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  #31  
Old 03-02-2014, 06:59 PM
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Earl Earl is offline
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Quote:
Originally Posted by hcmbanjo
The old "fly or display" Vostok had two recommended MPC engines
The C6-4 and C9-3
MPC made a C6-4. I never saw a C9-3.
I would think an Estes C6-3 would be fine for a low altitude flight.
(Don't use a Quest C6-3 in this one . . .)
Jeff Lane did a review with flight results on RocketReviews.com:
http://www.rocketreviews.com/mpc-vo...-jeff-lane.html


Thanks for the pointer on Jeff's review. He reports a 300 foot flight on the Vostock with a C6 which is a fair amount more than I would have thought.

GH alludes to the Titan IIIc in his comments....seems like it would weigh in even more maybe. I've got both of the original issue kits, but have always wondered how they would perform with 18mm C's.

Sounds like from what people are saying though, it's stuffing a decent recovery system in the tube and getting it out reliably that may be the real concern.

Earl
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  #32  
Old 03-02-2014, 07:20 PM
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Hi Earl,

Would it be possible to post the fin patterns for the Titan IIIc . I have a feeling this one is going to be a hard one to get in the air.

Thanks.
Frank.
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  #33  
Old 03-02-2014, 07:42 PM
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Quote:
Originally Posted by the mole
Would it be possible to post the fin patterns for the Titan IIIc . I have a feeling this one is going to be a hard one to get in the air.



In the meantime, here are the pictures, before they disappear, from the auction listing which include the fins:


Bill
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  #34  
Old 03-02-2014, 09:13 PM
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Quote:
Originally Posted by the mole
Hi Earl,

Would it be possible to post the fin patterns for the Titan IIIc . I have a feeling this one is going to be a hard one to get in the air.

Thanks.
Frank.


Frank -

Give me a day or two to pull kits out and do some scans. I think I have one IIIc opened, but not sure.


Earl
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  #35  
Old 03-03-2014, 06:45 AM
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Quote:
Originally Posted by Earl
How do you think a C6 would do in this bird? I have a couple of the originals that I had intended on building at least one, but not sure how a standard C6-3 will fair with one of these. I don't recall off hand what the flight-ready weight would be.

Seems Fred mentioned that the never-issued MPC C9 was supposed to have been for these two plastic kits. I never knew anyone who had one of these kits back in the day or reports of flights on other motors.

Earl
If these were flown off a piston launcher (which is admittedly a somewhat finicky and tricky launcher to use), the extra boost might enable Estes (but probably not Quest) C6-3s to get them high enough for "non-cliff-hanger" recoveries, and the models' faster initial motion would help their stability.
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  #36  
Old 03-03-2014, 06:55 AM
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Quote:
Originally Posted by Earl
Thanks for the pointer on Jeff's review. He reports a 300 foot flight on the Vostock with a C6 which is a fair amount more than I would have thought.

GH alludes to the Titan IIIc in his comments....seems like it would weigh in even more maybe. I've got both of the original issue kits, but have always wondered how they would perform with 18mm C's.

Sounds like from what people are saying though, it's stuffing a decent recovery system in the tube and getting it out reliably that may be the real concern.

Earl
"Stream-o-chutes" might be a solution to the limited parachute space problem. A stream-o-chute is essentially a ribbon parachute made with just two strips of fabric, sheet plastic, or mylar, which cross each other in the middle at a 90 degree angle. Two plastic, fabric, or mylar streamers can be used to make one. It can also be made from just one sheet of metallized mylar, with the corners between the "arms" being radiused in order to prevent the mylar from tearing at the 90 degree corners. The "arms" (to whose free ends the shroud lines are attached, one or two lines per "arm") can be made as long as is necessary, to produce the desired amount of drag.
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http://www.lulu.com/product/cd/what...of-2%29/6126511
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  #37  
Old 03-03-2014, 07:46 PM
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Quote:
Originally Posted by Earl
Frank -

Give me a day or two to pull kits out and do some scans. I think I have one IIIc opened, but not sure.


Earl


Found the open IIIc kit.....fins were there still in sealed packet. Will try to post scans later tonight if possible.

Earl
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  #38  
Old 03-03-2014, 11:36 PM
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This might be of some interest
https://www.youtube.com/watch?v=S3W7TXZfbig
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  #39  
Old 03-04-2014, 06:49 PM
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Default Titan IIIc plastic fin scans

Ok, here are the fin scans from a vintage Titan IIIc kit. I was able to pull the kit out last night, but could not get around to scanning until tonight.

The root edge of the top two fins (the two that look like 'standard' type fin designs) is right on two inches long.

Plastic is decently thick....not quite an 1/8th, but thicker than a 1/16th.....maybe 3/32 or so.


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  #40  
Old 03-04-2014, 07:56 PM
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Thanks Earl,
That was the missing pieces to te puzzle.

Was the weight for the Titan IIIc the same as what was in the Vostok?
Thanks again.
Frank.
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