Glow head brotherhood.
#1251
I don't understand why the old K&b 61 could not be ported for 13x5 props too, that's a good prop for the HP 61 PDP which is based on it. Maybe it's just that Mr. Lee only does porting for high rpm applications. Apparently the Twister is not better on small props, but it is better on large props.
Yes, the Sportster can turn a 13x5, but not nearly as well as a Twister 61, and it is much heavier. I hoped my K&B 61 could be made to run more like a Twister, but apparently that is not what is offered.
Jim
Yes, the Sportster can turn a 13x5, but not nearly as well as a Twister 61, and it is much heavier. I hoped my K&B 61 could be made to run more like a Twister, but apparently that is not what is offered.
Jim
#1252
I am not familiar with those motors, but am pretty sure they are all 1970's technology, so however well made they are, you can only expect so much. They were fine, and even hard to beat in their day though.
#1253
but am pretty sure they are all 1970's technology,
#1254
My Feedback: (8)
What pretty much killed true chrome-plated bores was the fact that hard-chrome plating produces highly toxic and hazardous byproducts that are expensive to legally dispose of anywhere but mainland China. In order to compete on price, O.S. was forced to abandon true chrome for their sport engines, to our detriment. Treated properly, ABL engines aren't bad, but I'll take chrome anytime.
#1255
From what I remember in the 70's (man) ABC and schneurle was just a new thing. PDP just started and was quickly outdated in a couple of years. My Rossi had a steel piston cyl. and the ABC was an option. This was the late 70's. K&B .40 was the ruler in pylon for instance, until the schneurle came out. Then it was nothing, when even K&B had to update to schneurle. We stopped chroming at work when the cost of dumping exceeded the cost of buying it, (and you couldn't just dump it in the back field) Even the cleaning solutions are hard to get rid of now. We had huge tanks of heated trichlorethane that must have been dumped somewhere when it was too oily. I remember sticking my head inside the tank to hunt for dropped parts with the smoky haze. Good times? The 80's had some nice designs, and many different companies, then it was all CNC stuff to be more profitable, and then naturally the little guys with the standard machines thinned out. Really, now the motors are pretty good, and cost effective, even with the nickel and crappy bearings. It would have been unheard of to have any warranty more than 30 days then. Now 20 gallons of fuel is considered normal before new bearings are needed, and there are still complaints about bearing quality.
Last edited by aspeed; 05-19-2015 at 01:47 PM.
#1256
What pretty much killed true chrome-plated bores was the fact that hard-chrome plating produces highly toxic and hazardous byproducts that are expensive to legally dispose of anywhere but mainland China. In order to compete on price, O.S. was forced to abandon true chrome for their sport engines, to our detriment. Treated properly, ABL engines aren't bad, but I'll take chrome anytime.
#1257
What pretty much killed true chrome-plated bores was the fact that hard-chrome plating produces highly toxic and hazardous byproducts that are expensive to legally dispose of anywhere but mainland China. In order to compete on price, O.S. was forced to abandon true chrome for their sport engines, to our detriment. Treated properly, ABL engines aren't bad, but I'll take chrome anytime.
#1258
I guess the high volume sport engines are ok with the nickel, unless they get too hot. Still the cost is the same as a "real" motor, and I think they could splurge on chrome.
#1260
The higher rpm PDP hybrid does have a different crankshaft, so perhaps the regular PDP .61 is better as a lugger and the PDP hybrid is better for go-fast piped applications.
I have a couple HB .61s which are said to be basically a West German version of a K&B .61. Neither of mine are PDP though. One is gonna be used in my Mig-27 Foam target drone plane. Easy starter and good runner albeit the muffler is pretty "barky". I wonder if the K&B variants use a different muffler?
I have a couple HB .61s which are said to be basically a West German version of a K&B .61. Neither of mine are PDP though. One is gonna be used in my Mig-27 Foam target drone plane. Easy starter and good runner albeit the muffler is pretty "barky". I wonder if the K&B variants use a different muffler?
#1261
A K&B 61 with its stock muffler will wake the dead. That's one reason I'd like to be able to run a larger prop on it. A Bisson muffler might help too.
The 65 Sportster muffler will fit; I don't know if it would help any.
The 65 Sportster muffler will fit; I don't know if it would help any.
#1262
The sportster muffler is very good at quieting the noise, but on almost any other engine it will likely limit power. But I wouldn't know for sure until I tried it. The sportster engine was designed with that muffler in mind. I didn't see a big gain in rpm running a .65 without the muffler (but I did get an appreciation for hearing protection. I always wear it running engines).
#1263
My Feedback: (3)
I have a couple HB .61s which are said to be basically a West German version of a K&B .61. Neither of mine are PDP though. One is gonna be used in my Mig-27 Foam target drone plane. Easy starter and good runner albeit the muffler is pretty "barky". I wonder if the K&B variants use a different muffler?
#1264
The two HB .61s I have are slightly different. The one that came to be unrun is twin ball raced. The other, though not confirmed, I suspect is ball raced in the rear and a bushing up front. It is said the drone HBs had a rear BB and a bushing in the front that can be removed and a correct sized BB installed. The unrun HB came with an HB carb, the other had no carburetor. I swapped the HB carb and muffler to the used one I suspect as being a drone engine and it throttled poorly. I adjusted the needles quite a bit and never got it to throttle in the midrange well. I'm unsure what's wrong with it but may be the reason I acquired it. It has good compression and turns over pretty smooth.
The pair of Sportster .65s I have are from the most recent drone planes from around '91. One is unrun and the other has about 4-5 gallons through it and runs really sweet with a good carb in it. The drone carbs are junk.
#1266
Both of mine are Dykes ringed. I have to finish breaking the one in so I can bolt it to my Mig target drone so I can fly it. Need to dump these 1/4 scale servos or trade them so I can get some standard servos for it.
#1267
Thread Starter
Join Date: Jun 2012
Location: Bristol, CT
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No glow talk lately, eh? OK, ill bite. Just picked up a pretty sweet little motor. A YS supercharged F120. Completely rebuilt by YS just two months ago. Needs to be broken in still, but will fly soon. The only thing wrong is two broken (or filed) fins. I picked it up for less than the amount on the slip for the rebuild. Cant wait to hear it. Anyone have experience with this engine? Im debating on going back for the 140 he has, but it has a hefty price tag.
#1271
I'm no YS guy, but I will be burning a whole lot of fuel over the 4th weekend. Going with over 3 gallons and hoping to come back empty. Gonna run a .20, .26, .28, .29, .35, .46, and a .56. And my buddy is bringing a 5+HP electric boat. I told him he's a wuss for running all electric gear.
#1272
No glow talk lately, eh? OK, ill bite. Just picked up a pretty sweet little motor. A YS supercharged F120. Completely rebuilt by YS just two months ago. Needs to be broken in still, but will fly soon. The only thing wrong is two broken (or filed) fins. I picked it up for less than the amount on the slip for the rebuild. Cant wait to hear it. Anyone have experience with this engine? Im debating on going back for the 140 he has, but it has a hefty price tag.
Sincerely, Richard
AMA 861960
Cub Brotherhood #187; Sig 1/4 (Koverall/dope), H9 100 inch (Gen 1) (Solartex/?), GB Anniv Cub (NIB)
Club Saito #635; Saito 56, 100, 120abc, 130T, 180
YS F 120
P-47 Brotherhood #(applied for)
Last edited by spaceworm; 06-29-2015 at 04:24 PM. Reason: added pic of my YS-F120
#1275
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Join Date: Jun 2012
Location: Bristol, CT
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Hey Mikey. Cant believe it took ya this long to find your own kind. Welcome along. Ill have to look back and figure out the last number given. Hey, did you ever find a home for that little engine i sent?