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Tuchop
Gemini
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Posted: April 23 2005,9:55 am |
Post # 1 |
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I got this site the other day. Prop slip is usually no lower than 9%. 13% to 16% is prob more realistic. Parental Advisory: This could hurt your feelings if you have never GPSd your ride.
http://www.rbbi.com/folders/prop/propcalc.htm
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| Member # 1336 | Joined: 4-20-2005 | |
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shueman
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Posted: April 23 2005,6:09 pm |
Post # 2 |
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Waaaayyy to tech 4 me...my GPS does good enough...
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GoFastRacer
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Posted: April 23 2005,9:35 pm |
Post # 3 |
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I seen that before and it don't make sense at all, I put in my combination when I ran 106 and this deal says 75, something's wrong with that deal!..
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Tuchop
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Posted: April 26 2005,7:54 pm |
Post # 4 |
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GFR, I am not familiar w/ v-drives is there a gear or is it strt 1:1 drive ratio.
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Tuchop
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Posted: April 27 2005,3:11 pm |
Post # 7 |
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Quote (Havasu Doug @ April 27 2005,8:47 am) | Tuchop, this is a pretty cool avatar BTW.
I'm going to put it in the random pic place on my main site. |
Thanks, Hendrix was the man!!
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| Member # 1336 | Joined: 4-20-2005 | |
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GoFastRacer
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Posted: May 03 2005,6:08 am |
Post # 11 |
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Quote (Tuchop @ April 26 2005,8:54 pm) | GFR, I am not familiar w/ v-drives is there a gear or is it strt 1:1 drive ratio. |
You can get 1:1 all the way to 2.00 to meet your horsepower and prop combo!..I'm running 18's now but I should use 15's with this POS motor I have now!.
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| Member # 101 | Joined: 3-03-2003 | |
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Tuchop
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Posted: May 03 2005,6:38 pm |
Post # 16 |
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I went out and bought a GPS. I think that program is close for me but, I damn sure wouldn't complain if it GPSd better. A couple more weeks and I'll check it out
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| Member # 1336 | Joined: 4-20-2005 | |
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Tuchop
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Posted: May 03 2005,6:44 pm |
Post # 17 |
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Quote (AzMandella @ May 03 2005,5:59 pm) | Quote (AZKC @ May 03 2005,5:54 pm) | I thought you said it was fast enough |
I don't remember saying it was fast enough,but as usual with roller cams they tend to quit building torque in the 6500 to 7000 range and with the 22's I can keep it in the power band.RPM's are great but torque is what helps acceleration and lift and with a heavy hull like a Mandella I need it.WE had it on the GPS this weekend for the first time and was 93 MPH.With the 22's I feel 100 is very attainable.I'm also going to try some different prop pitches and profiles to see if I can get rid of the looseness,It's a little squirly on acceleration but not when it reaches speed. |
AZmandella, Does 93mph have ur undivided attention or what?? Does that thing ever feel like its gonna go over on its lid?? I have only been up to about 70 give or take a lie.
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GoFastRacer
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Posted: May 04 2005,5:50 am |
Post # 18 |
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Quote (AzMandella @ May 03 2005,5:36 pm) | Quote (GoFastRacer @ May 03 2005,7:08 am) | Quote (Tuchop @ April 26 2005,8:54 pm) | GFR, I am not familiar w/ v-drives is there a gear or is it strt 1:1 drive ratio. |
You can get 1:1 all the way to 2.00 to meet your horsepower and prop combo!..I'm running 18's now but I should use 15's with this POS motor I have now!. Â |
15's? It seems to me that even that POS motor as you call it is building enough HP and torque to pull 18's.What size and pitch prop are you running?I'm running 18's and need to go to 22's with my new motor. |
Nope it ain't pulling the gears, I'm only turning 6400, actually 12's would be more ideal. That motor needs a set of pistons to bring up the compression, my other motor(440) pulled 7500 with the 18', with 11 1/2x14 prop!.
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| Member # 101 | Joined: 3-03-2003 | |
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GoFastRacer
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Posted: May 04 2005,6:00 am |
Post # 19 |
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Quote (AzMandella @ May 03 2005,6:50 pm) | I'll bet that calculator is for 3 blade props.And all the speed calculators I have seen also ask prop diameter.I know that that one is not right.I'm getting 650+ HP and turning 18's with a 11-1/2 x 15 prop at 7000 and I know I'm going faster than 76 MPH |
Depending on prop slip with that combination you were going 93.8 with 20% slip!.
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| Member # 101 | Joined: 3-03-2003 | |
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GoFastRacer
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Posted: May 04 2005,1:46 pm |
Post # 22 |
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I have an Excel file that really works good and is very accurate!..
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| Member # 101 | Joined: 3-03-2003 | |
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GoFastRacer
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Posted: May 04 2005,1:49 pm |
Post # 23 |
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Quote (AzMandella @ May 04 2005,11:24 am) | It doesn't feel like it's going to go over on it's lid but it is a little loose side to side on acceleration.Once it reaches top speed it sets better. |
Not mine, you don't even hardly have to hang on to the wheel on acceleration!.
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| Member # 101 | Joined: 3-03-2003 | |
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