Alright Gang,
Now that I am back from travel for work, I can give you some info on a couple of runs I did on my MC.
For starters, both runs were on 4S2P 4200’s. The strut was set to the factory settings and never changed.
I started with an Octura X440/3, this is the same prop that I ran on the prototype version of the MC all summer last year. I knew starting with prop what to expect. On this run I ran the boat for just over 5min. It was long than I thought and I WOULD NOT advise someone to run their MC this long with the X440/3. The batteries, motor, and controller came in hotter than I like at low 120’s. I prefer to keep things under 110*. The boat was running rock solid. The wind was pretty gusts nearing 20mph. I honestly expected to boat to be loose and flighty, but it never happen. Even when driving into a head wind. I am still working with the Eagle Tree System, so I am not going to post my graphs until they are visibly easier to read. On this run I was pulling in the upper 60 amp rage with a mid to low 40’s speed. Remember this speed was maintained over 5+ minutes. Towards the end of the run I was trying to get the boat to roll onto itself, buy doing an extremely tight and elongated figure 8. The only thing the boat did was spin out once. Otherwise, it would handle the tight turns and instant acceleration fine. I was surprised and happy all at the same time. Oh yeah, I forgot the battery position on this run. I ran the packs as far forward as possible, up to the motor mount.
The second run was with an ABC 45X55 (similar to the GrimRacer 42X55 only a tad larger diameter). I also moved the CG of the boat back by .75” from the first run by moving the batteries back in the boat. This run was just over 3 minutes. The boat was running a little lighter and with a little more speed. Even though this run the boat was running a little more lose, it didn’t have any indication of blowing off. I expect that I will be running this prop for Offshore heat racing. Temps were still a little higher than I like, but I feel that some prop work will help this. This 45X55 prop can be thinned and sharpened a little better. I may even remove some of the tongue. The temp on the motor and controller were in the low 120’s again, and the batteries were low 110’s. The speed increased slightly into the mid to high 40’s (47 mph max). My amp draw did go up slightly into the low 70’s.
I am really pleased with the first two runs. I have some work to do getting the temps and the amp draw a little lower.
Have Fun
Mike
Reply With Quote
) but a guess none the less to (make you go faster?)
Originally Posted by pistol18
Bookmarks