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Old Sep 16, 2012, 10:46 AM
pugsam is offline
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LiPo-Sucker & Airframe EMT
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Quote:
Originally Posted by RealGambler View Post
Hmmmm, is there such a thing as a Mig with snow skis (full scale?). Though, I also agree, would not be too good if that vacuum would suck in some snow... Well, I guess I'll store my Mig for the winter and use my other airplanes!
Yah, it's hard to put a jet fighter on snow skis.

The Soviets did put them on other types, though, and the USN tested a jet with water skis.

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Old Sep 16, 2012, 10:56 AM
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Originally Posted by turboparker View Post
ROG = Rise Off Ground
ROS = Rise Off Snow
ROW = Rise Off Water
Joel
Could you say this is ROD (dirt) or ROS (sand)?

Old Sep 16, 2012, 11:23 AM
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Women Fly Too
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Sorry about that, We don't get much snow in the desert, so I guess I was fixated on what we have a lot of, sand.
The model certainly looks like it has the power to ROG, so snow should be easy if packed. Take out something to flatten a small runway and do it.
Old Sep 16, 2012, 12:05 PM
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My head hurts...


Quote:
Originally Posted by turboparker View Post
Speaking of snow....I wonder how the MiG would handle ROS takeoffs & belly-landings. I'm thinking that the fan would probably ingest a bit of the white stuff on the takeoff run.

Joel
Quote:
Originally Posted by SilentPilot View Post
Thought ROS was Roll On Snow, not Sand
Quote:
Originally Posted by turboparker View Post
Crash & SP,

ROG = Rise Off Ground
ROS = Rise Off Snow
ROW = Rise Off Water
I'm proper confused now!!!
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Old Sep 16, 2012, 01:57 PM
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Quote:
Originally Posted by pugsam View Post
Could you say this is ROD (dirt) or ROS (sand)?

Quote:
Originally Posted by CrashCaley View Post
Sorry about that, We don't get much snow in the desert, so I guess I was fixated on what we have a lot of, sand.
The model certainly looks like it has the power to ROG, so snow should be easy if packed. Take out something to flatten a small runway and do it.
Quote:
Originally Posted by SilentPilot View Post
I'm proper confused now!!!
Dave,

I'd call that SDEIOT. Sanding Down Engine Internals On Takeoff. It is amazing how much punishment the P&W R2800 could take. It was designed to operate @190% rated power continuously for over 100 hours non-stop. P-47 crew chiefs often cranked the turbo up to 150" Hg of manifold pressure. That's nearly 60 pounds (psig) of boost ! Modern TF dragsters only run around 35 pounds of boost.

Crash,

LOL! Yeah, I guess snow would not be the first thing you'd think of down there! Packing the snow down first is a great idea. I hadn't thought of that yet, and they say we only have two seasons in Minnesota - winter & road repair! That's pretty darn good for someone who lives where ROS means Rise off Sand! (Sorry - I just couldn't resist.) Regarding the power - in one of the demo videos, a factory pilot did a ROG belly takeoff on grass. I think it was at SEFF. Looked like there was plenty of power for that, so ROS shouldn't be a problem power-wise. However, my experience with driving on frozen lakes & in extreme winter conditions, and what happens when you hit tall snowdrifts with a car or truck at, say, 25 MPH or more tells me that a screw-up during the takeoff or landing will likely pack the air duct full of snow all the way back to the outlet. I can't even count the number of times I've seen the entire front-end of a vehicle completely snow-packed from the radiator to the firewall - with just enough room for the belts & fan to keep turning (or sometimes not.) I suppose one could hang the MiG vertically over the sink & use a hairdryer to 'deice' the plane....

SP,

Don't worry. You'll get some of that around here, on occasion.

Joel
Last edited by turboparker; Sep 16, 2012 at 02:13 PM.
Old Sep 16, 2012, 02:53 PM
19000rpm is online now
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Quote:
Originally Posted by pugsam View Post
Yah, it's hard to put a jet fighter on snow skis.

The Soviets did put them on other types, though, and the USN tested a jet with water skis.

Yep, that's a Delta Sea Dart. Didn't work out too well since it need very calm water for take offs. There's some video on Youtube of the testing on San Diego Bay.

Coincidentally, many years later, I got stuck behind one that was on the back of a truck going up I10 being transported to its new owner. You talk about tying up traffic. The driver was doing like 30mph for 2 hr's.
Old Sep 16, 2012, 03:41 PM
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pǝʇɹǝʌuᴉ sɐʍ I ǝsnɐɔǝq
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Nosewheel problems... fixed!!!


So before I fly the mig the first time, I taxi it down the diveway, and it pops upoff the ground unexpectedly, and then has a rather hard landing... the nosewheel assembaly breaks off. I made a new one with a paperclip, and It has held up for a few months where the stock one lasted a few seconds. It just bends backwards instead of breaking.
Old Sep 16, 2012, 04:14 PM
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You've been beat to that!!!
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Old Sep 16, 2012, 06:27 PM
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pǝʇɹǝʌuᴉ sɐʍ I ǝsnɐɔǝq
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Quote:
Originally Posted by SilentPilot View Post
You've been beat to that!!!
Dang it... But I did this back when it first came out... so i was first i figure
ah well who cares
Old Sep 16, 2012, 07:07 PM
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Yeah, who cares?
After all, great minds think alike!
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Old Sep 16, 2012, 08:20 PM
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Quote:
Originally Posted by turboparker View Post
Looking forward to testing the new Hyp 35c VX packs in the MiG! What a great time it is to be in this hobby!

Joel
Joel, Be wary of that nose weight. Those new VX packs even when "Babbelbattized" are still almost the same weight as the 3S 320 I tested out. On mine I really needed quite a bit of elevator to keep her level. Landings were quite fast too, even at full elevator high rates. I'm looking forward to seeing how they perform.

-Brian
Old Sep 16, 2012, 09:01 PM
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Quote:
Originally Posted by kalmon View Post
Joel, Be wary of that nose weight. Those new VX packs even when "Babbelbattized" are still almost the same weight as the 3S 320 I tested out. On mine I really needed quite a bit of elevator to keep her level. Landings were quite fast too, even at full elevator high rates. I'm looking forward to seeing how they perform.

-Brian
Brian,

I was thinking about that. Can't remember who posted the mod, but I'm thinking about routing out the belly so I can flush-mount the packs horizontally, and extending the mounting area further aft so I can still get the CG right with the larger packs. 4-minute flights just aren't long enough for me.

Joel
Last edited by turboparker; Sep 17, 2012 at 01:29 AM. Reason: Typo
Old Sep 16, 2012, 11:39 PM
tracknoob is offline
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Diverted by planks
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Bought a little 30mm F-4 at the RC flea market today for $10 !

It was airframe only, meaning had the fan but no motor, but here's the kicker: the guy had spare motors for.... a buck!

Needless to say, between me and my buddy, we gobbled whatever he had on hand, not even sure what KV or other particulars are... I grabbed three myself -- will check it out later to see if it is a suitable replacement for the Mig's ailing powerplant. At a buck a pop, it was worth grabbing them even if they are wrong KV. The can size and length looks right by eyeballing it.

If it works, then I'll provide pics, and any brand/size/part number info that is on them.
Old Sep 16, 2012, 11:47 PM
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The Earth got in the way!
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Wouldn't happen to look like this would it. When 2Dog first got these they were 30mm.
http://www.hobbyking.com/hobbyking/s...ss_motor_.html
Old Sep 17, 2012, 12:03 AM
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Diverted by planks
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Originally Posted by kuczy View Post
Wouldn't happen to look like this would it. When 2Dog first got these they were 30mm.
http://www.hobbyking.com/hobbyking/s...ss_motor_.html
That's the critter!

And I pulled the motors to take a peek at the label. Here is what they are -- looks like we got a one-time good price, but they are wrong KV for the Mig, UNLESS you want to go to more fan blades and 3S....


Quote:
Feigao 1208425 Brushless Motor

$32.99
Feigao 1208425 Brushless Motor (0.6 oz, 17.0 g)
Specifications:

Model: 1208425L
Windings: 25 Turns
Max Current: 5.5 A
Resistance: 0.316 Ohm
Kv: 5866 RPM/V
Io: 0.6 A
Shaft Size: 1.5 mm Diameter, 6.0 mm Length
Weight: 17 g ( 0.6 oz)
Dimensions: 12.0 mm Diameter x 31.0 mm Length

Recommended ESC: Castle Creations Phoenix 10

MIG-15 motor specs:

Quote:
E-flite BL180m Ducted Fan Motor, 11750Kv

E-flite's BL180m DF Brushless Motor is an ideal choice for products such as E-flite’s UMX MiG 15 and other similar-sized ducted fan airplanes when using the purpose-built Delta-V 180m 28mm EDF (EFLDF180m).

The motor will provide great performance in 28mm diameter fan units requiring a 10mm inrunner motor.

Product Code: EFLM30180MDFA


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