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Weedeater 25

Old 12-02-2003, 06:20 PM
  #26  
teufelhund
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Default RE: reply to teufelhund

Hey BB, where did you find the carb mount?
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Old 12-02-2003, 08:28 PM
  #27  
bbbrown
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Default RE: reply to teufelhund

Try contacting scottbaldridgeconversions.com
He has carb mounts, prop hubs, prop washers etc.
BB
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Old 12-02-2003, 09:59 PM
  #28  
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Default RE: reply to teufelhund

bbbrown,

Just curious;how did it balance out laterally? It seems like with your setup, you would have to add a buch of weight to counterbalance the head.

-Zip
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Old 12-03-2003, 11:09 AM
  #29  
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Default RE: reply to teufelhund

Not done building yet. Wouldn't be any differant than a side mount. Since this plane will have two battery packs a 1100 and a 1300, the batteries will be used to establish ballance. I'll give an update when completed..sometime in a week or so.
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Old 12-03-2003, 09:49 PM
  #30  
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Default RE: reply to teufelhund

Thanks for the info, got one on the way.
Ben
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Old 12-05-2003, 12:11 PM
  #31  
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Default RE: reply to teufelhund

I need to make a prop hub for my Weedy 25. I have a lathe and the billet stock. I just need dimensions. Anybody out there that can help me out? I am using the stock flywheel, trimmed down of course.

Much thanks,

Todd
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Old 12-05-2003, 03:10 PM
  #32  
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Default RE: reply to teufelhund

Rather than measure one, what about measuring yourself what you need?

Assuming its a short shaft, You will need to accommodate the threads (5/16 - 24) that are sticking beyond the hub of the flywheel. Twice this length will give you enough threads on the other end for the prop stud. The major diameters should be the size of the hub on the prop. The minor diameter should be enough to support the threads and provide strength against bending.

The ones I have for a long shaft have a clearance hole for the 3/8" shaft all the way through them. The length is to W I L A R or to the length you desire. You thread the shaft back to where there is a need to have threads 3/8 - 16 and saw what's not needed off the front.

Some of the foreign engines may be metric?

If you still need me to measure one, I can for you?

Jim
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Old 12-05-2003, 03:58 PM
  #33  
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Default RE: reply to teufelhund

W8ye,

Thanks for the input. I think I can figure what I need from your suggestion.

I guess I didn't think it would be so straight forward.

Todd
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Old 12-07-2003, 01:56 PM
  #34  
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Default RE: reply to teufelhund

Hey glowplugboy! what are the mod's that you make on your weedeater"s to develop 9400 rpm's, I am only getting 8200 with a 15x8 master airscrew prop
on mine and that is with a bigger carb and a partially open muffler; maybe I need to completely remove all the guts from inside the muffler?
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Old 02-25-2004, 04:23 PM
  #35  
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Default RE: Weedeater 25

Hi
I have read this thread and have bought the Weedeater 25 instead of Homelite 25, this is my first love in weedeater engines for weight reasons.
I have converted it and have changed the stock carb , useless I have read in other forums because of fixed jets, I start thread to obtain details to enlarge throat but no replies, and KISS, take a Zama carb with High and Low needles of aprox 11 mm throat and changed.
I cut the aluminium of block , cut the fins of flywheel and balanced , make a prop hub in lathe shop ,make a velocity stack of plastic pieces (like of Zenoah 26 in the photo of Horizon Hobby site), mount the engine in an aluminium sheet and the sheet screwed to the test stand.
At sea level , stock flywheel ignition, with extra gas and SAE 40 automotive oil at 5% to break in process and to avoid danger of lean run when touching needles and after 1/3 gallon I measured with a fish scale 9 pounds of thrust and 7250 rpm with a glo bee tach. Spark plug is stock Champion RJC6Y. The ports are stock and open exhaust.
I am making a curved metal tube 6 inch long to use like exhaust, a bit more than 3/4 inch inside diameter, not finished yet, I have no noise problems.
Like to start wet and I learned in RCU in other thread how to start with a stick with a soft cover, you must put the prop near vertical 45 degree aprox before TDC and with a hard push with stick the thing start,and yes it works, thanks RCU.
Also I start with hand and two gloves but it hurt and between these I start with a shoe with soft base put over hand and "kick" the prop.Imagine the faces at flying field.
Notice , I make my own props and the 9 pounds thrust is measured with a 16X6 wide (40 mm and the tips are tapered at 28 mm wide in the last 60 mm of the blade.
Are my numbers right? or I have an error.
Many thanks for your time
Have fun
Jose
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Old 02-26-2004, 12:33 AM
  #36  
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Default RE: Weedeater 25

Jose! do not use automobile oil(4 stroke) because it can damage your engine, this oil contains additives that can attack the aluminum of our 2 stroke engines, besides the low rpms you are getting is due to the fact that motor oil does't burn as clean as 2 stroke engine oils these are ashless and burn cleaner without robbing engine performance, use this oil in a 32:1 ratio and it should give very good protection against lean runs, try it and see the improvements in your numbers, also it would help if you can eliminate some of the inside dampers of your muffler, take the screen off the muffler exit and make a 1/2 inch hole that runs through the inside of the muffler, I did that to mine and it helped alot.
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Old 02-26-2004, 02:32 PM
  #37  
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Default RE: RE: reply to teufelhund

Hi
Aeronut
Many thanks for your advise, you save my engine, in the club a friend also dont like the automotive oil in Weedeater.

I will switch for Chevron two stroke oil.
I am running the engine with open exhaust, no muffler, no complaints with noise
I will replace the muffler with a bended tube of 6 inches long 3/4 inch ID.
I dont like to have much more rpm , may be 500 rpm more.
I have read the owners manual of Zenoah 23 or 26 , do not remember , airplane version, and they say:
" put a prop that give between 7000 and 8500 rpm in the ground"
I believe it is for no overspeed in the air. And I believe the Zenoah is a lot more sturdy than my Weedeater.
Any numbers of other weedeater 25?
Many thanks for your time
Jose
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Old 07-17-2004, 11:26 AM
  #38  
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Default RE: reply to teufelhund

July already and I am just now getting around to flying the yellow Stingray mentioned in the previous postings. I flew it today for the first time. Three flights. The WEEDEATER 25cc with CH ignition was turning 6800 rpm with a 16x8 prop. Takeoff was good, lifting off in a 100ft rollout. Performance was more than I had hoped for. Enough power to do loops, cuban eights and more. I am completely satisfied with the WEEDEATER 25cc engine on a plane this size. And the best part, no messy cleanup.
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Old 07-23-2004, 09:20 AM
  #39  
tatolazo
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Default RE: Weedeater 25

Hi:
I was wondering who´s Pete. And if he still selling the big bore carbs:

Mr. Piper Cub wrote: "The one Pete sells is $18 with shipping! Cheap price for 2000rpm isn't it?"

It seems a very nice price for me fot that carbs.

Any web page???
Hope anyone could help.

Thanks

Tato Lazo
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Old 07-23-2004, 09:24 AM
  #40  
jstanton
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Default RE: Weedeater 25

You can contact Pete at www.wackerengines.com. His e-mail address is on his web site
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Old 07-23-2004, 09:56 AM
  #41  
tatolazo
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Default RE: Weedeater 25

OOOHHH, I knew wackwer engines, didn´t know the name of the owner or workers there.
I will check them, but seems to me that the big bore carbs are rated at $30.00.
Did they ever was priced $18.00 ????

Anyway, seems a nice deal. will have them in mind when i decided to improve the rpms in my homie.

Tatolazo.
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