Sunday noon Revver sounds
01-14-2007, 08:42 AM
#1
Thread Starter
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,607
Likes: 0
Received 13 Likes
on
11 Posts
Sunday noon Revver sounds
Here's what the neighbours of a speed freak have to put up with on a beautiful sunday noon...
I have been messing around with a little MVVS 15 the past few weeks, to see how far I can push it. Below are a couple of small video files so you can hear the progress. I'm now up to 26.3K peak, and about 25.8K flight setting. Finding peak means blowing a plug as it is now. It's still easy on plugs though if I keep it on the rich side. Perhaps a colder plug might last a wee bit longer, but small engines don't like cold plugs.
Anyway, I feel there's still a bit more in it, so I'm going to fiddle around with it a little more.
http://users.pandora.be/my_rc_world/IMAG0010.ASF
http://users.pandora.be/my_rc_world/IMAG0049.ASF
http://users.pandora.be/my_rc_world/IMAG0050.ASF
Sounds quite healthy, doesn't it.
I have been messing around with a little MVVS 15 the past few weeks, to see how far I can push it. Below are a couple of small video files so you can hear the progress. I'm now up to 26.3K peak, and about 25.8K flight setting. Finding peak means blowing a plug as it is now. It's still easy on plugs though if I keep it on the rich side. Perhaps a colder plug might last a wee bit longer, but small engines don't like cold plugs.
Anyway, I feel there's still a bit more in it, so I'm going to fiddle around with it a little more.
http://users.pandora.be/my_rc_world/IMAG0010.ASF
http://users.pandora.be/my_rc_world/IMAG0049.ASF
http://users.pandora.be/my_rc_world/IMAG0050.ASF
Sounds quite healthy, doesn't it.
01-14-2007, 10:42 AM
#3
Senior Member
Join Date: Oct 2006
Location: Düren, GERMANY
Posts: 296
Likes: 0
Received 0 Likes
on
0 Posts
RE: Sunday noon Revver sounds
Hello Rudeboy,
that’s a nice performance for this cheapy MVVS engine. Do you run a prop size of 5.5x5.5? If so, these are very good rpms numbers. I guess you have changed the timings, the venturi bore diameter and increased compression, haven’t you?
that’s a nice performance for this cheapy MVVS engine. Do you run a prop size of 5.5x5.5? If so, these are very good rpms numbers. I guess you have changed the timings, the venturi bore diameter and increased compression, haven’t you?
01-14-2007, 01:27 PM
#4
Thread Starter
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,607
Likes: 0
Received 13 Likes
on
11 Posts
RE: Sunday noon Revver sounds
Indeed, at the moment I'm running an APC 6.5x5.5 cut down to 5.5x5.5
Intake and exhaust timing, induction timing, compression, transfer channels, crank, piston, rod and venturi have been altered.
Some work on the top end may still improve things.
Ah yes, I forgot: I'm still running FAI fuel at the moment
The dog isn't ours... it belongs to the neighbours... this is my revenge
Just kidding, they are often more curious about what I'm doing than pissed off. And I don't test engines all the time.
Intake and exhaust timing, induction timing, compression, transfer channels, crank, piston, rod and venturi have been altered.
Some work on the top end may still improve things.
Ah yes, I forgot: I'm still running FAI fuel at the moment
The dog isn't ours... it belongs to the neighbours... this is my revenge
Just kidding, they are often more curious about what I'm doing than pissed off. And I don't test engines all the time.
01-14-2007, 05:02 PM
#7
RE: Sunday noon Revver sounds
Cool Rudeboy
What are your plans for this engine ? Any idea of the airframe ? Maybe a Micro Jet (http://www.modelairplanenews.com/ma/plan/microjet.asp) ?
(I have singing ears for life, take care !).
What are your plans for this engine ? Any idea of the airframe ? Maybe a Micro Jet (http://www.modelairplanenews.com/ma/plan/microjet.asp) ?
(I have singing ears for life, take care !).
01-15-2007, 10:36 AM
#9
RE: Sunday noon Revver sounds
Evan, Very nice!
My neighbor came over and told me how good my engine sounded one day even commented on how loud it was while he was in his basement. Then another one showed up with a copy of the hood restrictions listing model airplane engines[X(]. Didn't see that one when I bought in.[8D]
My neighbor came over and told me how good my engine sounded one day even commented on how loud it was while he was in his basement. Then another one showed up with a copy of the hood restrictions listing model airplane engines[X(]. Didn't see that one when I bought in.[8D]
01-15-2007, 12:35 PM
#10
RE: Sunday noon Revver sounds
ORIGINAL: vicman
Evan, Very nice!
My neighbor came over and told me how good my engine sounded one day even commented on how loud it was while he was in his basement. Then another one showed up with a copy of the hood restrictions listing model airplane engines[X(]. Didn't see that one when I bought in.[8D]
Evan, Very nice!
My neighbor came over and told me how good my engine sounded one day even commented on how loud it was while he was in his basement. Then another one showed up with a copy of the hood restrictions listing model airplane engines[X(]. Didn't see that one when I bought in.[8D]
01-15-2007, 09:18 PM
#12
Thread Starter
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,607
Likes: 0
Received 13 Likes
on
11 Posts
RE: Sunday noon Revver sounds
Evan, that looks sweet! What airframe is that? Or did you design that yourself? If so, you did a great job. I bet it moves pretty well. Do you have any idea where I can find a 1 1/4" alu spinner for this little MVVS?
Strykaas, I originally bought this engine for a 1/2A Shrike, so that's where it's going. I'll probably get a new engine, and copy the modifications when I'm done... because this one has been apart at least 20-25 times, it's a miracle it even runs at all...
Over here the village ordinances state that "testing of internal combustion engines" is prohibited all together... but I figure as long as nobody calls the cops on me, I'm free to do as I please. This is still supposed to be a free country.
Strykaas, I originally bought this engine for a 1/2A Shrike, so that's where it's going. I'll probably get a new engine, and copy the modifications when I'm done... because this one has been apart at least 20-25 times, it's a miracle it even runs at all...
Over here the village ordinances state that "testing of internal combustion engines" is prohibited all together... but I figure as long as nobody calls the cops on me, I'm free to do as I please. This is still supposed to be a free country.
01-16-2007, 01:11 PM
#13
RE: Sunday noon Revver sounds
It's a Cheetah and alot of the glider sites sell them, small, 32.75" span... This is where I got mine. Could easily be modded to gas but I've been messing more and more with electrics. I think they are the future. Just when you think there can't be anything else new a new higher C battery comes out, the latest normal packs are 25C with 40C burst!
http://www.espritmodel.com/index.asp...OD&ProdID=2179
I have had good luck with the Magnum and Tru Turn spinners, same basic turned aluminium, Magnums are much cheaper. Both should have 1.25 is a couple of shapes. 30mm is common but 1.25" is 31.75mm....
http://www.espritmodel.com/index.asp...OD&ProdID=2179
I have had good luck with the Magnum and Tru Turn spinners, same basic turned aluminium, Magnums are much cheaper. Both should have 1.25 is a couple of shapes. 30mm is common but 1.25" is 31.75mm....
