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K&B Sportster Club

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Old 06-03-2012, 11:19 AM
  #151
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Default RE: K&B Sportster Club

Quote:
ORIGINAL: NM2K


Quote:
ORIGINAL: jeffp51

Stump pulling is what I have in mind for mine. I have 936 sq. in. of scratch built biplane that I hope the .65 sportster will pull around. I don't need speed, but I hope it will fly a plane at around 7 lbs. Other than the 12x6, what does everyone prop the engine with?


I have flown the K&B .65 Sportster swinging an 11x7 on a Sig Senior Kadet that belonged to a friend and it handled that seven pound model with ease. I also flew the same engine/model combo while swinging both a 13x6 and a 14x6 props. The latter two props were good also and they flew the model in markedly different fashion than the 11x7.

The original muffler for the Sportster series of engines were ''tuned'' a bit and optimized to produce a bit of a power boost while quieting the exhaust note. I forget now if they were tuned to out perform K&B's .61 muffler, or if they were providing a bit more power than open exhaust. It's been too many years to be sure for this old brain.


Ed Cregger
The K&B .65 Sportster will handle a 14x6 and even a 15x4 without a problem, once broken-in thoroughly. Before break-in, the engine may overheat one the larger diameter props. One of the reasons that this engine handles such a wide variety of props is because its tuning is not particnularly sharp at any point of the rpm range.


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Old 06-06-2012, 04:39 PM
  #152
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Default RE: K&B Sportster Club

Well I got the $26 Sportster 45 in the mail today.

I'll call this one Sandy because it's full of sand. Grrrrr

On the up side there is no burnt on castor oil. Ofcorse this means fuel with no castor oil was used in it. Grrrrr

I'll have to take it apart and clean it. I'm thinking a 95% chance of scored piston on this engine.

Can't wait to get it on the test stand and see how close to .9 HP I can get. I'm thinking 11,500 RPM with a 10x6.

May have to stick with NIB engines in the future.



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Old 06-06-2012, 05:20 PM
  #153
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Default RE: K&B Sportster Club


Opps almost forgot.

Don't you guys just love when a fellow modeler breaks out
the hand drill and a gouges out some big ol' holes so the bolts
that happened to be laying around can be used. Rather than
driving down to the hardware store and picking up some bolts
that perfectly fit the bolt holes in the motor's mounting beams.
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Old 06-06-2012, 05:53 PM
  #154
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Default RE: K&B Sportster Club

It could be worse.  Fortunately, if they didn't run the engine with the sand in it, it will be a lot easier to get out as you don't have ball bearings to clean out too.

If a muffler doesn't fit, make it fit.


Creative head gasket replacement, several layers of aluminum foil, and the engine didn't even need it.


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Old 06-07-2012, 07:14 PM
  #155
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Default RE: K&B Sportster Club

Man that poor old FOX should be laid to rest. yeah Amish, hope that sand is Not too much of a problem.
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Old 06-08-2012, 05:17 AM
  #156
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Yeah I used to really hate having a engine/plane dive into a sand pile or anything like that. It was nearly impossible to get the sand out of the ball bearings. It was much easier to install new bearings, as I always had to pull the bearings out to clean them out good anyway.

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Old 06-08-2012, 06:34 AM
  #157
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Default RE: K&B Sportster Club

Broke in a NIB .65 yesterday. I primed the engine and went to flip it a few times with the chicken stick but the engine started up on the first flip the first time it was ever ran. This was a joy after the bulky Super Tigre G-51 that I was breaking in last weekend.


The .65 ran well with a 11x6 wood two blade. I then moved to a MAS 11x7 3-blade and it did great. The 12x8 3-blade bogged down the engine.
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Old 06-08-2012, 07:03 AM
  #158
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Default RE: K&B Sportster Club


Quote:
ORIGINAL: AmishWarlord


Opps almost forgot.

Don't you guys just love when a fellow modeler breaks out
the hand drill and a gouges out some big ol' holes so the bolts
that happened to be laying around can be used. Rather than
driving down to the hardware store and picking up some bolts
that perfectly fit the bolt holes in the motor's mounting beams.
I have "rebushed" a couple like that with paste wax on the proper bolts (or appropriate sizedmusic wire if fully threaded bolts were tobe used)and J-B Weld.
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Old 06-08-2012, 07:21 AM
  #159
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Default RE: K&B Sportster Club

I have a friend who uses anything lying around, like wood screws. I've seen one of his engines with 4 different type of screws....on a Golden Knight that had screwdriver gouges. Yikes.
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Old 06-09-2012, 05:46 PM
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Default RE: K&B Sportster Club

Ooh, Yeah I bought a K&B 28 off Ebay that turned out to have 4 different types of screws, including a tapered head wood screw in the head. I was really mad till I looked at the single photo in the add. Everything was in the photo, I was in a hurry to get a good deal. The seller was going to take it back, but I decided to send it back to MECOA for a tradein. It had so many issues that it needed to be melted down instead of repaired . I think I had $ 15 in it with shipping. So now I have a NIB 28.
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Old 06-09-2012, 07:27 PM
  #161
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Quote:
ORIGINAL: AmishWarlord

Broke in a NIB .65 yesterday. I primed the engine and went to flip it a few times with the chicken stick but the engine started up on the first flip the first time it was ever ran. This was a joy after the bulky Super Tigre G-51 that I was breaking in last weekend.


The .65 ran well with a 11x6 wood two blade. I then moved to a MAS 11x7 3-blade and it did great. The 12x8 3-blade bogged down the engine.
My .65 started like that too... But mine would *not* turn a big prop for a gallon of fuel or more. All castor. It would get hot and quit. I ran a MAS 11x7 for a gallon on my test stand and then another gallon on an airboat. I ran a 12x6 for quite awhile.
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Old 06-10-2012, 01:04 AM
  #162
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Default RE: K&B Sportster Club

Yeah the .65 was well on the way to getting hot but I stopped before then,
but not in time to save my Hobby King onboard glow system's glowpug connector.
The boot got soft and broke. The test stand has proved to be to harsh an environment
for the little on board glow systems so I'm going to make up a simple Du-Bro clip and AA
battery pack set up.
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Old 06-10-2012, 04:34 AM
  #163
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Quote:
ORIGINAL: AmishWarlord

Yeah the .65 was well on the way to getting hot but I stopped before then,
but not in time to save my Hobby King onboard glow system's glowpug connector.
The boot got soft and broke. The test stand has proved to be to harsh an environment
for the little on board glow systems so I'm going to make up a simple Du-Bro clip and AA
battery pack set up.
I don't run mine so rich I need to leave glow hooked up. I got mine started, went WOT and richened as far as I could go without it quitting. I use a regular NiCd driver most of the time.

My 65 likes a hot plug and very little nitro. It handles 10% okay but 15% was too much. The 65 has high compression and a very short blowdown period so it should't take much nitro to get it to run well. They just need lots of time to break in. Lots of self machining going on in one of these.
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Old 06-14-2012, 01:35 AM
  #164
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Default RE: K&B Sportster Club

Got in another .45 in the mail yesterday.

This one has a really large head on it. It has
deep cooling fins and a silver metal draw clamp
on the carburetor. The prop washer is black steel also.
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Old 06-14-2012, 05:27 AM
  #165
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Default RE: K&B Sportster Club

Cleaned up the sandy .45 and test ran it this morning.

I used a MAS 10x7 3-blade prop

Sig 100% castor 25% oil 5% nitro fuel

68° Morning temp
66% Humidity
730 Feet elevation

10,600 Max RPM
4.28 Pounds of thrust
70.2 MPH EFS
.792 HP
582 Watts
198° Head temp




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Old 06-15-2012, 05:25 AM
  #166
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Default RE: K&B Sportster Club

Put a MAS 10x6 wood 2-blade on the sandy .45 this morning.
Pretty dismal performance.

68° Morning temp
65% Humidity
189° Head temp


10x6 MAS wood 2-blade
10,000 Max RPM
2.72 Pounds of thurst
56.8 MPH
.4 HP
299 Watts

You can really see how much better the 10x7 3-blade did on this engine.
Very strang how there was a drop in RPM. I'd have thought it would have went up to 12,000 RPM.
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Old 06-16-2012, 07:09 AM
  #167
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Default RE: K&B Sportster Club

Ran a MAS 3-blade 11X7 on the sandy .45 just now.

I got 9,600 RPM

5.1 pounds of thrust
63.8 MPH
.86 HP
634 Watts


For fun I tried the 12X8 MAS 3-blade on it.

6,400 RPM
3.2 pounds of thrust
48.4 MPH
.41 HP
303 Watts


So looks like the MAS 11x7 is the way to go for this engine.

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Old 06-16-2012, 11:31 AM
  #168
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Default RE: K&B Sportster Club

Tested out the .28 on a few props.


9x4 MAS nylon 2-blade
14,500 RPM
5.17 Thrust
54.9 MPH
.76 HP
558 Watts
"High heat build up" "red line"


9x5 MAS nylon 2-blade "Best Prop"
12,600 RPM
2.79 Thrust
59.6 MPH
.44 HP
327 Watts

8x6 Graupner 3-blade
11,400 RPM
1.99 Thrust
64.7 MPH
.34 HP
254 Watts

9x7 Graupner 3-blade
8,100 RPM
1.61 Thrust
53.6 MPH
.23 HP
170 Watts

So for this engine I'm going to use the 9x5 2-blade
At 2.79 pounts of thrust works out to a plane of 390²" wing area.










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Old 06-16-2012, 05:08 PM
  #169
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Default RE: K&B Sportster Club

Just curious...the .20 works so well with oversize props, do you know if the .28 will tolerate oversize props too? My .20 ran beautifully on a 12x4. Certainly not for maximum power, but useful for some scale types, or old timers.

It looks like you got a big drop in power when you went to the Graupner 9x7, so maybe not.

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Old 06-16-2012, 05:35 PM
  #170
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Default RE: K&B Sportster Club

That 9x7 Graupner sounded great.
I just knew from the sound and propwash that it was putting out some real power.
When I ran the numbers it turned out not to be doing much at all.


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Old 06-16-2012, 10:46 PM
  #171
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Default RE: K&B Sportster Club

iuse .28 engine apc 9x6 prop.
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Old 06-23-2012, 05:49 AM
  #172
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Default RE: K&B Sportster Club

Wow on sale for only $47.60!!!

What an amazing price for an old, oxidized, gummed up engine that's only missing a glow plug, muffler, shim, and prop driver.

"Description

KB A 65 with Good Compression - well lubed - carb moves freely! RC Plane Engine

For RC use/Collectors use"

This means it has good compression when the motor is full of oil "well lubed"
It's amazing that the crab moves being in such bad shape!!!
Yes what RC engine collector wouldn't want a K&B Sportster, much less a used, dirty one that is missing parts.

http://www.ebay.com/itm/K-B-KB-A-65-...item20c6f0aa5f


I'm thinking you guys should pass on this engine.


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Old 06-23-2012, 03:15 PM
  #173
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Default RE: K&B Sportster Club

Not a good deal with the price at $68, it wasn;t $47 like you stated. I would rather buy a new one or nearly new one as they sell for only a little more than that price.
But even at $47 it wasn't really a good deal, it could be all ragged out on the inside from lean runs, etc.

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Old 06-23-2012, 04:47 PM
  #174
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Default RE: K&B Sportster Club



I made up some jug labels today to keep my Sportster fuel separated from my Sport fuel.
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Old 06-23-2012, 06:59 PM
  #175
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That is pretty cool.The labels look good.

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