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Feb 01, 2006, 09:46 PM
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need help with BUMP


ok so heres the specs
BUMP built from plans out of depron
auw 19 grams
motor SS red DD gws 2510
rx chariot car
batt 145

the problem is when i try flying it doesnt rise it just goes into a straight glide then dives ive messed around with the cog/downthrust and no avail

and if someone could tell me how to post pics ill put some of it thanx
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Feb 01, 2006, 10:02 PM
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caseyjholmes's Avatar
whats the wingspan and chord? (length and width?)
Feb 01, 2006, 10:04 PM
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its 16 w and 3 chord
Feb 01, 2006, 10:18 PM
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caseyjholmes's Avatar
you should be fine weight wise =)
try balancing the plane back a bit more with some weight on the tail in tiny incraments. See if this helps any. What about playing with different props?
Feb 01, 2006, 10:20 PM
a little kid at heart
poulsbobill's Avatar
Quote:
Originally Posted by lilpnoytonton
ok so heres the specs
BUMP built from plans out of depron
auw 19 grams
motor SS red DD gws 2510
rx chariot car
batt 145

the problem is when i try flying it doesnt rise it just goes into a straight glide then dives ive messed around with the cog/downthrust and no avail

and if someone could tell me how to post pics ill put some of it thanx
Did you do a fet change on the transistors?...if not then the motor isnt getting enough power (amps) so you are not getting enough thrust. As i recall that motor and prop combo gets about 12 grams of thrust , should be enough thrust unless you built her real draggy.

Bill
Feb 01, 2006, 10:23 PM
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To post pics just scroll down to MANAGE ATTACHMENTS. It is pretty easy from there.

Lets see some pics. Im thinking of building a bump!
Tony
Feb 01, 2006, 10:24 PM
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no fet needed on the chariot atleast thats what ive been told
Feb 01, 2006, 10:26 PM
Registered User
Fet?
Feb 01, 2006, 10:47 PM
Registered User
well ill try with the diffrent props and weight and if that doesnt work im going to move on to my corsair build
specs
depron/ plans from free flight
motor/gearbox/prop SS geared 4:1 gws 5'3
rx chariot
batt 145

hope this one works
Feb 01, 2006, 10:49 PM
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caseyjholmes's Avatar
Quote:
Originally Posted by Tshires
Fet?
High speed/power switching transistor pulsed with PWM from an MCU to drive a motor in variable speeds =)
aka Electronic Speed Control (esc) for smaller sized models
Feb 01, 2006, 11:08 PM
Registered User
OK so now I know what it does. Thanks!

Uhhmm does a Raiedentech chariot bit car guts need one to be used for this application?

Its the stunt car model with the spinning front end.
Feb 01, 2006, 11:13 PM
Registered User
raidentech is currently on backorder i just ordered some from a fellow forumer =)
Feb 01, 2006, 11:17 PM
Registered User
Yep! Thats the ones I have a whole case of them. I am going to use them for projects for my CAD/CAM high school students. A step up from the mouse trap race cars we just finished.

Anyway, Nice pics! Glad you got it figured out.

Do you think 16 year olds could make a bump?
Feb 01, 2006, 11:20 PM
Registered User
well i can speak from experiance because im 16 and that would be great for a CAD class took two years of it built robots/hovercrafts out of plans i drew on CAD


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