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Old 10-16-2016, 08:21 PM   #61
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Re: The Boomerang Sprint Club


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Originally Posted by DHC8 View Post
Brent,

A little extra power you said... LOL.... A JC Rabit... You say... LOL. Howbout a Cheetah? I took the Cheetah out of my Hawk and it will be in my Sprint, so it should move along ok... LOL.
Yeah, that will provide some fun!

I have a Merlin 140xbl kicking around, but I figured that it would rip apart that airframe if I opened it up! Verticals will be awesome with that weight ratio!! Got a Cheetah in my Ultra Flash and it has great verticals with more weight than a Sprint.
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Old 10-16-2016, 08:31 PM   #62
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Re: The Boomerang Sprint Club

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Originally Posted by excelsiuss View Post
lol.. Ok my bad. There Behotec struts for the C-36 retracts on Peters site.
http://www.altecare.com/struts.htm

These puppies are Heavy Duty and it will be a very long time before they wear.

The Prolinks are all sideloaded(an incredibly poor design, but one that will ensure you keep coming back to them each season ) The twisting and turning is not good for any part of the strut. The knee is to short(the part where the strut bends)more so the area where the pin goes threw, will wear quickly!. The springs are a bit weak and lose their resilience after time. I wear out a pair of prolinks each season, and let me tell you, I land like a butterfly with sore feet
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Originally Posted by pylonboy View Post
Yeah, that will provide some fun!

I have a Merlin 140xbl kicking around, but I figured that it would rip apart that airframe if I opened it up! Verticals will be awesome with that weight ratio!! Got a Cheetah in my Ultra Flash and it has great verticals with more weight than a Sprint.
If you wanted a little more zip/vertices the JM 100 would be a great choice. Only grams heavier than the VT80 but 4 lbs more thrust. From what I have picked up is that Jets Munt rate their turbines with max thrust numbers being minimum thrust , saying they guarantee that thrust ie vt80 at 18 lbs and do in. Also Boomerang states not to use higher than recommended ; you do so at your own risk.

Peter m your pic on the air retracts are those prolink air ? Or another brand.
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Old 10-17-2016, 07:20 AM   #63
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Re: The Boomerang Sprint Club

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Yeah, that will provide some fun!

I have a Merlin 140xbl kicking around, but I figured that it would rip apart that airframe if I opened it up! Verticals will be awesome with that weight ratio!! Got a Cheetah in my Ultra Flash and it has great verticals with more weight than a Sprint.
So far it seems to be holding up good with the cheetah. 316kph!! Vertices are awesome! Take off, suck the gear, retract the flaps, and pull!!!!
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Old 10-17-2016, 08:27 AM   #64
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Re: The Boomerang Sprint Club

That is awesome!!! Sounds just about perfect!!

I have a JC Rabbit in mine and it has loads of power and awesome vertical, but could definitely use a bit more uuuummppphh!! A good 140 sounds ideal
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Old 10-18-2016, 10:39 PM   #65
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Re: The Boomerang Sprint Club

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Mike , You used 7955 for the rudders as well ? Wow those are heavy ! what turbine did you use and how much weight up front ?
Don't know about weight distribution yet. Still waiting on retracts. I'll install the tail servos last to see how things work out. Maybe go with smaller servos in the tail.
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Old 10-18-2016, 11:24 PM   #66
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Re: The Boomerang Sprint Club

Sounds like a good plan.
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Old 10-20-2016, 07:45 PM   #67
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Re: The Boomerang Sprint Club

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Originally Posted by stegl View Post

Peter m your pic on the air retracts are those prolink air ? Or another brand.
Here is a side by side comparison. The skinny and weak looking struts are the Prolinks.

Note how ALL the load is on the side of the Prolink strut. This causes great torsion, twisting and cambering, quickly wearing out the knee parts. Ive had the gear fall apart on take off at least 2 times!
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Old 10-20-2016, 07:54 PM   #68
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Re: The Boomerang Sprint Club

Thanks Peter. I can certainly see your point . not sure if you mentioned.. what are the
strut brand you have there using a compression spring ?
Thanks.
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Old 10-20-2016, 08:01 PM   #69
excelsiuss
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Re: The Boomerang Sprint Club

Those are the Behotec

Prolink on the Left of the Picture and Behotec on the right. The ProLink on the left(with the very visible Tension Spring)
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Old 10-20-2016, 09:54 PM   #70
stegl
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Re: The Boomerang Sprint Club

Can't seem to find any current info on your Behotec retract struts. There is a model 36 that doesn't have a wrap-around frame but doies allow the wheel to be close to the centerline of the strut and uses a compression spring instead of an expansion one.
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