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

Ed's Mach Racer

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Old 07-30-2006, 01:47 PM
  #1  
Ed_Moorman
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Default Ed's Mach Racer

Since Hobby People had a 10 buck discount, I fished in and picked up a Mach Racer delta. I built it with the skid instead of the landing gear.

Mach Racer mods:
-Moved servos to the top so they and the control horns wouldn't drag on landing. I cut holes and added 1/16 ply underneath for servo mounts.
-Pushrods replaced with 4-40. Bolt-on ball links to the heavy duty DuBro servo arms and DuBro locking black plastic clevices. Sullivan metal control horns.
-Elevon gap taped on the bottom.
-Wing leading edge taped to prevent covering peeling back.
-JR 811 Sport digital servos used for elevons.
-Magnum .52XLS was available so that's what I used. 10-6 Master Airscrew scimitar prop for test flying. Next weekend, I'll try an APC 9-7 and 9-8. 1-% Omega fuel.
-Rossi short pipe with OS muffler adapter used. I had this in a drawer and used it. I didn't tach it, but it seemed to rev up pretty well.
-All plastic spinner replaced with a Great Planes plastic cone/metal backplate spinner. Never had one of these fail.

Flying:
-I used the same launcher as I do for my Dusty Deuce twin delta and it worked well. 2 flights and both launches were excellent.
-The plane is fast and as stable as a rock in flight. Except for it being fast, anyone who can fly a trainer could easily fly mine. No bad traits observed anywhere. Now I do use a lot of expo.
-On high rate, the rolls are a blur. Much, much too fast to attempt to count.
-Landing is easy. Deltas will slow down if you get the nose up so you can land close in easily.

It's a fun airplane.
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Old 07-30-2006, 02:51 PM
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SPEED JUNKIE
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Default RE: Ed's Mach Racer

Ed,
Looks like a nice little "Burner"[sm=thumbup.gif]
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Old 07-30-2006, 03:04 PM
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Ed_Moorman
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Default RE: Ed's Mach Racer

I have been trying to post more photos, but haven't had any luck. I have even sized them down from my usual post. I have several shots of the mods I made.

Now it seems to be working so I have uploaded some more pictures.

Nice little plane. As I said, very easy to fly.
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Old 07-31-2006, 12:32 AM
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Kmot
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Default RE: Ed's Mach Racer

I'm having the same trouble Ed. For a few days now. Tiny file size photos won't upload. I thought it was on my end. Apparently not!
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Old 07-31-2006, 11:52 AM
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Ed_Moorman
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Default RE: Ed's Mach Racer

Finally, here's a wire loop I added to pin the plane to the launcher until time to go.
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Old 07-31-2006, 09:58 PM
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Isaac F
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Default RE: Ed's Mach Racer

Looks nice.............I have a Weston 50 engine with tune pipe that get 20,000 RPMs with a 9x7 APC prop. Do you think I can put this engine to the Mach Racer? Can this airplane can handle the speed with the Weston 50?

What you think

THX

Isaac
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Old 08-01-2006, 12:29 PM
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bob27s
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Default RE: Ed's Mach Racer

Looks nice Ed...

at least the launcher will get some additional use too
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Old 08-01-2006, 09:26 PM
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Default RE: Ed's Mach Racer


ORIGINAL: Isaac F

Looks nice.............I have a Weston 50 engine with tune pipe that get 20,000 RPMs with a 9x7 APC blade. Do you think I can put this engine to the Mach Racer? Can this airplane can handle the speed with the Weston 50?

What you think

THX

Isaac
who is going to go insane on this bird??? [sm=bananahead.gif]
after telling my buddy, who was to order 3 of these, I planned to fly it with a JETT FIRE 60LX he never put in the order..... I wonder why?[sm=spinnyeyes.gif]

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Old 08-02-2006, 06:31 AM
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Ed_Moorman
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Default RE: Ed's Mach Racer

My concern with using a high speed engine like a Jett or Weston is that the plane is pretty lightly built, the elevons are built up and the kit hardware is fairly light. The elevons are also pretty wide at the root. If I were going to use a Jett or Weston engine, I would replace the elevons with solid balsa aileron stock, maybe 1 1/4 inch wide. I would also use heavy duty control hook ups as I did this time.

I also painted the inside and around the engine mount with 30-minute epoxy since I don't trust hot glue that is normally used on ARFs to hold all that long.
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Old 08-03-2006, 01:42 AM
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Flyboy Dave
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Default RE: Ed's Mach Racer

It looks good, Ed.... I'm wondering what the Magnum .52 is turning.
I have one going in a Starlight 40, with a Tower .46 muffler. The Magnum
.52 muffler ended up on my OS .40 which looks like an improvement.

It's fun to "mix and match", huh ?

FBD.
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Old 08-03-2006, 03:47 PM
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Default RE: Ed's Mach Racer


ORIGINAL: Flyboy Dave

It's fun to "mix and match", huh ?

FBD.
I wonder what Dave's Mr. Patato Head looks like....[sm=bananahead.gif][sm=RAINFRO.gif][sm=sunsmiley.gif][sm=bananahead.gif]
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Old 08-03-2006, 06:21 PM
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Ed_Moorman
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Default RE: Ed's Mach Racer

I did put a tach on the engine with an APC 9-7 prop. The engine is a couple of years old. It was cloudy and the light was fading, but the highest I got was 16,300 with other readings at 15, 800-15,900. I did not tune, I opened it some from the 10-6, cranked and it was in the 2-cycle area so I took the readings. I couldn't get a good solid reading probably due to light or it might be a battery going in the tach. It was going fast enough that I didn't want to get around in front of it. I'll check it again Saturday with good sunlight.

I'm going to order a Jett Stream muffler and also try it. Might make a good feature for the column: stock vs. Tower vs. Rossi vs. Jett on same engine. This is the same engine I ran my previous tests on using an APC 12.25-3.75 with the Mag .52XLS, OS .46AX, GMS .47, Tower .46, OS .46FX and TT .46Pro. The latter 3 were older engines. The Magnum .52 was the fastest at 12,800 on the stock muffler and 13,600 on the Tower. 10% Omega castor blend fuel. The AX was the next fastest at 12,400 & 13,100.
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Old 08-05-2006, 02:00 PM
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Default RE: Ed's Mach Racer

Ah, well, I pasted the Mach Racer. I was using an APC 9-7 and the guys claim it was definitely going faster than last weekend. I noticed it got to my turn around point quicker. Anyway, after a max rate roll and a short dive to about 30 feet, it started a slow roll and dropped the nose. I added up and the roll rate increased. This indicated one elevon is no longer working. The plane impacted a concrete runway with TOTAL destruction. Splinters and pieces of servos. All the controls were broken in the crash so I couldn't tell for sure what did happen.

I am ordering another one. I will change from the built-up elevons to solid aileron stock and maybe sweep the hinge line. Flyboy Dave mentioned a 7 degree sweep helps prevent flutter. I guess I'll get to use the Jett Stream muffler I just ordered on the new Mach Racer II.

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Old 08-05-2006, 05:49 PM
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Ken Bryant
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Default RE: Ed's Mach Racer

Heck, I want to see more of your launch system Sorry about the plane
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Old 08-06-2006, 11:42 AM
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Ed_Moorman
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Default RE: Ed's Mach Racer

The launcher is PVC and I have used it on the Dusty Deuce, twin delta (a twin Diamond Dust) and on the Mach Racer. I hold it to a Wal-Mart camp table with bungee cords. Any table with folding legs will work. A short piece of 2x2 is screwed to the rear cross member of the launcher and I drill into this for the holding pin. Nothing fancy on the pin. I have used an arrow shaft, a dowel and a screwdriver. A matching hole (Dusty Deuce) or a wire loop (Mach Racer) holds the plane to the launcher. I drilled the hole slightly slanting back just for safety.

I start and tune, then throttle back to idle. My helper and I fold the rear legs which puts the launcher at about 30 degrees depending on the table length. I rev up and when I give a nod, the helper pulls the pin. I have launched myself, but I'd rather have a helper so I can get set for action.

The launcher works a lot better than grabbing whoever is at the field and asking them for a hand launch.

The 2 top rails on the launcher were because I was worried about the plane blowing over backwards on a windy day. I tend to fly when most others will not. So far, both planes have gone like bullets so it hasn't been a problem. I removed them for the Mach Racer.

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Old 08-06-2006, 11:55 AM
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Default RE: Ed's Mach Racer

The new Mach Racer will be on order soon. Flaps and I are going to do a little re-design. I am planning to use balsa aileron stock for the elevons instead of the built up kit ones. They are 2 13/16" wide at the root and I may be getting a little flutter.

I am also planning to sweep back the trailing edge 7 degrees as Flyboy Dave has mentioned in another thread as being good to prevent flutter. A 2" extension at the tip, going to 0 at the root of the 17" elevons will give me 7 degrees. Should be an easy mod.

I am also going to titanium pushrods.

Why am I doing this? I like the little plane. Probably with the kit gear and a muffled .46 it is a great plane.
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Old 08-06-2006, 07:23 PM
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Default RE: Ed's Mach Racer

ED....my observations....

....the Mach Racer's ailerons are almost 3" wide, the ones on the massive
Delta Vortex are only 2 1/2" wide. The Mach Racers are built-up, and flimbsy,
while the Delta's are solid wood and strong. I think (hope) just downsizing
the Racer's surfaces, and making them solid wood and tapering down to about
1/8" would do the job. Also, you could shorten them up about 25% too.

Usually a flutter starts at the wingtips. On this F-20 wing I shortened the
ailerons way up to eliminate flutter. The Racer doesn't need nearly as much
surface at it has. I don't know if angling the ailerons is necessary. If you angled
them, it might be beneficial as well.

FBD.
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Old 08-07-2006, 10:14 AM
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Default RE: Ed's Mach Racer

Thanks for the info on the launch system. I was looking for something to get the Combat planes into the air and was considering some kind of drop gear. I like this idea much better. I do not like hand launching[:'(]
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Old 08-07-2006, 10:16 AM
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Default RE: Ed's Mach Racer

Thanks for the info on the launch system. I was looking for something to get the Combat planes into the air and was considering some kind of drop gear. I like this idea much better. I do not like hand launching[:'(]
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Old 08-21-2006, 03:05 PM
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Default RE: Ed's Mach Racer

Hello Ed, mind if I ask what kinds of skins you used and how you installed them?
EDIT: *skids

I just started quickie flying, mainly because my sponsors (mom and dad) thought I'd have endless crashes, but after I flew around on an e-bay quickie (no idea what it is, looks like a viper with a vert. stab.) until its firewall and stabs started breaking out from wear, I got to order a mach racer (should be coming in this week). I took one look at the internet pictures and loved everything but the landing gear.

I've never tried an elevon setup, so is there anything I should look out for when flying a plane with an elevon setup? Is there anything I should look out for specific to the plane itself?

I look forward to your reply, and any other mods you have comming.
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Old 08-22-2006, 01:34 PM
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Default RE: Ed's Mach Racer

hey i was at the local rc airfield recently and saw some very fast delta wing planes flying and have been trying to track down what they were and where to get them, they seemed alot like your mach racer, although different colours, but i was wondering if anyone can point me towards a UK/EU website which sells them as well as any tips on which delta wing plane is a good one to get!
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Old 08-23-2006, 09:57 PM
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Default RE: Ed's Mach Racer

Hi Guys,

Here's a couple of pics of my Mach Racer.

SPECS
Engine : Rossi 45 with Standard Muffler
Prop : APC 9 x 8
Idle RPM : 2,100
Max RPM : 15,600
Running RPM : 15,200
Fuel : Byron 5% Nitro, 16% Oil

Visual speed estimates...straight and level..95++ mph
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Old 08-24-2006, 07:47 AM
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Default RE: Ed's Mach Racer


Flare,

Nice example....

how did it balance out with the Rossi ??
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Old 08-24-2006, 10:52 AM
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Default RE: Ed's Mach Racer

Does anyone know how to get this plane out of a flat spin?

BTW: Don't get this plane into a flat spin!
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Old 08-24-2006, 12:40 PM
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Default RE: Ed's Mach Racer


ORIGINAL: AAbdu

Does anyone know how to get this plane out of a flat spin?

BTW: Don't get this plane into a flat spin!
It will get itself out of a flat spin....

....when is strikes the Earth.
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