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Post  Tobaiies Sun May 07, 2023 2:12 pm

Like my first Cox a few years ago, I have now found my first CO2 engine in our basement. CO2 Gasparin GM120 Img_6610
My father probably bought it about 25 years ago, before I even existed. Wink
I figured I'd have to give this one a try too, maybe it'll be just as fun as a Cox. Smile
It was exciting to see that exactly these engines are still being produced!

That's why I looked around for a suitable model and ordered the right CO2 cartridges.

I found the 1979 Puffin on Outerzone. It has a wingspan of 24 inches.
CO2 Gasparin GM120 Img_6612
CO2 Gasparin GM120 Img_6613CO2 Gasparin GM120 Img_6614
At the moment the wing is finished, and in a few days I should be able to run the engine for the first time.
CO2 Gasparin GM120 Img_6615
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Post  getback Mon May 08, 2023 7:52 am

Cool CO2 power , is the puffin going to bee FF or you putting in some electrics ? Either way should bee a good flier from what I have seen , one video LOL This Site Rocks!
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Post  Tobaiies Mon May 08, 2023 1:48 pm

getback wrote:Cool CO2 power , is the puffin going to bee FF or you putting in some electrics ? Either way should bee a good flier from what I have seen , one video LOL This Site Rocks!
Yes, I will install a small UMX receiver unit. Otherwise I am a bit afraid that he will fly away. RC Plane CO2 Gasparin GM120 Img_6616
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Post  getback Tue May 09, 2023 2:33 pm

Tobaiies wrote:
getback wrote:Cool CO2 power , is the puffin going to bee FF or you putting in some electrics ? Either way should bee a good flier from what I have seen , one video LOL This Site Rocks!
Yes, I will install a small UMX receiver unit. Otherwise I am a bit afraid that he will fly away. RC Plane CO2 Gasparin GM120 Img_6616
Yes at least A Better chance anyway lol! Popcorn
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Post  cstatman Tue May 09, 2023 4:13 pm

super super cool

I wanted a Gasparin for the longest time. brilliant motors

keep us posted on your build! cool!
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Post  ffkiwi Tue May 09, 2023 7:14 pm

Nothing at all wrong with Gasparins-they were what the second generation (ie 70's 80s) CO2 motors should have been but weren't-and an order of magnitude better than their predecessors such as the Telco, Shark, Modela and DP-03 in reliability. There was even a set of RC gear specifically made for C02 use back in the 90s.....not surprisingly it emanated from the Czech Republic...just like Gasparins...(I have one..its pulse proportional-so very light for its era.....but doesn't really bear comparison with the current crop of equipment intended for indoor R/C use-and still only gives you rudder control-whereas now if you wish you can have full house R/C for only a few grams....though I admit retracts might be a bit of a challenge at the size and weights we're talking....

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PS Aeromodeller published a CO2 R/C model for this equipment back in Nov 94, named the 'Quark' by well known UK designer, Peter Miller. A separate review of the CETO 27MHz pulse system was also published in the same issue.....pioneering stuff....
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Post  Tobaiies Sun Aug 13, 2023 3:42 am

The plans have changed a bit. I bought two small rubber motor kits from my local hobby shop. I decided to equip one of them with the Gasparin. CO2 Gasparin GM120 Img_7612CO2 Gasparin GM120 Img_7611
After the construction I covered the first time with covering paper. Turned out better than I thought. CO2 Gasparin GM120 Img_7613CO2 Gasparin GM120 Img_7710
I raised the motor with some balsa wood so it fits perfectly under the hood. I didn't install any RC. CO2 Gasparin GM120 Img_7713CO2 Gasparin GM120 Img_7712CO2 Gasparin GM120 Img_7711CO2 Gasparin GM120 Img_7714

After the first throws I filled the tank and dared the first motorized flight, flies wonderfully!
I think the tank has a leak, the flight wasn't particularly long. Refueling doesn't work optimally either, the original adapter doesn't quite fit my cartridges. in addition, the valve is no longer original.
If someone knows where you might find an adapter like this, I'd be happy to hear back.
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Post  getback Sun Aug 13, 2023 5:00 am

hey man plane looks really good , i would try these people >>  http://www.old-engine-model.com/en/877.sada-nahradni-dilu-gm-120/ Very Happy
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Post  akjgardner Sun Aug 13, 2023 3:19 pm

Nice job on your airplane
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Post  rsv1cox Sun Aug 13, 2023 5:59 pm

I love this post, love stick and tissue and a nice clean build. It looks great!

Bob
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Post  Tobaiies Mon Aug 14, 2023 1:35 pm

thanks, guys!
I already knew this website, there I found adapters for sodastream bottles, unfortunately these have been sold out for a long time.
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Post  getback Tue Aug 15, 2023 6:21 am

Well I looked some more with very little help , what part are you looking for and does the package have a number to reach out for parts ? I don't know much about these units but it seems they have been out of production for a while ? There was a forum from 2010 i think i looked at a guy was getting parts but he never said where , was in CZ Try this place its the company that produces I think >> http://gasparin.cz/  You may have to get in touch with them . Good Luck Smile
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Post  ffkiwi Sat Aug 19, 2023 2:34 am

I've been away at the FF WCs so only beginning to catch up on various posts here. I'll make several points-you need to ensure good reinforcing of the area where the filler valve is located....a surprising amount of force is exerted on the airframe when you push the charger in contact with the filler valve. it is standard practice with CO2 models NOT to build this filler valve into the airframe but to have it hanging free so it can be grasped with one hand whilst the charger is applied with the other.

two-your leaks.....most CO2 motors use O-rings for sealing in the tank, valves, and head...with time these can harden, shrink, or distort and generate leaks...and you're applying about 700 psi of pressure when the system is charged....so they need to seal. it SHOULD be possible to buy a spares kit for the Gasparin which will contain spare O-rings, screws, ball valves etc.....either from Czech sources or perhaps on Ebay.

three-the amount of 'fuel' transferred depends on several things-the ambient temperature, the tank temperature-but most of all, whether you hold the charger pointing up or down-if up you will only get a gas charge in the tank, if down you will get a 'liquid' charge-actually a mixture of gaseous and liquid CO2...so the latter will give you a longer run than a gas charge alone.

fourthly-the rate of gas usage will depend on the speed setting of the motor which is controllable-though by trial and error-by adjusting the cylinder up or down to alter the valve-piston timing which allows more or less gas to flow at TDC...which determines speed. So there is no point over revving the engine-it just wastes gas....but the exact setting can only be determined by test flying the model.

good luck-it seems you're off to a good start.

 ChrisM
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Post  Tobaiies Sat Aug 19, 2023 2:58 pm

Thanks for the info! I still have spare seals and so on that came with the engine. These don't look brittle.CO2 Gasparin GM120 Img_7821 I'll replace them and see how the old ones work. I will ask old engine model if they still produce such adapters and if they will be available again. So far I have used this for refueling.CO2 Gasparin GM120 Img_7820
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Post  ffkiwi Sun Aug 20, 2023 12:53 pm

Some plumber's stretchable teflon tape is also a good idea if you get leaks around the threads of the charger unit when screwing it up...which is why the CO2 Sodastream cylinder, paintball CO2 bottle or a small CO2 fire extinguisher are a much better option than CO2 bulbs in the traditional screw together charger unit.

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