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ProModeler Scorpion Power
Gearhead

rrMaster

Vt

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Watch at YouTube

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Jim
Buzz Buzz Buzz

11-12-2016 06:16 AM
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rbort

rrProfessor

Franklin, MA - USA

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To be honest

The motor sounds terrible...

And what sort of head speed is he running, doesn't even look like its much more than 1500 per the video.

-=>Raja.

MA 1005 H280, 4058 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3139 flts
Whiplash V1 27 3DMax, 1317 flts
Whiplash V2 H300, 42 flts

11-12-2016 06:22 AM
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kogibankole

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albuquerque/ibadan

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fantastic job !

good job converting it, looks good to me!

if im not blade bogging youll find me pack puffing

11-12-2016 01:07 PM
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xcellgasman101

Elite Veteran

WOODWARD, OKLA....

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Nice job on the conversion!!! but I have to agree,,,, the engine sounds a little fat and Head speed sound way too low. Still cool!! XGM/VGM

John Crotts
www.soonerhelicamproductions.com

11-12-2016 01:15 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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The motor sounds terrible...
yeah... agree 100%

flying circuits doesnt prove anything other than it can fly... performance wise, Im not sure its got the balls to do anything other than fly just circuits. I have seen enough videos of sub 20cc engines in 600 class birds trying "mild" 3D and they just didnt cut it, bogging, overheating, and generally liberal temper tantrums when pushed into any sort of collective load.

I applaud his hard work, but as the old saying goes there is no replacement for displacement

showing a preference will only get you into trouble, 90% of everything is crap...

11-12-2016 01:18 PM
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BeltFedBrowning

Key Veteran

USA

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That is awesome! I don't mind the sound. A great powerplant for a low head speed machine.

perfer et obdura; dolor hic tibi proderit olim

11-12-2016 01:27 PM
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rbort

rrProfessor

Franklin, MA - USA

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Don't get me wrong

By terrible I mean the motor does not sound happy. It may be so rich because the cooling is insufficient and if run up to normal rpms it will build too much heat like the OP says.

The other issue you have is that little nitro motors don't have the reliability of the bigger workhorse gas engines. Its a cool project and nice efforts to make it run on gas

-=>Raja.

MA 1005 H280, 4058 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3139 flts
Whiplash V1 27 3DMax, 1317 flts
Whiplash V2 H300, 42 flts

11-12-2016 04:14 PM
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Gearhead

rrMaster

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hey, I say, if he is happy with it why knock it, besides, it would be ok for scale

Jim
Buzz Buzz Buzz

11-13-2016 02:28 AM
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RM3

Elite Veteran

Killeen, Texas - USA

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I dont know about good for scale.
the scale guys are going predominantly electric because of the sound, the high pitched gear noise is key... no one likes a scale apache AH64 to sound like a cheap used Ryobi weedeater.

he did a great job of getting it to work... but there are alot of things out there that tinkerers have made work, the key to success though is performance and durability. I have yet to see either when it comes to these 10-15cc homemade gassers.

but he is having fun...and AFAIK, thats the whole point.

showing a preference will only get you into trouble, 90% of everything is crap...

11-13-2016 05:37 PM
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kogibankole

Key Veteran

albuquerque/ibadan

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it is through small steps like this and this kind of mindset that add knowledge to the hobby right? maybe this isnt the optinal application for this, but maybe open the door to something else, so def wouldnt knock on it.

if im not blade bogging youll find me pack puffing

11-14-2016 05:19 PM
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CostaRicaHeli

Senior Heliman

Costa Rica, Central America

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Add a water pump run from a belt and a small radiator and get it the cooling it needs. Maybe then you can lean it out and get it running at higher RPMs. Good job!

Franz

11-14-2016 08:55 PM
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Luis104

Senior Heliman

Caracas / Venezuela

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great job

it´s a nitro conversion to gasser. obviously it will sound different.

it can fly!!! cheap flights!!! great!!!

02-13-2017 12:08 AM
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Gearhead

rrMaster

Vt

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Luis104

I'm glad you like it,, know what I am thinking, how about a 120 2St glow converted for a plane (warbird)

Jim
Buzz Buzz Buzz

02-13-2017 01:59 AM
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jharkin

Senior Heliman

Holliston, MA - USA

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Conversions always have issues with insufficient cooling, tuning problems trying to make a glow carb work on gas (the taper on a glow needle is too coarse for gas fine tuning) and needing a lot of oil because of the lack of needle bearings on the conrod.

Water cooling is not the easy fix it sounds like, as the size of the radiator you need is a lot bigger than you think.

No need to convert a 1.20 2 stroke to gas for a plane, there are dozens of high quality 20cc to 30cc dedicated gas engines that have walbro carbs and full bearing cranks that work really well and will drop into most quarter scale planes.

G26, DLE-20, DLE-30RA, DA-35, O.S. GT22 and GT33, and so on.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

02-13-2017 03:33 PM
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Gearhead

rrMaster

Vt

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No need
what

fun is need enough
there are dozens of high quality 20cc
yee-up, I have 2, a Z G20 and an old Super Tartan 22cc Meth Engine

Jim
Buzz Buzz Buzz

02-16-2017 02:49 AM
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tommytt1

Veteran

Mercerville, NJ, USA

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I like the effort and they have it flying consistently. Great job !

Gaui has a gas engine for the NX4 that a .37 is the normal engine. The gas engine is .50 size, so maybe the engine in the video would be benefit from a displacement increase.

I made a mistake once, but I was wrong?

02-16-2017 12:48 PM
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