RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 652 views POST REPLY
HomeAircraftHelicopter
e-
Align
Other › TRex 400 size?
02-08-2006 06:40 AM  12 years agoPost 1
spork

rrVeteran

Mountain View, CA

My Posts: All  Forum  Topic

I've been flying the T-Rex for about 3 months now and have a pretty dumb question. I gather it's a "400 size" heli. What makes it a 400 size? Is it the size of the motor (as in Speed 400)?

Try and go easy on me

Thanks.

RC

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-08-2006 06:42 AM  12 years agoPost 2
valerko

rrVeteran

ny,dutches county

My Posts: All  Forum  Topic

Is it the size of the motor (as in "Speed 400"?

Bingo!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-08-2006 06:58 AM  12 years agoPost 3
spork

rrVeteran

Mountain View, CA

My Posts: All  Forum  Topic

Thanks. But I guess that leads me to what may be a dumber question. What's "400" about a 400 motor? I understand how they size nitro motors by displacement in cubic inches, but the 400 is a mystery to me.

I have an old speed 400 here that measures very roughly 40 mm in length (significantly less in diameter). This can't be it - can it?

RC

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-08-2006 07:07 AM  12 years agoPost 4
larsen

rrNovice

Hamburg, Germany

My Posts: All  Forum  Topic

it is the lenght of the motor, i.e. 400 is 40mm or 4cm long.

cold here in germany

PM  EMAIL  Attn:RR  Quote
02-08-2006 12:20 PM  12 years agoPost 5
nocontrol

rrVeteran

Cape Town, South Africa

My Posts: All  Forum  Topic

spork - Here are a few more questions that can be clasified as dumb - but I would like the answer. If I get the answer I will be a little less dumb, but still dumb

1. Lets say somebody makes a 40mm motor as strong as an ?? 80mm ?? motor. Will the heli then be called a 800 or still a 400?
2. A T-rex with a ?? 60mm ?? motor in it - is it a 600 even if the blades and boom are the same length
3. ... a Raptor 50 with a 91 in it but still 600mm blades is it a small 90 or a 50 with a big motor.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
02-08-2006 01:14 PM  12 years agoPost 6
str8den

rrVeteran

NE U.K

My Posts: All  Forum  Topic

i've often wandered how they class these things too; but don't they call the t-rex a 450??
if a 400 motor is 4cm long, how come is there an align 400lf and a 400sf, the sf being a 'shorter' can than the lf (s = short, l = long) and why is my 420lf the same lenght as my 400?

PM  EMAIL  GALLERY  Attn:RR  Quote
02-08-2006 04:01 PM  12 years agoPost 7
RV-4Mike

rrApprentice

San Diego, Ca.

My Posts: All  Forum  Topic

Here's my guess. Speed 400 had a lot more meaning in the early days of electric RC. Not so many choices in motors as there are today. In those days the next step up in size was a significant jump. Kinda like going from a .30 to a .50 in a nitro machine.

The meaning gets lost with the proliforation of motor choices today. When the Trex came out the clear competition was the Shogun which was sold as a 400 class heli. I'd bet the Align marketing department labeled the Trex as a 450 to denote it as slightly larger/bigger/badder than the Shogun.

PM  EMAIL  Attn:RR  Quote
02-08-2006 04:58 PM  12 years agoPost 8
spork

rrVeteran

Mountain View, CA

My Posts: All  Forum  Topic

First, I'm glad to see that I'm in such good company with other dummies

I suspect RV-4Mike is exactly right on all counts. However, it's still curious whether the 400 related to a dimension of the motor, or some power rating relative to a similar nitro motor (e.g an .049), or something else?

We may never know

RC

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 652 views POST REPLY
HomeAircraftHelicopter
e-
Align
Other › TRex 400 size?
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Sunday, June 24 - 5:54 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online