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

new demon to fly soon!!!

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Old 12-10-2007, 08:42 PM
  #1  
randy racer
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Default new demon to fly soon!!!

i'm getting close to having my new screamin demon ready to fly. for now i will be installing a thunder tiger 39 heli engine i have so i can fly it but my plans are to install a JETT 60LX after the first of the year for a lot more speed. thanks mike conners for a nice kit and tim g for doing most of the building. i will give a flight report as soon as i can

randy racer
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Old 12-10-2007, 10:01 PM
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Default RE: new demon to fly soon!!!

rr, lookin' good! It would be interesting to see clockings between the 2 different engines on the same plane.
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Old 12-10-2007, 10:39 PM
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randy racer
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Default RE: new demon to fly soon!!!

i may have run into a problem installing the 39 heli, the engine mount is narrow and almost falls through the rails on the airframe. i don't know how to fix it so installing a 40 size engine latter won't a problem. i may just wait till i can get the jett.

rr
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Old 12-11-2007, 12:28 AM
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Default RE: new demon to fly soon!!!

I would take the plans down to Kinkos and get them reduced to 85-90% and build a little brother to the full size plane for your heli engine.
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Old 12-11-2007, 06:58 AM
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randy racer
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Default RE: new demon to fly soon!!!

that sounds like a good idea but i have a place for the heli engine i just need to get through the holidays before buying a jett 60 LX. it won't be easy waiting for the engine, i want to see this thing fly bad.

rr
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Old 12-11-2007, 09:28 AM
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Default RE: new demon to fly soon!!!

See if you can buy/borrow/trade/aquire a Thunder Tiger .40/.46 or something similar. Inexpensive and they run well. Fly it with that to start with.

Resulting mounting holes will be the same as will be used for the Jett.

The TT-39 engine has the OS .32 mounting bolt pattern. If you want to go that route, you may wish to make a u-shaped adapter plate that fits on top of the stock engine mount - perhaps from 1/8 AL or 1/8" ply --- mount the engine to that, and then bolt that entire plate into the front of the plane. Might serve as a break-way plate if things get a bit rought along the way.
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Old 12-11-2007, 09:31 AM
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Mike Connor
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Default RE: new demon to fly soon!!!


ORIGINAL: randy racer

i may have run into a problem installing the 39 heli, the engine mount is narrow and almost falls through the rails on the airframe. i don't know how to fix it so installing a 40 size engine latter won't a problem. i may just wait till i can get the jett.

rr
The engine mount width is shipped setup for a .25 and it is cut out by the builder for a larger engine. Did Tim Cut it out for a 40 size? I am looking forward to a flight report.

Tulsa is all but shut down from a ice storm and my house is without power. It may be awhile before I post again.
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Old 12-11-2007, 09:35 AM
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Default RE: new demon to fly soon!!!

Hang in there mike......

try and stay warm !
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Old 12-11-2007, 09:51 AM
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Mike Connor
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Default RE: new demon to fly soon!!!

ORIGINAL: bob27s

Hang in there mike......

try and stay warm !
Thanks Bob, I have gas heat and water so I am good there but it gets dark with candles only. Almost every tree in Tulsa has serious damage with limbs every where. It may be days before my house gets power back.

I agree the TT Pro 46 would be a great choice for the Demon. The speed will surprise you.

Randy, I like your decals. Did you print your own?
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Old 12-11-2007, 12:05 PM
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Default RE: new demon to fly soon!!!

Looks good hope the maiden goes well its a good flyer
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Old 12-11-2007, 04:20 PM
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Default RE: new demon to fly soon!!!

yes tim and i cut out the engine mount for his OS 46 fx.
mike hope the weather gets better for you soon.
i hate to throw $ at a 46 when a Jett is what i want but i may not be able to wait[]

my brother has a cutter and makes all of my decals. if you need some call him at Beasely's tv and satalite 270-759-0901 ask for chad and tell him his big brother sent you. he does the signs and decals on the side for Beasley's

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Old 12-11-2007, 07:28 PM
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Mike Connor
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Default RE: new demon to fly soon!!!


ORIGINAL: randy racer

yes tim and i cut out the engine mount for his OS 46 fx.
mike hope the weather gets better for you soon.
i hate to throw $ at a 46 when a Jett is what i want but i may not be able to wait[]

my brother has a cutter and makes all of my decals. if you need some call him at Beasely's tv and satalite 270-759-0901 ask for chad and tell him his big brother sent you. he does the signs and decals on the side for Beasley's

randy
The TT 46 is a good engine but it does not compare to a Jett. If you are going to get one anyway it may be time. My SJ 50 on a light Delta was just too cool. Your engine mount is good for the Jett if you cut it out for a 46 fx.

Does your brother cut decals for kit distributers?
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Old 12-11-2007, 09:33 PM
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Default RE: new demon to fly soon!!!

"Does your brother cut decals for kit distributers?"

hey mike let me know what you want and i will get you a price. just drop me a pm or email

randt
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Old 12-29-2007, 08:25 AM
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Default RE: new demon to fly soon!!!

i ran into what i hope was a deal on a YS 45 yesterday and i bought it(100.00 new in box). have any of you guys ran the ys engines and have any pointers i may need to know? it's a side exhaust and i ordered a macs header for it and i plan to build a mousse can pipe for it for now. i hope this will make the screamin demon go till i can get a Jett.

rr
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Old 12-29-2007, 02:10 PM
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Default RE: new demon to fly soon!!!

I have not owned one but I keep hearing good things about the YS 45. You may be close to Jett performance at a fraction of the cost. There are a few reviews on that engine here on RCU that may be of some interest.
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Old 03-02-2008, 03:50 PM
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Default RE: new demon to fly soon!!!

FINALLY!!!!! the deman flew today! the YS 45 ran good on the mac's header and pipe (not great yet) still needs to be tuned. i don't know what speed i got but i left a bunch on the table still. running 30% nitro and a 9-9 APC prop i only turned 14700 rpm on the ground. the engine has only had two tanks ran through her on the ground and three in the air so it will get better i hope.

does anyone know what this engine will like aqs far as props, fuel, and header length?

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Old 03-02-2008, 05:03 PM
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Default RE: new demon to fly soon!!!

I just bought a YS 45fr and have neen researching it for a few days. The hottest setup i have heard about is the macs header and #1349 marine muffled pipe on 30%. He got 17,400 on an APC 9x9. Pipe length from glow plug to large apex on pipe 11 5/8 in.
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Old 03-02-2008, 09:16 PM
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Default RE: new demon to fly soon!!!

This length is the "stretched/strait" length or true distance from glow plug to apex. It will appear shorter if you have a riser / doglegged header. A good engine brocken-in & good bearings should see a minimum of 16,300 on 15% nitro with an APC 9X9 and a good tuned pipe, this is my benchmark. On 30% expect about 800 more. With a Marine (nitro) pipe I have seen 17400+. These are peaked numbers back off a bit rich for flight. If it lugs/sags in the air and theres no smoke land and richen. In all cases it should unload a bunch in the air, this is what realy counts, right? This engine is finicky about glow plugs and realy likes OS #8s. Here are pics of cut & uncut headers, about 2 1/2" removed, but work up your own length / tunning. I use a mini tubing cutter and deburr the i.d., make sure the chips don't get in the engine. If you used the full length header it will pull a good size prop at lower RPM's but it will be sad for speed.
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Old 03-02-2008, 09:24 PM
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Default RE: new demon to fly soon!!!


ORIGINAL: randy racer

the engine has only had two tanks ran through her on the ground.

randy
Randy, how did you break it in?
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Old 03-02-2008, 11:32 PM
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Default RE: new demon to fly soon!!!

for the break in i ran it rich at full throttle just leaning it out for a few seconds then going back to very rich. i also kept it rich in the air for the first three flights. i will cut the header down a little more before i fly it again. i ran OS #5 plugs and burnt two so i may need to try the #8.
i was very happy with the first flights but adjustments will need to be made. i think i was a little nose heavy due to needing a lot of up trim. on take off is it normal for the plane to try to roll to the left? it's better with less power on and smooths out once the speed is up.

rr
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Old 03-10-2008, 06:42 AM
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Default RE: new demon to fly soon!!!

i didn't have much time but i did get three more flights on the deamon yesterday. i added 3/4 oz more weight to the tail and cut a little more off of the pipe last week so i needed to try it out. the rpm's came up to 16250 from 14700 so i still need more pipe work. looks like i will get around 3.5 minutes of flight on a 6 oz tank running 30%. this little plane flys like it's on rails as they say but still gets the old heart pumping hard. haha! we also had a radar gun at the field and clocked it at 140mph but i'm still hoping for much more. how much more speed do you guys think 2000 more rpm will give me with a 9 pitch prop? also would ther be a better/faster prop choise, say like a 8-10?


rr
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Old 03-10-2008, 10:27 AM
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Default RE: new demon to fly soon!!!


ORIGINAL: randy racer

how much more speed do you guys think 2000 more rpm will give me with a 9 pitch prop? also would ther be a better/faster prop choise, say like a 8-10?


rr
I am thinking that with the right prop and the pipe set right you should see 160-170 mph. Maybe a 9x10 cut down a little or one of the pylon props would work. A 9x9 has 50% more prop load then a 8x10 so the 8x10 may be too light for the engine. Would be interesting but your pipe may have to be real short. In theory each additional 1000 rpm would add just under 10 mph to the speed using a 9 pitch prop.

Did you take any pictures with the engine on the airframe? I would like to update my testimonial page. Thanks
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Old 03-10-2008, 03:16 PM
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Default RE: new demon to fly soon!!!

thanks mike, i will try to post some pics tonight. it is a sweet flying plane and with a few more adjustments it should be fast too.[sm=lol.gif]

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Old 03-10-2008, 08:32 PM
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Default RE: new demon to fly soon!!!

ok here is a few pics with engine installed.

rr
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Old 04-03-2008, 08:29 PM
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Default RE: new demon to fly soon!!!

here is a link to a video tim g shot of my demon http://www.rcuvideos.com/item/X0JGD2MJRZ053LK3

still working on the set up but i love this little rocket. hey mike how fast is it so far?

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