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RC Airboat World
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Bob Dreesen
Joined: 15 Nov 2009
Posts: 70
Location: Lincoln Ne.
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 Posted: Sun Feb 07, 2010 3:33 pm Post subject: bob dreesens chainsaw questions! |
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hey crispy I made it over here,  Keep in mind I ain't the sharpest knife in the drawer when it comes to these MOST WONDERFUL COMPUTERS. 
Well I will give the clutch a little harder wack. 
I think for now I will leave the flywheel in tact.
The muffler I had intended to remove any restrictions, and probably make the outlet larger, really haven't checked it out yet.
Being I still am learning all the terminology. I assume a prop backer is a shaft extension Or as Hobbytown calls it, a prop adapter.
I will have to get mine apart more to check shaft length etc.
Hey friend thanks for all the help.  You are a wealth of knowledge, especially on these chain saws.
I didn't know RC AIR BOATS existed before last Nov. I hope it catches on around here. Hobbytown sure don't know anything about them. The owner of Hobbytown here isn't a bit of help, and acts like he couldn't care less.
I really don't want to change engines now that I have my boat all done,
but I am not sure this Homelite is going to have the guts to move this BEHEMOTH 26+- lb boat.  It sure is pretty to look at.
Maybe I should just mount it on the wall in my office
Have a great day
bob d |
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crispyspa
Joined: 10 Jan 2007
Posts: 2156
Location: Onalaska, Wi. USA
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| Posted: Sun Feb 07, 2010 7:17 pm Post subject: |
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The prop backer is a specific part I thought up for this style of chainsaw.
The shaft on the engine becomes the prop shaft because it is so long.
You can see it in this pic:
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The gene pool could use a little chlorine. |
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Bob Dreesen
Joined: 15 Nov 2009
Posts: 70
Location: Lincoln Ne.
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| Posted: Mon Feb 08, 2010 12:31 am Post subject: |
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| crispyspa wrote: | The prop backer is a specific part I thought up for this style of chainsaw.
The shaft on the engine becomes the prop shaft because it is so long.
You can see it in this pic:
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crispy
nice looking prop backer. Now I know what it is. .
I got the clutch off, it took 2 healthy wacks with the hammer and punch.
This shaft measures 1.75'' from bearing seal to the end of shaft.
Then measuring from the outside in.
The threaded end is 5/16''diameter.
Threads are 17/32''long.
From threads to the end of the first shoulder is 13/32''.long and 14/32''in diameter.
The inside shoulder is 11/16''to bearing seal long, and 7/16''diameter.
Well I hope that is as clear as mud. 
Did you cut the case right where the handle is molded on? Or in farther,
because if I would cut any farther in I will cut the only mounting screw off of the rope starter on the right side of the starter housing. 
bob d
PS the speed of light is [299792458 M/S]!
So that makes the speed of dark [the same as the speed of light]
Because as light leaves, darkness follows at the same rate.
That is just my non scientific answer. |
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crispyspa
Joined: 10 Jan 2007
Posts: 2156
Location: Onalaska, Wi. USA
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| Posted: Mon Feb 08, 2010 2:01 pm Post subject: |
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14/32? LOL you mean 7/16?
Do you have a micrometer? I need measurements in thousandths.
Do you know any machinists? If not, I THINK the extra prop backer I have will work, I just need closer measurements and a picture to be sure.
I made a video of the engine:
http://www.youtube.com/watch?v=Q1RjevBeoD0
If you are having quandaries about cutting the case, post a video like the one above and I'll have a look.
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The gene pool could use a little chlorine. |
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crispyspa
Joined: 10 Jan 2007
Posts: 2156
Location: Onalaska, Wi. USA
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| Posted: Mon Feb 08, 2010 2:04 pm Post subject: |
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| Bob Dreesen wrote: |
PS the speed of light is [299792458 M/S]!
So that makes the speed of dark [the same as the speed of light]
Because as light leaves, darkness follows at the same rate.
That is just my non scientific answer. |
Great...now I gotta' change my sig. LOL
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The gene pool could use a little chlorine. |
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Bob Dreesen
Joined: 15 Nov 2009
Posts: 70
Location: Lincoln Ne.
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| Posted: Mon Feb 08, 2010 10:27 pm Post subject: |
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| crispyspa wrote: | 14/32? LOL you mean 7/16?
Do you have a micrometer? I need measurements in thousandths.
Do you know any machinists? If not, I THINK the extra prop backer I have will work, I just need closer measurements and a picture to be sure.
I made a video of the engine:
http://www.youtube.com/watch?v=Q1RjevBeoD0
If you are having quandaries about cutting the case, post a video like the one above and I'll have a look. |
Hi crispy,  Well ya, I meant 7/16, well I know now anyway. Just didn't break it down. 
I don't know of any machinist right off hand but I am sure I could track one down.
Your video looks just like mine.
Is the fact that you eliminated the top screw mount on the starter housing make it a little flimsy
I do not have a metric mic., only a SAE.
I have to go across town tomorrow, and I will go right past Harbor Fright.
I will stop and pick up one with a dial indicator. The ones they have look pretty good.
I will let you know what the shaft mikes in metric.
Today was cold and windy, about -5 but the snow was just right for testing the boat on a nearby double ball diamond. It ran really well. This boat is not about to flip.
I ran it really hard for about 40min. hard enough to burn my new high heat paint off the muffler,.paint on the cyl fins stayed fine.
I pulled the plug and it was burning a very clean nice tan color, just like it should.
When I got this motor running several months ago. Compression was at 90-95 lbs. Pretty weak.
Today after 40min of hard running, just for fun I pulled another compression check it was 120 lbs.  The ring might have been stuck just a little.
Sounded like it was turning pretty high rs.
Ill be in touch, and thanks for the info and the vid.
bob d |
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crispyspa
Joined: 10 Jan 2007
Posts: 2156
Location: Onalaska, Wi. USA
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| Posted: Mon Feb 08, 2010 11:59 pm Post subject: |
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| Quote: | I do not have a metric mic., only a SAE.
I have to go across town tomorrow, and I will go right past Harbor Fright. |
All measurements are SAE.. I just forgot to add the .0 .
So the diameters are (left to right) .047, .045, .039, .030.
As long as you are going to harbor freight, they have a pretty good digital 6"composite vernier caliper for 10 bux. (If you don't plan on using it very much)
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93293
or a 4" stainless steel digital one for 20 bux.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=47256
| Quote: | | Is the fact that you eliminated the top screw mount on the starter housing make it a little flimsy |
It's not real flimsy, it's actually pretty firm as long as the bottom mount is solid. I've never had a problem.
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The gene pool could use a little chlorine. |
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RS 38-40
Joined: 12 Jan 2007
Posts: 21
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| Posted: Tue Feb 09, 2010 8:16 pm Post subject: |
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Crispy you were rite the first time . .450 is just under 1/2" .045 is just a little bigger than 1/32"
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George |
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crispyspa
Joined: 10 Jan 2007
Posts: 2156
Location: Onalaska, Wi. USA
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| Posted: Tue Feb 09, 2010 8:20 pm Post subject: |
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LOL. You are right George. I haven't had to work with dimensions like that for a while...still laid off. Plus look at the time I posted and my BAC had to be over the limit at that time too. LOL AH well.
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Bob Dreesen
Joined: 15 Nov 2009
Posts: 70
Location: Lincoln Ne.
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| Posted: Tue Feb 09, 2010 9:13 pm Post subject: |
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| crispyspa wrote: | | Quote: | I do not have a metric mic., only a SAE.
I have to go across town tomorrow, and I will go right past Harbor Fright. |
All measurements are SAE.. I just forgot to add the .0 .
So the diameters are (left to right) .047, .045, .039, .030.
As long as you are going to harbor freight, they have a pretty good digital 6"composite vernier caliper for 10 bux. (If you don't plan on using it very much)
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93293
or a 4" stainless steel digital one for 20 bux.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=47256
| Quote: | | Is the fact that you eliminated the top screw mount on the starter housing make it a little flimsy |
It's not real flimsy, it's actually pretty firm as long as the bottom mount is solid. I've never had a problem. |
I'm sorry, did I read you wrong about needing metric measurements?
No matter. I picked up a $30.00 CEN-TECH model # 98563 6'' digital read out caliper on sale for $20.00, really a nice mic. nice hard padded case and all. I've wanted a good one for some time.
All my measurements are the same as yours. You don't show a threaded measurement for length, but mine is .545 and that is probably the same as yours.
I'm thinking we have the same basic engine. What is the C.C. on yours
What do you want for the prop backer, if you think it will work, I am sure it will, if you are.
A tune up tip!
I talked to a friend of mine who has owns his own 6 bay auto repair bus.
He has been into RC GAS and NITRO cars for years plus micro midget, and go cart racing. He said I might try to run my Homelite, without a cylinder gasket for more compression, and to get some "Permatex ANAEROBIC gasket maker", to replace the gasket. It will mate both metal surfaces, and will seal better than a gasket. It removes easily on dis assembly.
He said it should give a little more low end power, and probably won't hurt top end.
So I am going to try that, and I have bought a new piston ring. So stay tuned and I will give reports when possible.
I know how it performed yesterday on the snow, and I know what the compression is now. So we will see. Sounds like a fun challenge. And I love these simple ones. If it don't work all I have to do is replace the gasket. They are about 18 thousands thick.
I can't wait to get this on the water. Well that will be a while. Then I will know weather to go to the POLAN
Let me know your thoughts 
They are much appreciated
bob |
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crispyspa
Joined: 10 Jan 2007
Posts: 2156
Location: Onalaska, Wi. USA
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| Posted: Tue Feb 09, 2010 10:56 pm Post subject: |
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Pm me your address and I'll send you the prop backer. Pay the shipping and we'll call it even.
The one in the video is a 36cc. The one on Kamacopy is 42cc.
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The gene pool could use a little chlorine. |
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Bob Dreesen
Joined: 15 Nov 2009
Posts: 70
Location: Lincoln Ne.
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| Posted: Wed Feb 10, 2010 3:18 am Post subject: |
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| crispyspa wrote: | Pm me your address and I'll send you the prop backer. Pay the shipping and we'll call it even.
The one in the video is a 36cc. The one on Kamacopy is 42cc. |
Sounds like I can't beat a offer like that
Thanks so much crispy, I owe you one |
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