Shrike 40 with thinner airfoil
02-19-2013, 06:37 PM
#177
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RE: Shrike 40 with thinner airfoil
Yes I did. My last Shrike with same engine required 2.5 ozs. of lead in the tail. Actually I just did some simple math to get my nose moment. I laid out my radio components on the airframe and it looks to be spot on. The K/B 6.5 is a very light engine and I can't see how some are installing 60's without shortening the nose moment. I would like to build one around the JETT 60 LX but that is more $$$$$$. If I would go that route I would switch to a SD delta if MJD would ever make some kits! Lots more potential for speed with the SD.
02-19-2013, 06:55 PM
#178
RE: Shrike 40 with thinner airfoil
I think you can hit 170+ with the K&B.
My first K&B 6.5 was bought unused from a F1 pylon guy. I tried it with a tuned pipe, but it ran better with open header. It liked 7.2x8.6 APCs...it liked them so well that I never bothered looking for other props.
I don't know the history of this engine, but they are a great value compared to paying a high price for newer engines with less potential to be fast.
I remember taking so much weight out of the piston and rod that I had to remove some weight from the counterweight because of vibration. I just ground a half round 1/8" divit and on the first try the engine smoothed right out.
My first K&B 6.5 was bought unused from a F1 pylon guy. I tried it with a tuned pipe, but it ran better with open header. It liked 7.2x8.6 APCs...it liked them so well that I never bothered looking for other props.
I don't know the history of this engine, but they are a great value compared to paying a high price for newer engines with less potential to be fast.
I remember taking so much weight out of the piston and rod that I had to remove some weight from the counterweight because of vibration. I just ground a half round 1/8" divit and on the first try the engine smoothed right out.
02-19-2013, 07:09 PM
#179
Join Date: Dec 2002
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RE: Shrike 40 with thinner airfoil
That's one way to get rid of ballast: grind away at the piston and rod until the engine starts shaking your plane apart....then start grinding on the crank counterweight until it smoothes out again.
Then take some ballast out of the tail.
Heck, you win 3 times!
I love it
Then take some ballast out of the tail.
Heck, you win 3 times!
I love it
02-19-2013, 08:50 PM
#180
RE: Shrike 40 with thinner airfoil
A machinist like Speedy would cringe to see the "milling" of the piston done "freehand"....
Remember to wind lots of duct tape around the piston before grinding away. I just pretend to be a dentist when doing that stuff..a very patient dentist with a fine tooth rotary file in a high speed die grinder. A flex shaft between the die grinder and the cutting tool would make that sort of work much easier, I'll bet.
Micro grams add up when a piston is going up and down 300-400 times per second.
Less weight takes a load off the crank pin. It's a pretty easy way to make a little bit of difference.
The other thing that would help is a hollow wrist pin...I can't remember if this engine has one or not.
Remember to wind lots of duct tape around the piston before grinding away. I just pretend to be a dentist when doing that stuff..a very patient dentist with a fine tooth rotary file in a high speed die grinder. A flex shaft between the die grinder and the cutting tool would make that sort of work much easier, I'll bet.
Micro grams add up when a piston is going up and down 300-400 times per second.
Less weight takes a load off the crank pin. It's a pretty easy way to make a little bit of difference.
The other thing that would help is a hollow wrist pin...I can't remember if this engine has one or not.
02-20-2013, 01:44 PM
#182
My Feedback: (202)
RE: Shrike 40 with thinner airfoil
ORIGINAL: combatpigg
A machinist like Speedy would cringe to see the ''milling'' of the piston done ''freehand''....
Remember to wind lots of duct tape around the piston before grinding away. I just pretend to be a dentist when doing that stuff..a very patient dentist with a fine tooth rotary file in a high speed die grinder. A flex shaft between the die grinder and the cutting tool would make that sort of work much easier, I'll bet.
Micro grams add up when a piston is going up and down 300-400 times per second.
Less weight takes a load off the crank pin. It's a pretty easy way to make a little bit of difference.
The other thing that would help is a hollow wrist pin...I can't remember if this engine has one or not.
A machinist like Speedy would cringe to see the ''milling'' of the piston done ''freehand''....
Remember to wind lots of duct tape around the piston before grinding away. I just pretend to be a dentist when doing that stuff..a very patient dentist with a fine tooth rotary file in a high speed die grinder. A flex shaft between the die grinder and the cutting tool would make that sort of work much easier, I'll bet.
Micro grams add up when a piston is going up and down 300-400 times per second.
Less weight takes a load off the crank pin. It's a pretty easy way to make a little bit of difference.
The other thing that would help is a hollow wrist pin...I can't remember if this engine has one or not.
02-21-2013, 05:24 PM
#183
My Feedback: (202)
RE: Shrike 40 with thinner airfoil
I have modded several K/B metrics and have found them to be excellent runners in their stock form.
I have also used the marine outboard high port sleeves in the 7.5's with great results. The K/B "Metrics"
were great little engines but the consistency of manufacture left a lot to be desired. Some were good and others
were lemons. Most made Clarence Lee to be an engine genius but in reality he was/is just a guy that new right
from wrong when opening up an engine. When K/B came out with the SR II 6.5cc "Quickee" they had a real winner but
the rules were changed to only allow side exhaust engines for Q500 so the K/B SR II 6.5cc Quickee lived a short life in the
spotlight.
I have actually found that the K/B SR II 6.5 will easily hold it's ground to a K/B 7.5 DF. Either way I buy them up whenever
available at a reasonable price because they are worth every dollar spent and I love placing fear in the "Big Boys"
with my cheap little K/B's!
It is getting hard to find affordable RE engines let alone RE engines period! Thus my love affair with K/B metric series engines.
SPEEDY-G
I have also used the marine outboard high port sleeves in the 7.5's with great results. The K/B "Metrics"
were great little engines but the consistency of manufacture left a lot to be desired. Some were good and others
were lemons. Most made Clarence Lee to be an engine genius but in reality he was/is just a guy that new right
from wrong when opening up an engine. When K/B came out with the SR II 6.5cc "Quickee" they had a real winner but
the rules were changed to only allow side exhaust engines for Q500 so the K/B SR II 6.5cc Quickee lived a short life in the
spotlight.
I have actually found that the K/B SR II 6.5 will easily hold it's ground to a K/B 7.5 DF. Either way I buy them up whenever
available at a reasonable price because they are worth every dollar spent and I love placing fear in the "Big Boys"
with my cheap little K/B's!
It is getting hard to find affordable RE engines let alone RE engines period! Thus my love affair with K/B metric series engines.
SPEEDY-G
02-21-2013, 08:05 PM
#184
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Location: Orangeville, ON, CANADA
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RE: Shrike 40 with thinner airfoil
I picked up two 7.5 RE DF engines off the classifieds a couple of years ago. I haven't run them yet 
.. need to order headers, no other excuse. I'll get to it, for now they're in the drawer ready for spring and the test stand at least. One has the billet front end and rear drum housing, the other cast parts. I'm sure one will end up on a Demon sometime soon. While there are engines like the OS .46 VR-DF with more power, I really like the form factor - they are narrow and compact for their displacement. Molding a dedicated fuselage profile around one with the right wing would make for a respectable sport speed design. I had a Matney AJ-2 Quarter Midget .15 kit in the shop for a while (traded it, but I sure wanted to get it done) and I used to hold the 7.5's against the fuselage to visualize the mutation.. I was sure it would work at the time. They have 350 sq in of wing so why not.
.. need to order headers, no other excuse. I'll get to it, for now they're in the drawer ready for spring and the test stand at least. One has the billet front end and rear drum housing, the other cast parts. I'm sure one will end up on a Demon sometime soon. While there are engines like the OS .46 VR-DF with more power, I really like the form factor - they are narrow and compact for their displacement. Molding a dedicated fuselage profile around one with the right wing would make for a respectable sport speed design. I had a Matney AJ-2 Quarter Midget .15 kit in the shop for a while (traded it, but I sure wanted to get it done) and I used to hold the 7.5's against the fuselage to visualize the mutation.. I was sure it would work at the time. They have 350 sq in of wing so why not.
04-03-2013, 05:06 PM
#185
My Feedback: (202)
RE: Shrike 40 with thinner airfoil
Never say "Never"! I am applying silk and dope as of this evening. Should have it covered this week.
No paint.....just covered.
Going to the TOLEDO R/C Expo on Saturday. There goes another paycheck!!
TOLEDO has been a yearly tradition for my dad and I for the last 35 years.
We go mainly for the day together and I buy glowfuel without paying hazmat fees and batteries.
No paint.....just covered.
Going to the TOLEDO R/C Expo on Saturday. There goes another paycheck!!
TOLEDO has been a yearly tradition for my dad and I for the last 35 years.
We go mainly for the day together and I buy glowfuel without paying hazmat fees and batteries.
05-24-2013, 06:11 PM
#188
My Feedback: (202)
RE: Shrike 40 with thinner airfoil
Thanks so much for your sincerity CBP.
Sometimes life is beyond our control and that sucks.
I am fortunate to have so many memories with my Dad.
He is a hard ass Marine and a Korean War Veteran so he knows how to fight.
This will be the battle of his life and I am willing to put my life on hold to stand by his side.
I will still find time to go flying with what I have ready to go but building is on "hold".
Thanks once again.
Dennis L. Wann ( aka "Speedy-Gonzales" )
Sometimes life is beyond our control and that sucks.
I am fortunate to have so many memories with my Dad.
He is a hard ass Marine and a Korean War Veteran so he knows how to fight.
This will be the battle of his life and I am willing to put my life on hold to stand by his side.
I will still find time to go flying with what I have ready to go but building is on "hold".
Thanks once again.
Dennis L. Wann ( aka "Speedy-Gonzales" )
05-25-2013, 12:22 PM
#190
My Feedback: (202)
RE: Shrike 40 with thinner airfoil
Iron Eagle,
Thank you. Father/Son teams in modeling are becoming uncommon.
I have been blessed. Not only are we a team in modeling but also in fishing, drag racing, hunting.
We have much to sit and remember together. Many stories to tell and share and laugh about. Most good.
Give your fathers a hug every chance you get while they are alive and never be afraid to tell someone you love them.
As a man.....NEVER feel weak by showing emotion. Emotion comes from the heart and soul.
I am not looking for sympathy but I do sincerely appreciate all your well wishes.
Thanks again!
SPEEDY-G
Thank you. Father/Son teams in modeling are becoming uncommon.
I have been blessed. Not only are we a team in modeling but also in fishing, drag racing, hunting.
We have much to sit and remember together. Many stories to tell and share and laugh about. Most good.
Give your fathers a hug every chance you get while they are alive and never be afraid to tell someone you love them.
As a man.....NEVER feel weak by showing emotion. Emotion comes from the heart and soul.
I am not looking for sympathy but I do sincerely appreciate all your well wishes.
Thanks again!
SPEEDY-G
11-04-2014, 06:50 PM
#191
My Feedback: (202)
Well guys......It's been a long year and much has happened since my last post but here are 3 pics for you to flip your carrot over!
My new modified "SHRIKE" is just about ready for radio install. The silk and dope covering with urethane primer and paint came out real nice.
Not perfect but nice. All the mods to the airframe are listed in previous posts. Looks like this new version will come out at just under 4 pounds RTF.
BTW... my Dad is doing well but contained to a care facility. That is the polite way of saying a nursing home. We won't go in that direction tonight.
This post is to show that my love of speed and this great hobby is still alive despite what life can throw at me.
Enjoy the pics!!! Speedy-Gonzales.
My new modified "SHRIKE" is just about ready for radio install. The silk and dope covering with urethane primer and paint came out real nice.
Not perfect but nice. All the mods to the airframe are listed in previous posts. Looks like this new version will come out at just under 4 pounds RTF.
BTW... my Dad is doing well but contained to a care facility. That is the polite way of saying a nursing home. We won't go in that direction tonight.
This post is to show that my love of speed and this great hobby is still alive despite what life can throw at me.
Enjoy the pics!!! Speedy-Gonzales.
11-09-2014, 08:21 AM
#197
Anyone have a suggested electric setup for this plane? It wouldn't HAVE to be the fastest ever.. as that would only lead to its demise with me flying ! hahahah But I wondered if someone had built one that flew well on a budget?
11-09-2014, 11:04 AM
#198
Join Date: Dec 2002
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Look into the electric helicopter motors...they are well suited for high rpm/speed applications.
I've got a 2kW+ setup in a MPX Dogfighter with a 500 size heli motor on 5S...ballistic...
I've got a 2kW+ setup in a MPX Dogfighter with a 500 size heli motor on 5S...ballistic...
Last edited by Rudeboy; 11-09-2014 at 11:06 AM.