Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

small racer? need help

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Old 12-29-2005, 01:22 PM
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G.W.
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Old 12-29-2005, 02:13 PM
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Default RE: small racer? need help

Well, there are people on here that have shoe horned Jett 50's in them so the for should be no problem...
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Old 12-29-2005, 02:19 PM
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Default RE: small racer? need help

Too Small?

I just made an aluminum engine mount for my Jett .50!
Next is to add a doubler to the back side of the firewall & 6-32 blindnuts.
8 oz Jett bubbless tank is on order
As well as some digital thin wing servos for flapperons use.

The Fin will get the rudder cut out and set up.
I have a feeling that Right Rudder on takeoff will be a must!

What OLD OS .40 do you have? I don't think you will get much more than 15,500 RPM
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Old 12-29-2005, 02:39 PM
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Old 12-29-2005, 06:29 PM
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Default RE: small racer? need help

Coffeeg, don't count out the LR-1. Its a very nice airframe for the 40.

I've ripped out the landing gear twice on my electric version and was easily able to repair the damage to the wings (fiberglass over balsa skins). Its a pretty sturdy airframe.

On my Jett 50 powered LR-1, one take off was botched because I came up on the power too slowly and the torque yawed it 180ΒΊ, I killed the engine and flipped the plane over in the grass, no damage at all, restarted and went flying.

Oh Crazy4, right rudder on take off is not needed if you line up the plane about 90ΒΊ to the right of the intended take off path, then by the time you're at full throtle, the plane is pointing in the right direction. If you have a helper to hold the plane while you spin up to full throttle, then it doesn't matter as it will take off in about 2 feet after the release!

I think the LR-1 is a very good flying plane.
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Old 12-29-2005, 08:17 PM
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Old 12-29-2005, 11:36 PM
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Default RE: small racer? need help


Ah tadpole: Sit back and listen to the words of wisdom your sense is trying to impart on your blockhead brain.

You have a lot of years of good experienced people here trying to help you, and you are just not listening. The LR-1 is a great cost effective airframe, the OS (eggggg) 40 will fit in with no real proplem. Put a Jett or Performance specialities muffler on it and the combo will scoot. I suspect not for a long time, but these things tend to have short life spans. Matney models also make a few 15 size formula type airframes at very reasonable prices. Now that you are blessed with these and other words of wisdom, get the heck to work and try it. You can always buy a real motor in the future.
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Old 12-29-2005, 11:44 PM
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Default RE: small racer? need help

you might look at the 1/12 combat ARFs from tower/GreifPlanes. wings may be a bit thick for any kind of real speed
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Old 12-30-2005, 06:56 AM
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Default RE: small racer? need help

Oh Crazy4, right rudder on take off is not needed if you line up the plane about 90ΒΊ to the right of the intended take off path, then by the time you're at full throtle, the plane is pointing in the right direction.
Now there is sound advice. At the next race I go to I will launch my racer along the start line instead of at the #1 Pylon. I think though, that in the interests of safety and common sense I will fit and use a Rudder.

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Old 12-30-2005, 11:34 AM
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Old 12-30-2005, 12:17 PM
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Default RE: small racer? need help

Anyway this is off the subject, but has anyone seen a 40 size boat engine run on an airplane? That thing was turning 26,674rpm
Ah no doubt. But when you put a boat engine on an airplane you have to put an airplane prop on the engine.

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Old 12-30-2005, 12:56 PM
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Default RE: small racer? need help

Picco .40 RIRE Marine, ported & polished with a Nelson pipe ... 27,000 on an F3D prop. Heavy. Indestructible.

Jetts are not overpriced. You're buying twice the precision and twice the service life. O.S.'s cost the same per kilowatt-hour, but you need to buy two.

Duane Gall
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Old 12-30-2005, 02:19 PM
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Default RE: small racer? need help


ORIGINAL: DHG

Jetts are not overpriced. You're buying twice the precision and twice the service life. O.S.'s cost the same per kilowatt-hour, but you need to buy two.

Duane Gall
RCPRO
You can send your money to Japan or China if you like or spend it here.

I just ordered a FIRE .60LX from Dub, I know the QUALITY I am buying. I have bought several used Jett engines in the past and they are all still flying strong. My first K&B .40 has long since been worn out as well as several OS.46FX. The .46FX was a great sport motor easy start ran well easy to tune but pipe it and prop it for max speed and they just don't last.

Bob
Jett sport 50 UK Magnum
Jett sport 50 ACM Whiplash
Jett FIRE 50 ACM Whiplash
Jett SS.40 SIG Kobra
Jett 1.20 G.P. F-4
Jett sport 50 being fitted to a Wild Hare LR_1
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Old 12-30-2005, 10:08 PM
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Default RE: small racer? need help

Wow Ed S, you must not have much common sense if you actually even thought about lauching down the start line at your next race!.

I never mentioned anything about racing. I was just describing how the plane would react to the engine spooling up.

And Yes, I have lauched down the start line, except there was no one there, then the plane torques to the left and it's lined up nicely with the runway. I've launched straight ahead also, even downwind.

I did cut the rudder free on my LR-1 and it works fine to keep the plane tracking straight down the runway. There is more than one way to get a plane into the air.

I would hope that people playing with speed planes have at least a little common sense to know when, where, and how to do certain things.
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Old 12-30-2005, 11:12 PM
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Default RE: small racer? need help

Are you very comfortable flying at over 100mph 5ft off the ground?
We all have to slow down to land.[8D]
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Old 12-30-2005, 11:27 PM
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Default RE: small racer? need help

[quote]ORIGINAL: coffeegrinder

rmenke,

What is YOUR definition of a REAL engine, some engine, Jett for example, which don't run as nice reliability wise as any OS




Sorry mate, but you got the "OS and the "Jett" bit back to front...

and lets not even mention the fact that you need to mill, port and polish??? etc the OS, that sort of summed it up( I'm surprised you didnt throw in terms like" blueprint" or "flowbench")
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Old 12-30-2005, 11:52 PM
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Default RE: small racer? need help

ORIGINAL: Airbike-RCU

Wow Ed S, you must not have much common sense if you actually even thought about lauching down the start line at your next race!.

I never mentioned anything about racing. I was just describing how the plane would react to the engine spooling up.

And Yes, I have lauched down the start line, except there was no one there, then the plane torques to the left and it's lined up nicely with the runway. I've launched straight ahead also, even downwind.

I did cut the rudder free on my LR-1 and it works fine to keep the plane tracking straight down the runway. There is more than one way to get a plane into the air.

I would hope that people playing with speed planes have at least a little common sense to know when, where, and how to do certain things.

Well I use right rudder too to go straight down the runway and while climbing out.
The left turn is a result of P-factor, reactionary torque and gyroscopic precession.

Add a tail wheel and taxi out to take off and taxi back.

AMA requires rudder on the pylon planes. so you dont have to align yor plane with the start line.[8D]

Why I will put a rudder on my LR-1......

I once watched a maiden flight. A Q-500 type plane with out rudders a .45 Ducted Fan piped motor tuned to its prop 18,500. Pilot set the plane down 5 feet in front of him aligned straight with the runway. Full throttle take off the plane got off fast hooking left rolled on its back and and splattered into a picknic table behind the pit fence. The debris was scattered over 60 feet from point of impact! Which was 6 feet short of the hood of a new Buick. Pilot said "I was hold right aileron but it would not respond !?!"

My new mount installed with a Jett .50
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Old 12-31-2005, 02:52 AM
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Default RE: small racer? need help

Crazy4, I know you will enjoy the Jett 50 in the LR-1. Your engine install looks very clean with your custon mount.

I think that elev flutter is my biggest worry, but so far, everything is holding up, even in screaming 500' split S dives

This is a FUN combo for sure.
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Old 12-31-2005, 09:30 AM
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Default RE: small racer? need help


ORIGINAL: Airbike-RCU

Crazy4, I know you will enjoy the Jett 50 in the LR-1. Your engine install looks very clean with your custon mount.

I think that elev flutter is my biggest worry, but so far, everything is holding up, even in screaming 500' split S dives

This is a FUN combo for sure.
What seorvs are in your wing? Me thinks Hitek HS-225 or HS-5125 digitals yes I plan on flaperons. Also have been reshaping the LE and TE of the landing gear.

I have the HS-225 in a Kangke F3D with OS.32SX + mac muffler.

And I order a JettStream muffler for it, from Dub, the other day.
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Old 12-31-2005, 12:36 PM
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Default RE: small racer? need help

I am using HS-85MG all around except for HS-81 on throttle. Since the control surfaces don't need much throw, I thought that if I kept the servo arm short and used the outside hole on the control horns, that should be enough torque. I know the HS-225 might be a better choice but the 85's are holding up.

I had to order a 1/2" muffler extension to clear the fuse with the black race muffler.
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Old 12-31-2005, 01:31 PM
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Default RE: small racer? need help

can you post a picture of wing servo mounts?
I can make any length muffler extention needed.
I think my macs quiet pipe would be draggin
but the RAT pipe is way too loud for the club I fly at
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Old 01-02-2006, 12:49 AM
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Default RE: small racer? need help

What wing servo mounts? If I recall, I wrapped the servo with some tape and then epoxied them to the wing skin, then screwed the servo covers in place. I did put the Rx batt, rud & elev servos in the tail to balance out the heavier engine in the nose.
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Old 01-02-2006, 09:24 PM
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Default RE: small racer? need help

Posts deleted because I come to rcu to ask a simple question "Does anyone know of a small racer that would be overpowered with an old OS 40 besides the Wildhare LR-1?" and all I get is degraded with the old engine that was from my trainer many years ago that I just wanted to use for FUN! Then I get people telling me "oh get the lr-1 it's blah blah blah blah". If people would just answer the apparant "difficult" questions asked on forums RCU would be a lot better place![:'(]
Good Day!
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Old 01-02-2006, 10:31 PM
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Default RE: small racer? need help

Maybe a padded helmet.
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Old 01-02-2006, 11:55 PM
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ORIGINAL: HighPlains

Maybe a padded helmet.
Now that is funny
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