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RE: Poulan 25 from FL trimmer - 7/10/2005 12:23 AM   
mikenlapaz



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Which glow plug are you using? Read about using 4 Stroke plug in another thread.
Where is the glow element in relation to the bottom of the metal (Alum) plug you inserted in the old spark plug?

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RE: Poulan 25 from FL trimmer - 7/10/2005 4:39 AM   
RysiuM



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quote:

ORIGINAL: mikenlapaz
Which glow plug are you using? Read about using 4 Stroke plug in another thread.


I must admit, I have no idea. It is not OS A3 (I have whole bunch of them), and looks like the other K&B plugs I have (KB-1L). I get it from the box I keep 'no good' plugs (It didn't not hold glow engines any more - like platinium is gone).

quote:

ORIGINAL: mikenlapaz
Where is the glow element in relation to the bottom of the metal (Alum) plug you inserted in the old spark plug?


I made an aluminum insert pressed inside the demolished spark plug so the bottom of insert is flush with the spark plug bottom (I cut off the elctrode flush with the bottom of the plug). Then the glow plug is flush with this (it does not stick out of the spark plug).

RysiuM

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RE: Poulan 25 from FL trimmer - 7/11/2005 6:10 AM   
RysiuM



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Status: offline 		Finally I have some comparision numbers to brand name RC engine. I run the same wooden prop 18x8 I had on MVVS 1.6 gasser. This prop is way to big anyway. But my MVVS (new not broken yet) turned 6700rpm and after opening the muffler it peeked at 7000rpm. Poulan 25cc couldn't go beyong 5400rpm. It is over 1300rpm less.
I was expecting this as I could easy feel Poulan has much lower compression than MVVS 1.6. But what the heck, if you are not into super high performance and want to save a buck, this conversion is fine.

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RE: Poulan 25 from FL trimmer - 7/11/2005 8:48 AM   
davewallace


 

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I bet that your MVVS won't run well with a glow and gas fuel. Hows that for low weight and cheap fuel?

Dave

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RE: Poulan 25 from FL trimmer - 7/11/2005 9:24 AM   
RysiuM



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quote:

ORIGINAL: davewallace
I bet that your MVVS won't run well with a glow and gas fuel.


I'm sure it doesn't. Do much compression.

quote:

ORIGINAL: davewallace
Hows that for low weight and cheap fuel?


And for cheap engine. MVVS cost me 10 times more than this weedwacker (or 20 times if I don't include muffler).

Every day with every new experiment brings new eperience and gives me more knowledge. But unlike many other guys I don't keep them in secret. I have this luxury to take is as a hobby and because I don't do engines for living I can let the secrets out

I have another Poulan 25 on it's way so I will check is it behaves on the glow plug the same way. I'm going to make it super light gas fuel glow plug engine and put it on some 3D frame. Than I will see if it behaves.

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RE: Poulan 25 from FL trimmer - 7/12/2005 9:23 AM   
aero nut


 

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Status: offline 		Hi Rysium! this is areo nut from the gas fuel glow plug no ignition, where did you buy the engine at $25 bucks' I am currently flying a 25 featherlite plus with 50%gasoline, 50% methanol and 5% nitro and having a ball with it, better rpm's than gasoline , smoother and better transition from idle to high, so I would like to buy a couple more to convert and design a plane specially for that engine, I am currently flying a ModelTech Excite 90 and cand do everything with it, but it seem that they aren't selling that plane any more, or at least Hobby People isn't.
So please I would appreciate if you can give the addres on where to buy the engines if they still have them available. Thanks.
Your buddy from down Baja. Bill Pomplun A.K.A. Aero Nut.

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RE: Poulan 25 from FL trimmer - 7/13/2005 12:05 AM   
aero nut


 

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RE: Poulan 25 from FL trimmer - 7/13/2005 6:30 AM   
farley9n


 

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Status: offline 		Hi again! If you are really interested in this engine you would have to win it through ebay. It ends next Sunday. These are light engines and the shipping would probally be $10 or less most anywhere on the continent. I feel a little funny about jumping in and selling something through these forums. Mostly I just moniter and have learned a great deal over the time I have been a participant. I do sell a lot of engines of various types on ebay and have been doing it for about 3 years. At any rate if you email me I am always ready to answer questions and so forth..........farley9n

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RE: Poulan 25 from FL trimmer - 7/16/2005 7:05 AM   
me 02


 

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Status: offline 		Check Sears for discontinued or reconditioned weedeater 25cc featherlite string trimmers. I bought one today for $55.00 in like new condition. dave

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RE: Poulan 25 from FL trimmer - 7/17/2005 9:57 AM   
RysiuM



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quote:

ORIGINAL: me 02
Check Sears for discontinued or reconditioned weedeater 25cc featherlite string trimmers. I bought one today for $55.00 in like new condition. dave


I looked at the whole line of FL trimmers. There are many version of 25cc and some of them are allowed in California. I believe they are a little more restrictive for the power so it will not polute much. On the other hand, i think they will be weaker for our project. So I will stick with the enignes that are not allowed in CA for better power and performance. Hopefully our planes don't need to pass smog test yet to fly in California .

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RE: Poulan 25 from FL trimmer - 7/17/2005 6:09 PM   
Prop Nut



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Status: offline 		The Poulan factory store in Texas sells the FL 25cc Leafblowers for 37.50 (we purchased around 10 of these last year) and they also make great conversons. The carb adapter is twisted so it makes it very easy to hook up to the servo. It is an incredibly easy conversion I have been flying mine on a BalsaUSA Eindecker for over a year (well the eindecker plinked in a couple of weeks ago due to me trying to fly on a dead battery, but the engine is one tough little bugger). I am getting almost exactly the same stats that you are. 7200rpm on a 16x8. Its not a powerhouse by any means but for 46.50 (cost with shipping) I have a reliable engine for floater aircraft. By the way, DONT CUT OFF THE EXTRA MAGNETO BRACE. Sorry for yelling If you have a hard nose landing (what? ME? Never!) you can easily crack the mag housing right off the engine. (Can you tell I have experienced this?) Some creative use of #6/32 screws and a tap fixed it up a bit.

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RE: Poulan 25 from FL trimmer - 7/18/2005 6:25 PM   
RysiuM



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quote:

ORIGINAL: Prop Nut
I am getting almost exactly the same stats that you are. 7200rpm on a 16x8. Its not a powerhouse by any means but for 46.50 (cost with shipping) I have a reliable engine for floater aircraft. By the way, DONT CUT OFF THE EXTRA MAGNETO BRACE. Sorry for yelling If you have a hard nose landing (what? ME? Never!) you can easily crack the mag housing right off the engine.


I have two new engines comming in and I want to see how light I can go. This time I will cut every piece of the case I would think is not needed (including magneto bracket and fuel tank mount). I want to see how light this engine can be running on the glow plug. One sub C size NiMh cell (3700 mAh) that weights 2.3 oz can power the glow plug for almost 2 hours. If it works fine this could combine all benefits of gas engine (fuel economy, clean burn, reliability, no restrictions for fuel tank positioning) with benefits of glow engines (light, simple, cheap, no RF interference). I'm not going to achieve the glow engine's power but rather having a gas engine witout going into all related expenses and complexity. And 7400 on 16x8 is good enough for me as long as it cost less than 50 dollars to buy and less than a dollar for 1 hour of flying

Now I need to find a cheap plane that I can put this engine in.

RysiuM

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RE: Poulan 25 from FL trimmer - 7/19/2005 4:17 AM   
flipflop


 

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Status: offline 		I did this one just last week. Ultra Stik 60. moved the firewall back an inch and a half, put the servos in the tail, made a hatch in the rear of the fuse for the battery, used a Sullivan tailwheel. I don't know how accurate my digital fish scales are, but they say it weighs 7lbs, 10 ounces. I've got 5 flights on it so far, great flier and it still lands like a Stik. This particular motor turns an APC 16x8 at 8450rpm and gives the plane insane vertical. Looking for someone with a DA 50 to challenge to a vertical drag race out of a hover.

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RE: Poulan 25 from FL trimmer - 7/19/2005 7:39 AM   
shussey


 

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Status: offline 		Farley9N -

I see nobody bought your engine on Ebay....wanna sell it to me. I know you said you weren't thrilled to sell stuff on this forum, but if you would entertain it, let me know what you want for it. You can email me at sahussey12@yahoo.com.

Thanks,

Scott



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RE: Poulan 25 from FL trimmer - 7/19/2005 11:54 PM   
aero nut


 

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Status: offline 		Hey Rysium try a 50/50 gasoline /methanol combination on your glow conversion and you will see a tremendous difference in power also you won't need the battery just try, I thi8nk that you should be able to get some methanol in your locality.

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RE: Poulan 25 from FL trimmer - 7/20/2005 1:24 AM   
RysiuM



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quote:

ORIGINAL: aero nut
Hey Rysium try a 50/50 gasoline /methanol combination on your glow conversion and you will see a tremendous difference in power also you won't need the battery just try, I thi8nk that you should be able to get some methanol in your locality.


I read about all the problems mixing menhanol with gasoline and oil (I used Motul).

BTW what kind of places sell methanol? I never needed one so I have no cle where to look for it. I didn't see it Laws, Orchard nor Home Depot, so it is not a probably paint solvent. I saw 91% isopropyl in Walmart (90c for 16floz) but I don't think it will work the same.

One more thing is how my carb will survive methanol? I don't want to destroy it.

RysiuM

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RE: Poulan 25 from FL trimmer - 7/20/2005 5:43 AM   
Antique



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Status: offline 		Methanol won't destroy the carb...We rebuild the carbs on our methanol powered race engines and fly all season...I have carbs here from about 6 years ago, just put in a box and left alone...Only thing needed is new diaphragms, the old ones get stiff..
FWIW, Walbro does NOT make any special carbs or diaphragms for methanol..The WT499 used on the glow G23 uses the exact diaphragms as all the others....You can see the official word from Walbro's engineer Luis Salas on the carb section at my website, rcignitions.com

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RE: Poulan 25 from FL trimmer - 7/20/2005 9:42 AM   
RysiuM



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Methanol won't destroy the carb......Only thing needed is new diaphragms, the old ones get stiff


I read this note and it is exactly what I'm saying. I didn't mean that methanol wil rust aluminum or brass parts The rubber-kind parts in the fuel pump part will stop working over the season or two.
I have a weed whacker and a blower that I'm using for last 7 years and I don't even know where is the carburator in these things I expect the same reliability form model airplane engine. I don't rebuild my glow engines every season and I'm not going to do with gas either.
Saying that I don't mind running glow plug from the battery during the flight. NiMh cell will last much longer than diaphragms soaked in methanol. Sub-C NiMh (3700mAh) weights a little over 2 oz, will last for at least 90 minutes on one charge, and can be charged at least 500 times. It's much easier and cheaper to replace NiMh than rebuild the carb

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RE: Poulan 25 from FL trimmer - 7/22/2005 8:36 AM   
aero nut


 

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Status: offline 		I agree with RCIGN1, but one thing to remember is that when you use methanol mixed with gasoline the effect over the diaphragm and pumps is totally different due to the fact that gasoline adds lubricicity to those parts and you aren't using pure methanol only; its like diluting the strenght of the effect of methanol over the rubber parts. I havent seen any damage so far on my carb and I had been using it for just about two seasons and haven't had the need to replace any parts on it.

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RE: Poulan 25 from FL trimmer - 7/22/2005 5:22 PM   
RysiuM



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ORIGINAL: aero nut
I agree with RCIGN1, but one thing to remember is that when you use methanol mixed with gasoline ...
...I havent seen any damage so far on my carb and I had been using it for just about two seasons and haven't had the need to replace any parts on it.


I will give it a try. My next Poulan 25 should come today. I will cut off all aluminum parts including fuel tank mount and ignition support.
I wonder - do I need to keep a piece of flywheel (shaved to to diameter of the hub) or can crap it using hub only? With a glow plug I shoud be able to get about 2lb an engie.

If this engine weights no more than 2-1/2 lb (including glow battery, muffler and mount) and turns at least 7500 with 16 inch prop (I didn't try it with APC 18x6W yet but I think it will turn it around 7500rpm too), is it a good choice for Funtana 90?

RysiuM

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RE: Poulan 25 from FL trimmer - 7/22/2005 6:10 PM   
Rupurt



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Status: offline 		Make sure you keep your speed down on the funtana 90, two at our club have had the right wing come apart in the air. One of them had a gms 120 and the other had a moki 135

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RE: Poulan 25 from FL trimmer - 7/22/2005 8:05 PM   
RysiuM



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ORIGINAL: Rupurt
Make sure you keep your speed down on the funtana 90, two at our club have had the right wing come apart in the air. One of them had a gms 120 and the other had a moki 135


No worries, mate

7k - 8k rpm at pitch 6 is around 40 - 45 mph. Even park flyer can handle that

RysiuM

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RE: Poulan 25 from FL trimmer - 7/23/2005 8:01 AM   
RysiuM



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Status: offline 		I got another engine and just finished converting if=t for the plane. I still need to turn my prop hub and engine mount but the whole 'conversion' is done. It took me less then 2 hours. This time I took pictures for 'step by step' instruction that I posted in the thread Step by step converting Poulan 25cc FL trimmer ($25 on e-bay)

Enjoy.

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RE: Poulan 25 from FL trimmer - 7/24/2005 3:14 PM   
oslim


 

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Status: offline 		Thank you for sharing your experiences & for your Step-by-Step thread. Very useful information.

In Aug 05 Model Aviation Magazine, column The Engine Shop by Joe Wagner, there is a good discussion on Glow Plugs. Rossi, Fireball, & OS make plugs in different heat ranges. (I think I saw elswhere that Enya has plugs in 4 different heat ranges?) Also: plugs may not fire due to contamination even though they may still glow. Also: effect of moisture in glow fuel.

In Aug 05 Model Airplane News, article Engine Maintenance by Dave Gierke, Demon-Clean varnish remover is available from Cooperfuels.com

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RE: Poulan 25 from FL trimmer - 7/24/2005 4:10 PM   
oslim


 

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Status: offline 		Congratulations on your beautiful Machine Work & Fabrication.

Am not familiar w/ Motul Oil. What is the intended usage: Model Fuel?, Weed Trimmer? Motorcycle?, Marine? Is it Synthetic, Petroleum, or Castor Oil? Also, do you have address of Manufacturer or Supplier?

Thank you


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