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» 2019 Llanfair TH Village Fete
Trex 700 gas conversion Empty2019-07-12, 18:53 by Rich

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Trex 700 gas conversion Empty2019-03-03, 23:44 by Charles E Cornes

Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

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Trex 700 gas conversion

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Trex 700 gas conversion Empty Trex 700 gas conversion

Post by Zaidy on 2009-12-29, 20:42

Helibug

Thought it might be of interest !

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Andy Sayle on 2009-12-30, 12:31

Oh Yes!

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Guest on 2009-12-30, 15:17

With the cost of the conversion plus the cost of the engine, say from here http://www.rossmod.co.uk/store.php?search=1&value=188&page=2 Looks like the total would run to more than £450 pale . Thats a lot of glow fuel!!!

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Post by Sam Thomas on 2009-12-30, 16:10

Yes indeedy!!!
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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Zaidy on 2009-12-30, 18:20

based on this years fuel cost, it will take two years to get even !
I used over 3 boxes of 20% nitro (4 gallons each box at 5 ltrs, cost per a gallon is £18 ish)
The advantages is that they are a lot easier to look after, and more importantly you get more flight time per a tank ! so I have been told !!!

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Rich on 2009-12-30, 18:24

I want to see your calculations up to the break even point as I can't ever see a helicopter lasting long enough to break even
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Post by Guest on 2009-12-30, 20:21

Same here. Don't forget it's the diference in cost per minute flown between glow fuel cost/m and petrol fuel cost/m. I'll no doubt get corrected. But, I believe you would use approx half the amount of petrol versus glow fuel per unit time flown at a 1/3rd the cost per unit of fuel used (petroloil @ £6.00/g; glow @£18.00/g). So, for every gallon of petroloil fuel used would save you £12.00 approx.
Therefore, £450 divided by £12 equals 37.5 gallons approx. You would have to use, very roughly, 37.5 gallons of petroloil to break even. Thus, multiply twice (because you will get twice as long for the same amount useing petroloil) the flying time obtained from using a gallon of glow fuel by 37.5 and you'll get a very very rough idea of how much flying time it would take. Submitted for correction, criticism and brickbats from the members affraid affraid

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Rich on 2009-12-30, 20:35

Zaidy is still working it all out then trying to get the scanner working to post his findings on here Very Happy Shocked
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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Andy Sayle on 2009-12-30, 20:44

Surely you would buy the kit without the nasty glow engine in though, thus meaning the cost of the conversion is just the helibug bits? The Petrol engines are about the same cost as the Glow ones right? Roughly? If that is the case, you can knock off £225 odd out of your cost breakdown straightaway....

Unless, of course, you already have bought the Glow engine....

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Post by Sam Thomas on 2009-12-30, 20:50

But arent petrol engines bigger and heavier than the glow engines and you have to have a separate ignition system to!
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Post by Brian Colclough on 2009-12-30, 21:10

I think another issue here is that you're converting pre-existing glow model, in this case the Align 700 which is built around the 91 glows and converting it with the necessary bits to a 23/26cc petrol. It would I think be far cheaper to build/buy a ground up petrol powered heli Trex 700 gas conversion Icon_idea

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Post by Guest on 2009-12-30, 21:40

Dave and Zaidy already have the glow motors I believe. They could accept the fuel costs until the motor requires replacement or sell it now as new or nearly new to defer the conversion costs. Lets say the 91 glow, doing lots of hovering and aero's, uses 1.6 fl.oz/min. 160 fl.oz.in a gallon, therefore 100min flying on glow or 200min (1/2 the consumption of glow) on petroloil per gallon. From previous post 37.5 gallons of petroloil required for break-even point. Thus, 37.5 * 200 =7500min or 125Hr. total flying time. This would obviousely be less if the 91 glow was sold. How much less depends on price obtained for the 91 glow.

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Rich on 2009-12-30, 22:07

Therefore bringing into the equation the additional weight of the petrol conversion over the standard glow powered machine fuel consumption would be higher than originally calculated, thus making the conversion non cost effective, if however the petrol conversion did take place...........................

What if you couldn't sell the 91 glow engine & associated components after converting to petrol, this expense must also be incorporated into the overall cost effectivenss of the conversion, could you sell the 91 as new or used thus further reducing the overall benefits of the conversion in the first place.
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Post by Guest on 2009-12-30, 22:14

Hey, hold on, my marker pens have dried up and the wipe board needs a bloody good clean! Can Andy take over now cheers with a few equations perhaps to clarify the process drunken

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Post by Rich on 2009-12-30, 22:16

I've had enough now as well Very Happy
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Post by Guest on 2009-12-30, 22:18

What laughs and jolly japes we have on this forum, eh geek lol!

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Zaidy on 2009-12-30, 22:28

Good effort lads, LOL

Its unlikely I will get a good price for my almost new glow engine, we all know that if its used, it will sell at half price !

Allan, I am still reading through your post regarding the calculations, Rich is correct, I am still trying to work in out
Mad

I will carry on flying my 700 hopfully for a great deal longer than Rich predicted although now its been said I have to be careful

Suspect

Happy days and many thanks for the feed back guys


All the best for the new year to all..

Who is out flying on friday, weather is looking good Question

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Post by Mark Barnes on 2009-12-30, 22:36

Now if we were to electrify said helicopter........................
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Post by Sam Thomas on 2009-12-30, 22:37

No mark, no! Rolling Eyes Rolling Eyes Rolling Eyes
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Post by Zaidy on 2009-12-30, 22:37

Mark Barnes wrote:Now if we were to electrify said helicopter........................

Battery cost, unless you get them from you know who ! But, everything is in short supply Laughing

I have enough trouble getting my 450 sorted never mind a glow to battery conversion NOOOOOOOOOOOOOOOOOOO pale

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Post by Sam Thomas on 2009-12-30, 22:39

I doubt that I will fly on friday, to much celbrating and all, ya know!
Mind you I do want to have a 'Flying start' to the new year! Very Happy
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Post by Sam Thomas on 2009-12-30, 22:40

I guess that my vapor will have to do!
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Post by Guest on 2009-12-30, 22:44

All we need is a bloody big electric motor and a looong set of pantograph pick-ups supported by helium ballons, only fly directly under power lines and we're away Very Happy (possibly with the fairies Rolling Eyes )

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Post by Brian Colclough on 2009-12-31, 08:38

Convert it to petrol first then do the calcs then convert to leccy "if you must" Trex 700 gas conversion Suspect

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Trex 700 gas conversion Empty Re: Trex 700 gas conversion

Post by Zaidy on 2009-12-31, 09:44

Brian Colclough wrote:Convert it to petrol first then do the calcs then convert to leccy "if you must" Trex 700 gas conversion Suspect

now why didn't i think of that..... Cheers Brian Suspect

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