Which fast .50 2-stroke for Nemesis?
11-10-2010, 02:51 PM
#51
RE: Which fast .50 2-stroke for Nemesis?
I think I would love this plane with a TT 75 four stroke. Small high pitched prop. Lots of nitro. Should get 10,000 RPM with maybe a 11 x 12 prop. That should be well over 100 MPH. No muss with pipes either and it would sound very much like the overreved flat four banger the full scale uses.
11-10-2010, 03:50 PM
#52
RE: Which fast .50 2-stroke for Nemesis?
Well, I think we have the poor OP totally confused now...
So far we have all demonstrated how we would all use a different engine for the same application.
I do like the heli engine idea as it can be fairly low cost. But I wonder id the heli-head will clear the cowl or not. Maybe it doesn't matter.
So far we have all demonstrated how we would all use a different engine for the same application.
I do like the heli engine idea as it can be fairly low cost. But I wonder id the heli-head will clear the cowl or not. Maybe it doesn't matter.
11-10-2010, 03:57 PM
#53
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: Sport_Pilot
I think I would love this plane with a TT 75 four stroke. Small high pitched prop. Lots of nitro. Should get 10,000 RPM with maybe a 11 x 12 prop. That should be well over 100 MPH. No muss with pipes either and it would sound very much like the overreved flat four banger the full scale uses.
I think I would love this plane with a TT 75 four stroke. Small high pitched prop. Lots of nitro. Should get 10,000 RPM with maybe a 11 x 12 prop. That should be well over 100 MPH. No muss with pipes either and it would sound very much like the overreved flat four banger the full scale uses.
That's an interesting setup. I have a TT 75FS on a 3D plane (U-Can-Do 46) and I never thought it could do high speed planes. An 11x12 prop is pretty wild. Of course, when you look at the TT 4-strokes, they seem to be designed for higher rpms than other 4-strokes with their bigger bores and shorter strokes.
11-10-2010, 04:06 PM
#54
RE: Which fast .50 2-stroke for Nemesis?
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
11-10-2010, 04:10 PM
#55
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: Sport_Pilot
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
11-10-2010, 04:27 PM
#56
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: Sport_Pilot
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
You can take a 11x12 and cut it down and shave it as needed to get a smaller prop.
11-10-2010, 04:32 PM
#57
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: earlwb
You can do like we used to do, make our own props, or modify an existing prop. When i was pylon racing just about everyone was coming out with custom props for the races. Most guys covered their engine with a towel, obsensively to keep it clesn, but they were really hiding their custom prop from the competition.
You can take a 11x12 and cut it down and shave it as needed to get a smaller prop.
ORIGINAL: Sport_Pilot
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
Not sure if a 11x12 would work, might be too much prop. I was originally looking for a 10-12 but could not find one. Perhaps an 11x10.
You can take a 11x12 and cut it down and shave it as needed to get a smaller prop.
But seriously, what about the fact that the pitch angle on the prop varies along the length of the blade? I that a factor to consider?
11-10-2010, 04:36 PM
#58
RE: Which fast .50 2-stroke for Nemesis?
Everyone had a prop pitch gauge to double cheak the pitch, plus it let you try different profiles. Anything so you could beat the other guy by a nose.
One problem with the props is they vary in pitch from prop to prop or even production runs. So you needed to carefully check all your props and match them up as close as possible.
here is one example: http://www.mh-aerotools.de/airfoils/propgeo5.htm
or
http://winshiprc.tripod.com/propeller_page.htm
or
http://www.mh-aerotools.de/airfoils/pylonprops_2.htm
The Prather Pitch gauge is usually the one most guys use in the USA.
http://www.quicktechhobby.com/Airpla...r_products.htm
One problem with the props is they vary in pitch from prop to prop or even production runs. So you needed to carefully check all your props and match them up as close as possible.
here is one example: http://www.mh-aerotools.de/airfoils/propgeo5.htm
or
http://winshiprc.tripod.com/propeller_page.htm
or
http://www.mh-aerotools.de/airfoils/pylonprops_2.htm
The Prather Pitch gauge is usually the one most guys use in the USA.
http://www.quicktechhobby.com/Airpla...r_products.htm
11-10-2010, 04:40 PM
#59
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: earlwb
Everyone had a prop pitch gauge to double cheak the pitch, plus it let you try different profiles. Anything so you could beat the other guy by a nose.
One problem with the props is they vary in pitch from prop to prop or even production runs. So you needed to carefully check all your props and match them up as close as possible.
Everyone had a prop pitch gauge to double cheak the pitch, plus it let you try different profiles. Anything so you could beat the other guy by a nose.
One problem with the props is they vary in pitch from prop to prop or even production runs. So you needed to carefully check all your props and match them up as close as possible.
11-10-2010, 10:58 PM
#61
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: airraptor
anything more than a 10'' pitch on this plane is not the right set up for that TT75 4S. a 12x9 apc would be a great choice or a 13x8 APC as well.
anything more than a 10'' pitch on this plane is not the right set up for that TT75 4S. a 12x9 apc would be a great choice or a 13x8 APC as well.
11-11-2010, 12:16 AM
#62
Senior Member
My Feedback: (14)
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: earlwb
hey, nice going. i always like to read or hear about guys doing what you all did. Nice to know the .Magnum .52 can turn up some rpms.
More power to ya.
I think the problem today is that the big bore 50's and above have evolved more for turning large props well, so they can reduce prop noise and also with lower RPMs the mufflers help quiet the engines better too. So thus the manufacturers have been boring the engines out more and more to get that marketing competitive advantage. It is where the fickle modeller goes into the hobby shop and sees a .50 engine and a .52 engine, he'll very likely buy the .52 as it is perceived to be more powerful than the .50. So we wind up seeing where the engines keep getting bored out ever more.
But there are performance engines still out there, even some good deals on older engines from when RPMs were more the rule and noise, and if someone was really wanting to smoke the crowd at their flying field, they'll have to pony up the bucks for the real high performance engines.
hey, nice going. i always like to read or hear about guys doing what you all did. Nice to know the .Magnum .52 can turn up some rpms.
More power to ya.
I think the problem today is that the big bore 50's and above have evolved more for turning large props well, so they can reduce prop noise and also with lower RPMs the mufflers help quiet the engines better too. So thus the manufacturers have been boring the engines out more and more to get that marketing competitive advantage. It is where the fickle modeller goes into the hobby shop and sees a .50 engine and a .52 engine, he'll very likely buy the .52 as it is perceived to be more powerful than the .50. So we wind up seeing where the engines keep getting bored out ever more.
But there are performance engines still out there, even some good deals on older engines from when RPMs were more the rule and noise, and if someone was really wanting to smoke the crowd at their flying field, they'll have to pony up the bucks for the real high performance engines.
Truthfully, the Magnum .52 two-stroke can out perform quite a few of the old high rpm standard engines when running a 10x6 prop. Someone "smoking" an engine is almost always their fault and not the fault of the engine. I've seen plenty of folks run 25 to 30% (or more) nitro through an FAI set up two-stroke and end up smoking the engine.
Oh, if anyone has an NIB kit of the Hansen (designed/not sold) Great Planes "Tiporare" with a fiberglass fuselage and a built-up wooden wing lying about, please contact me. They were sold by Great Planes in the early eighties. I have been called a liar with the thread being closed so that I couldn't offer a rebuttal. I have a point to prove.
Ed Cregger
11-11-2010, 12:19 AM
#63
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: airraptor
anything more than a 10" pitch on this plane is not the right set up for that TT75 4S. a 12x9 apc would be a great choice or a 13x8 APC as well.
anything more than a 10" pitch on this plane is not the right set up for that TT75 4S. a 12x9 apc would be a great choice or a 13x8 APC as well.
11-11-2010, 08:49 AM
#65
Senior Member
My Feedback: (14)
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: the Wasp
Ed,, they can't say they were not made,,
http://www.google.com/images?hl=en&s...=&oq=&gs_rfai=
Jim
Ed,, they can't say they were not made,,
http://www.google.com/images?hl=en&s...=&oq=&gs_rfai=
Jim
Thanks, Jim. Case closed.
Ed Cregger
11-11-2010, 09:17 AM
#66
RE: Which fast .50 2-stroke for Nemesis?
I remember the Tiporare, I almost bought one to use many years ago.
But at that time I was into more bulbous fuselages to enclose the tuned pipe inside with rear exhaust engines.
So I wound up using MK Arrows towards the end of my pattern days. I was a proponent of trying to streamline the plane as much as possible.
A pic of the Mk Arrow that Wolfgang Matt designed and flew.
But at that time I was into more bulbous fuselages to enclose the tuned pipe inside with rear exhaust engines.
So I wound up using MK Arrows towards the end of my pattern days. I was a proponent of trying to streamline the plane as much as possible.
A pic of the Mk Arrow that Wolfgang Matt designed and flew.
11-11-2010, 09:18 AM
#67
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: NM2K
Thanks, Jim. Case closed.
Ed Cregger
ORIGINAL: the Wasp
Ed,, they can't say they were not made,,
http://www.google.com/images?hl=en&s...=&oq=&gs_rfai=
Jim
Ed,, they can't say they were not made,,
http://www.google.com/images?hl=en&s...=&oq=&gs_rfai=
Jim
Thanks, Jim. Case closed.
Ed Cregger
11-11-2010, 09:45 AM
#68
Senior Member
RE: Which fast .50 2-stroke for Nemesis?
Hsukaria,
I believe you can go to the [link=http://www.rcuniverse.com/forum/forumid_514/tt.htm]Pattern forum[/link] and look there.
It is based on Hanno Prettner's [link=http://www.google.com/search?client=ubuntu&channel=fs&q=hanno+prettner+curare&ie=utf-8&oe=utf-8]Curare[/link].
The [link=http://www.rcuniverse.com/forum/m_2827386/tm.htm]Tiporare[/link] was flown by competitors in the '70s and the '80s.
I believe you can go to the [link=http://www.rcuniverse.com/forum/forumid_514/tt.htm]Pattern forum[/link] and look there.
It is based on Hanno Prettner's [link=http://www.google.com/search?client=ubuntu&channel=fs&q=hanno+prettner+curare&ie=utf-8&oe=utf-8]Curare[/link].
The [link=http://www.rcuniverse.com/forum/m_2827386/tm.htm]Tiporare[/link] was flown by competitors in the '70s and the '80s.
11-11-2010, 09:49 AM
#69
RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: DarZeelon
Hsukaria,
I believe you can go to the [link=http://www.rcuniverse.com/forum/forumid_514/tt.htm]Pattern forum[/link] and look there.
It is based on Hanno Prettner's [link=http://www.google.com/search?client=ubuntu&channel=fs&q=hanno+prettner+curare&ie=utf-8&oe=utf-8]Curare[/link].
The [link=http://www.rcuniverse.com/forum/m_2827386/tm.htm]Tiporare[/link] was flown by competitors in the '70s and the '80s.
Hsukaria,
I believe you can go to the [link=http://www.rcuniverse.com/forum/forumid_514/tt.htm]Pattern forum[/link] and look there.
It is based on Hanno Prettner's [link=http://www.google.com/search?client=ubuntu&channel=fs&q=hanno+prettner+curare&ie=utf-8&oe=utf-8]Curare[/link].
The [link=http://www.rcuniverse.com/forum/m_2827386/tm.htm]Tiporare[/link] was flown by competitors in the '70s and the '80s.
11-12-2010, 01:05 AM
#71
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RE: Which fast .50 2-stroke for Nemesis?
Thanks everybody, lots of info to digest here. Now I got a few flying buddies interested so it looks like we'll be ordering more than one engines!
To narrow it down and be more specific I don't intend to race, just to smoke the 55AX guys and still have control of the thing. So how would you rate the mentioned engines (Webra/Weston, Jett, Rossi, ASP/Magnum, OS SX, OS Heli) on:
- User friendliness (break-in, tuning)
- Fuel and glow plug options (I usually add some castor to a commercial fuel but I wouldn't do own mix)
- Throttle range (I prefer to land with idling engine, not deadstick [X(] )
- Parts availability
Thanks
The OP'er
To narrow it down and be more specific I don't intend to race, just to smoke the 55AX guys
and still have control of the thing. So how would you rate the mentioned engines (Webra/Weston, Jett, Rossi, ASP/Magnum, OS SX, OS Heli) on:- User friendliness (break-in, tuning)
- Fuel and glow plug options (I usually add some castor to a commercial fuel but I wouldn't do own mix)
- Throttle range (I prefer to land with idling engine, not deadstick [X(] )
- Parts availability
Thanks
The OP'er
11-12-2010, 02:10 AM
#72
Senior Member
RE: Which fast .50 2-stroke for Nemesis?
The Jett, Weston and Rossi are obviously great choices. I have owned a rossi .53 and I do own two ASP/Magnum XLS .52. If you want to spend some money, one of the first three will be great, if you want speed and money left, go for theASP/Magnum XLS .52. The ASP/Magnum is very very powerful when fitted with the right exhaust (Tower muffler or pipe) I have run mine up as high as 19300 rpm on a small prop and a friend of mine lugged it down with an APC 14-6 turning around 10000 rpm on a pipe and long header, it worked great in a 40 sized profile.
Point is, with the right exhaust configuration that engine can do anything
Point is, with the right exhaust configuration that engine can do anything
11-12-2010, 08:51 AM
#73
Senior Member
My Feedback: (14)
RE: Which fast .50 2-stroke for Nemesis?
I would buy a Jett muffler for your ASP/Magnum .52 engines, assuming that they aren't over the hill in wear. Then pray that the OS .55AX guys don't do the same. Also, if you are not limited in nitromethane percentage in your fuel, you might try lifting the cylinder head a tad and cranking up the nitromethane.
The OS .55AX has you beaten when it comes to swinging large props, but you are racing, which means that you need to let the engine rev up with a small prop. I'm not certain that the OS .55AX will have the advantage in that case. I own both engines, actually, and I own the Webra .50 GT too.
I wish I could get to the test bench and run all three to see what they will do. I also have the Jett high performance standard looking muffler(s) too. Danged business inventory (in the way)!
Ed Cregger
The OS .55AX has you beaten when it comes to swinging large props, but you are racing, which means that you need to let the engine rev up with a small prop. I'm not certain that the OS .55AX will have the advantage in that case. I own both engines, actually, and I own the Webra .50 GT too.
I wish I could get to the test bench and run all three to see what they will do. I also have the Jett high performance standard looking muffler(s) too. Danged business inventory (in the way)!
Ed Cregger
11-13-2010, 11:45 PM
#74
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RE: Which fast .50 2-stroke for Nemesis?
ORIGINAL: earlwb
Everyone had a prop pitch gauge to double cheak the pitch, plus it let you try different profiles. Anything so you could beat the other guy by a nose.
One problem with the props is they vary in pitch from prop to prop or even production runs. So you needed to carefully check all your props and match them up as close as possible.
here is one example: http://www.mh-aerotools.de/airfoils/propgeo5.htm
or
http://winshiprc.tripod.com/propeller_page.htm
or
http://www.mh-aerotools.de/airfoils/pylonprops_2.htm
The Prather Pitch gauge is usually the one most guys use in the USA.
http://www.quicktechhobby.com/Airpla...r_products.htm
Everyone had a prop pitch gauge to double cheak the pitch, plus it let you try different profiles. Anything so you could beat the other guy by a nose.
One problem with the props is they vary in pitch from prop to prop or even production runs. So you needed to carefully check all your props and match them up as close as possible.
here is one example: http://www.mh-aerotools.de/airfoils/propgeo5.htm
or
http://winshiprc.tripod.com/propeller_page.htm
or
http://www.mh-aerotools.de/airfoils/pylonprops_2.htm
The Prather Pitch gauge is usually the one most guys use in the USA.
http://www.quicktechhobby.com/Airpla...r_products.htm
Hyperformance Products, Inc. acquired Prather Products, Inc. on May 1, of 2007 and now mostly deal in RC boat related goods now.
I think it is doubtful you would see the gauge if you ordered it from Quicktechhobby if what is said here is true:
http://www.rcuniverse.com/forum/fb.asp?m=6468677 So be warned. Nuf said.
06-25-2011, 06:02 AM
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RE: Which fast .50 2-stroke for Nemesis?
Hi Earl,
I recently picked up a Fox Hawk that seems to have very very little run time or not at all, but it was out of the box. Its in great condition with like-new compression, smooth bearings, and red anodize. I never had one before but wanted one which is why I'm about to ask a question. This hawk has the chromed butterfly carb, back plate, and muffler but the crankcase was left raw with no finish. I searched this thread and found this old post of yours with your pictures and seems like 1 or 2 of your engines are the same way. I can't tell for sure about the 3rd engine in your pic. At first I thought mine was restored from another hawk that was chromed but maybe Fox made it this way. Are you able to shed some light on this? I have an old Sig catalog from about '79 that has the Fox full color catalog in it. In the catalog it shows a hawk with what appears to be a chromed case. Maybe that was done just for the catalog pic. Just wondering if there's any significance to it.
Thanks,
carddfann
I recently picked up a Fox Hawk that seems to have very very little run time or not at all, but it was out of the box. Its in great condition with like-new compression, smooth bearings, and red anodize. I never had one before but wanted one which is why I'm about to ask a question. This hawk has the chromed butterfly carb, back plate, and muffler but the crankcase was left raw with no finish. I searched this thread and found this old post of yours with your pictures and seems like 1 or 2 of your engines are the same way. I can't tell for sure about the 3rd engine in your pic. At first I thought mine was restored from another hawk that was chromed but maybe Fox made it this way. Are you able to shed some light on this? I have an old Sig catalog from about '79 that has the Fox full color catalog in it. In the catalog it shows a hawk with what appears to be a chromed case. Maybe that was done just for the catalog pic. Just wondering if there's any significance to it.
Thanks,
carddfann
