single motor system. When you get into dual systems you are asking a lot from a single battery. Even if the "C" rating is high, the load will be more than what is optimal. By switching to 2 6s 3300 batteries I am carrying 1600mah more energy, the batteries are well within the "C" rating and after a 2 and a half minute flight and a couple of extra circuits if the landing needs to be aborted and I land with warm non-puffed batteries.
I use two 6s Dr. MadThrust 2200 mah 70mm fan units.
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Old 04-04-2021, 04:59 PM   #80
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Re: Dynam Gloster Meteor twin 70mm EDF jet

I'm using 4S battery packs.

I also split the wires to accommodate 2 battery packs. I even tried a single 6600 mah pack, and it was really hot after a 3 minute flight.

After splitting the wires for 2 (4S 5000 mah packs), I'm getting 30-second-longer flights, and the batteries get only slightly warm.

It is a bit nose heavy, and requires half-flaps and a long takeoff run, but flies just fine once up in the air.
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